IT14G Integrated Toolcarrier and 914G Wheel Loader Standard Power Train Caterpillar

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Show/hide table

Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak.

Show/hide table

NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

Note: All of the tests use 10W hydraulic oil at a temperature range of 55°C (130°F) to 65°C (150°F).

Ensure that the intake manifold boost pressure is correct before the hydrostatic system is tested. Refer to Technical Information Bulletin, TIBU184326 March 1997, "Inlet Manifold Pressure for Turbocharged 3054 Machine Engines" for the specifications of the intake manifold boost pressure.

The tests for the hydraulic system should be done in the following order. In order for the hydrostatic system to function properly, each component in the system must be set to the correct specifications. Some components must be set prior to the testing of other components. A component that is not set properly will have an impact on other components in the system.

It is not advisable to bypass preceding tests. Do not perform a test before the tests that precede that test have been done. Each test has a chart that lists the equipment that is needed to perform testing on the hydrostatic system. Equivalent tooling may be substituted. You will need additional wrenches, shop equipment and tools. You may need additional fittings. You may substitute additional fitting in the list below.

Clearly mark all of the hoses and the corresponding pressure gauges, when the hoses are installed. The hoses and the pressure gauges will be used multiple times in the testing and adjusting procedures.

Preparing the Machine for Testing

Close the Inching Valve

Many of the following tests require the application of the service brakes in order to prevent movement of the machine. The application of the service brakes causes the signal oil that flows to the pump to flow to the hydraulic tank. This causes hydrostatic braking. Hydrostatic braking causes the motor to upstroke and hydrostatic braking causes the pump to destroke. In order to obtain the correct pressures, the shutoff valve for hydrostatic braking is closed. This will prevent hydrostatic braking when the service brakes are depressed.

(PIN: 9WM1-87; 1WN1-94)

Show/hide table



Illustration 1	g00492429
(1) Linkage. (2) Nut. (3) Stud. (4) Lever.

1. The master cylinder is located under the floor panels and on the left side of the frame. Remove the nut (2) from the stud (3) .

2. Disconnect linkage (1), which connects the inching valve to the master cylinder for the service brakes.

   Note: Rotate the lever (4) fully forward toward the front of the machine. This will prevent the inching valve from actuating during the remainder of the test procedure.

(PIN: 9WM88-1298; 1WN95-898)

Show/hide table



Illustration 2	g00492430
(5) Linkage. (6) Lever.

1. The master cylinder is located under the floor panels and on the left side of the frame. Linkage (5) connects the inching valve to the master cylinder for the service brakes.

2. Disconnect the linkage (5) from the lever (6). The lever is attached by a ball joint with a quick release.

   Note: Rotate the lever (6) fully forward toward the front of the machine. This will prevent the inching valve from actuating during the remainder of the test procedure.

(PIN: 9WM1299-UP; 1WN899-UP)

Show/hide table



Illustration 3	g00474235
Shutoff valve (7) Stem. (8) Shutoff Valve.

1. The shutoff valve is located on the right side of the machine. Raise the engine hood. Prop the hood support.

2. Rotate stem (7) on shutoff valve (8) counterclockwise until the pin on the right side of the shutoff valve prevents further rotation. This blocks the hydraulic oil to the inching valve.

Deactivate the Neutralizer to the Hydrostatic System

When the parking brake is applied, the limit switch on the parking brake control lever will signal the hydrostatic system to neutralize. This procedure will allow the hydrostatic system to ignore the limit switch on the parking brake control lever.

1. Remove the access panel on the lower right side of the machine by the door.

Show/hide table



Illustration 4	g00460744
Location of the Parking Brake Relay and Parking Brake Alarm Relay (9) Parking brake alarm relay. (10) Parking brake relay.

2. Disable the neutralizer to the hydrostatic system by removing the parking brake alarm relay (9) and the parking brake relay (10) .

Show/hide table



Illustration 5	g00460787
Jumper Wire Location (11) Location F3. (12) Location D5.

3. Insert 2G-5298 Wire Assembly into the relay panel at locations F3 (11) and D5 (12) .

Initial Pressure Tests

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Show/hide table

NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

This test checks the engine rpm, the charge pump pressure, the pressure for the cooling loop, the pressure for the pump case, the signal oil pressure, the implement pressure, and the steering pressure. The pressures are recorded, when the engine is at low idle and at high idle. During the test, the machine is in NEUTRAL. This test establishes that the machine can be tested and this test establishes a baseline for the remaining tests.

Table 1

REQUIRED TOOLS
Part Number	Description	Quantity
JEBD3003	Electronic Technician	1
8T-0861	Gauge 0 to 60000 kPa	1
8T-0848	Gauge 0 to 400 kPa	2
8T-0849	Gauge 0 to 2000 kPa	1
8T-0850	Gauge 0 to 4000 kPa	3
6V-3014	Hose Assembly	8
6V-4143	Coupler	16
6V-3989	Unvalved Nipple	8
1U-5481	Gauges	1
1U-5482	Adapter Kit	1

Show/hide table



Illustration 6	g00476048
Removing Batteries and Battery Tray (1) Disconnect Switch. (2) Battery. (3) Two bolts. (4) Bolt. (5) Battery tray.

1. Raise the engine hood. Prop the hood support. Place disconnect switch (1) in the OFF position.

2. Disconnect battery cables. Remove two bolts (3) that are on the front of the battery tray (5). Loosen bolt (4).

   Note: Ensure that there is enough thread engagement on bolt (4) to hold battery tray (5) .

Show/hide table



Illustration 7	g00491817
(5) Battery tray.

3. Rotate the front side of the battery tray (5) in order to access the pump.

Show/hide table



Illustration 8	g00474837
Pressure Tap Locations on the Hydrostatic Pump (6) Pressure tap for the pump case. (7) Pressure tap for the charge pump. (8) Pressure tap for the signal oil pressure.

4. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0848 Pressure Gauge. The pressure gauge has a range of 0 to 400 kPa (0 to 60 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the pump case (6) .

5. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0850 Pressure Gauge. The pressure gauge has a range of 0 to 4000 kPa (0 to 580 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the charge pump (7) .

6. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0850 Pressure Gauge. The pressure gauge has a range of 0 to 4000 kPa (0 to 580 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the signal oil (8) .

Show/hide table



Illustration 9	g00530879
(9) Access plate.

7. Remove access plate (9) .

Show/hide table



Illustration 10	g00490808
Pressure Tap Location for the High Pressure Oil of the Drive Loop (10) Pressure tap for the high pressure oil of the drive loop.

8. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to one 8T-0820 Pressure Gauge. The pressure gauge has a range of 0 to 60000 kPa (0 to 8700 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the high pressure oil of the drive loop (10) .

   Note: This pressure gauge will not be used for this test. This pressure gauge was added for the stall test.

9. Clearly label the hydraulic test lines. Secure the hydraulic lines so that the pressure gauge can be viewed by the operator during the test. Do NOT hold the pressure gauge or the hydraulic line.

Show/hide table



Illustration 11	g00476048
Installing Batteries and Battery Tray (1) Disconnect Switch. (2) Battery. (3) Two bolts. (4) Bolt. (5) Battery tray.

10. Rotate the battery tray (5) into the proper position. Tighten bolts (3) and (4). Ensure that the test hoses are not pinched.

11. Connect the battery cables.

12. Place disconnect switch (1) in the ON position.

Show/hide table



Illustration 12	g00492661
Pressure Tap Location (PIN: 7ZM1-4398ZM1-331) (11) Pressure tap for the cooling loop.

Show/hide table



Illustration 13	g00474831
Pressure Tap Location (PIN: 7ZM440-UP8ZM332-UP) (11) Pressure tap for the cooling loop.

13. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0846 Pressure Gauge. The pressure gauge has a range of 0 to 1000 kPa (0 to 145 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the cooling loop (11) .

Show/hide table



Illustration 14	g00474834
Pressure Tap Location (12) Pressure tap for the implements.

14. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0849 Pressure Gauge. The pressure gauge has a range of 0 to 2000 kPa (0 to 300 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the implements (12) .

    Note: Do not move the implement lever, because the pressure will exceed the maximum pressure of the pressure gauge.

Show/hide table



Illustration 15	g00474835
(PIN: 7ZM1-5998ZM1-499) (13) Pressure tap for steering.

Show/hide table



Illustration 16	g00541646
(PIN: 7ZM600-UP8ZM500-UP) (13) Pressure tap for steering.

15. Install the face seal tee and the nipple assembly (13) .

16. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0850 Pressure Gauge. The pressure gauge has a range of 0 to 4000 kPa (0 to 580 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for steering (13) .

17. Do not move the steering wheel, because the pressure will exceed the maximum pressure of the pressure gauge.

Show/hide table



Illustration 17	g00475023
Location of the Pressure Tap for the Service Brake (front) (14) Pressure tap for the service brake (front).

18. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0848 Pressure Gauge. The pressure gauge has a range of 0 to 400 kPa (0 to 60 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the service brake (14) .

19. Do not apply either service brake pedal, because the pressure will exceed the maximum pressure of the pressure gauge.

20. Clearly label the hydraulic test lines. Secure the hydraulic lines so that the pressure gauge can be viewed by the operator during the test. Do NOT hold the pressure gauge or the hydraulic line.

Show/hide table



Illustration 18	g00475147
Location of the Service Connector If the machine is not equipped with ride control, load check or secondary steering, then an electronic control module and a service connector are not installed.

21. Remove the plate that covers the service connector. The plate is removed in Illustration 18.

22. The engine speed can be checked with the Electronic Technician (ET). ET is a software program that can be used on a personal computer that is IBM-compatible. The 7X-1700 Communication Adapter is required in order to use ET. Use 139-4166 Data Link Cable to plug into the service connector. The service connector is located under the right side of the cab and behind the ladder. The service connector is shown in Illustration 18. Use 7X-1425 Cable to connect from the data link cable to the personal computer.

    1. If ET is not available, then install 8T-8697 Electronic Control Analyzer Programmer (ECAP) to the service connector. To use the ECAP service tool, see Tool Operating Manual, SEH9343. ECAP must have installed at least a Version 1.3 of Machine Functions Dual SPM, NEXG4521.

    2. If the machine does not have a service connector, then install 9U-7400 Multitach in order to check the engine speed.

23. Sit in the seat and fasten the seat belt.

24. Move the direction control lever to the NEUTRAL position. Engage the parking brake.

25. Press the speed select switch in the SLOW position. Do not move the direction control lever from the NEUTRAL position.

26. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

27. Record the engine speed, the charge pump pressure, the signal oil pressure, the pressure for the pump case, the pressure for the cooling loop, the implement pressure, and the steering pressure in Table 2.

28. Increase the engine speed to high idle.

29. Record the engine speed, the charge pump pressure, the signal oil pressure, the pressure for the pump case, the pressure for the cooling loop, the implement pressure, the steering pressure, and the service brake pressure in Table 2.
    Show/hide table

    Table 2

    Initial Pressure Tests
    Test	Low Idle		High Idle
    	Spec	Actual	Spec	Actual
    Engine Speed	1005 ± 25 rpm		2320 ± 50 rpm
    Charge Pressure	2900 ± 200 kPa (420 ± 30 psi)		3150 ± 200 kPa (460 ± 30 psi)
    Signal Oil Pressure	600 ± 200 kPa (90 ± 30 psi)		3100 ± 300 kPa (450 ± 45 psi)
    Pressure for the Pump Case	50 ± 30 kPa (7 ± 4 psi)		135 ± 50 kPa (20 ± 7 psi)
    Pressure for the Cooling Loop	225 ± 150 kPa (33 ± 22 psi)		450 ± 125 kPa (65 ± 20 psi)
    Implement Pressure	500 ± 200 kPa (73 ± 30 psi)		1200 ± 400 kPa (175 ± 60 psi)
    Steering Pressure(PIN: 9WM1-1298, 1WN1-898)	500 ± 200 kPa (75 ± 30 psi)		1100 ± 400 kPa (160 ± 60 psi)
    Steering Pressure (PIN: 9WM1299-UP, 1WN899-UP)	1000 ± 300 kPa (145 ± 45 psi)		1300 ± 400 kPa (190 ± 60 psi)
    Service Brake Pressure			0 to 20 kPa (0 to 3 psi)

30. If the engine speed is not within the specification, then refer to the Systems Operation and Testing and Adjusting, SENR5816 in order to adjust the idle speeds to the correct specifications.

31. Decrease the engine to low idle. Stop the engine.

Note: If the pressures are low in low idle and the pressures are within the specifications in high idle, then this may indicate a leak.

32. If the pressures are within the correct specifications, then go to the next step.

    1. If the cooling pressure is too low, a bypass valve could be improperly assembled. The valve in the return manifold could be stuck open. If the cooling loop pressure is too high, a bypass valve could be stuck in the closed position. Also, there may be a line or a component that is restricted.

    2. If the signal pressure is too low or too high, verify the charge pressure on the gauge that is attached to pressure tap (7). Check the adjustment for the linkage to the inching valve for (PIN: 7ZM1-599, 8ZM1-499). Refer to Systems Operation and Testing and Adjusting, SENR6772-01, "Service Brake Control - Adjust". Check that the inching valve actuates properly for (PIN: 7ZM600-UP, 8ZM500-UP). Refer to Systems Operation and Testing and Adjusting, RENR2810-01, "Inching Valve - Test" for more information. Check the settings for the speed sensing valve. If the valve is not set to the correct specifications, refer to Systems Operation and Testing and Adjusting, SENR6766-02, "Speed Sensing Valve Adjustment" for the correct adjustment procedure. Check the settings for the speed sensing valve at the rated engine speed.

    3. If the pressure to the pump case is too low, check for a leaking lip seal. Check for leaks on the motor case. Check for a flushing valve that is stuck open. If the pump case is too high, check for a restricted line and check for a restricted component.

    4. If the pressure to the charge pump is not correct, the flushing valve may be stuck open or the charge relief valve is out of specification. Refer to Specifications, SENR6765, "Piston Pump (Hydrostatic)" for the specifications for the charge relief valve.

    5. If only the steering pressure is out of specification, then refer to Systems Operation, Testing and Adjusting for the Steering System, SENR6770-01 for (PIN: 7ZM1-599, 8ZM1-499). Refer to Systems Operation, Testing and Adjusting for the Steering System, RENR2814 for (PIN: 7ZM600-UP, 8ZM500-UP).

    6. After making, the proper adjustments repeat the initial pressure tests.

33. Remove the test line for the service brakes (14). Remove the test line for the implements (12). Remove the test line for the steering (13). Leave all the other gauges installed on the machine.

Stall Tests

These tests check the condition of the engine and the hydrostatic systems under a load.

Hydrostatic Stall Test

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

This test checks that the hydrostatic drive is fit for use in a single stall condition. This test also establishes the proper settings for the valve for pressure override.

1. Install chocks around the wheels.

Show/hide table



Illustration 19	g00533087
(1) Bolt.

2. Remove bolt (1) .

Show/hide table



Illustration 20	g00533088
(2) Bolts. (3) Cover for the parking brake.

3. Remove three bolts (2). Remove the cover for the parking brake (3) .

Show/hide table



Illustration 21	g00533089
(4) Nut. (5) Parking brake cable.

4. Disengage the parking brake. Loosen nut (4). Adjust the parking brake cable (5) by tightening the lower nut in order to remove 10 mm (0.40 inch) of cable (5). Fully engage the parking brake.

   Note: The parking brake will remain adjusted during this test, the stall test for the implements, and the hydrostatic stall test and the stall test for the implement system.

5. Remove the chocks around the wheels.

6. Sit in the seat and fasten the seat belt.

7. Move the direction control lever to the NEUTRAL position.

8. Press the speed select switch in the FAST position.

9. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

10. Apply the service brake and hold the service brake.

11. Raise the bucket or the implement off the ground.

Note: The condition of the parking brake and the service brake may allow the machine to drive through the brakes. New brake pads and a new brake drum require a break-in period before the maximum braking capacity can be obtained. This break-in period varies and the period is dependent upon the braking applications.

12. Increase the engine speed to high idle.

    Note: No movement of the machine is allowed. If the machine moves, refer to the Brake Systems Operation, Testing and Adjusting, SENR6772-01 for (PIN: 7ZM1-5998ZM1-499). Refer to the Brake Systems Operation, Testing and Adjusting, RENR2810 for (PIN: 7ZM600-UP8ZM500-UP).

13. Move the direction control lever to the FORWARD position.

Show/hide table

NOTICE
Do not hold the drive pressure for more than 15 seconds.

14. Record the engine speed and the high pressure oil of the drive loop. Release the accelerator pedal.
    Show/hide table

    Table 3

    Hydrostatic Stall Test in FORWARD
    Test	Spec	Actual
    Engine Speed from Initial Pressure Test	2320 ± 50 rpm
    Engine Speed from Step 14
    Engine Lug (Difference in Engine Speed From Initial Pressure Test and Step 14)	40 rpm or less
    High Pressure Oil of the Drive Loop	43000 ± 1000 kPa (6240 ± 150 psi)

15. Calculate the engine lug.

16. The parking brake is still engaged and the service brakes are still applied. Move the direction control lever to the REVERSE position.

17. Increase the engine speed to high idle.

    Note: No movement of the machine is allowed. If the machine moves, refer to the Brake Systems Operation, Testing and Adjusting, SENR6772-01 or to Systems Operation, Testing and Adjusting, RENR2810.

Show/hide table

NOTICE
Do not hold the drive pressure for more than 15 seconds.

18. Record the engine speed and the high pressure oil of the drive loop. Release the accelerator pedal.
    Show/hide table

    Table 4

    Hydrostatic Stall Test in REVERSE
    Test	Spec	Actual
    Engine Speed from Initial Pressure Test	2320 ± 50 rpm
    Engine Speed from Step 18
    Engine Lug (Difference in Engine Speed From Initial Pressure Test and Step 18)	60 rpm or less
    High Pressure Oil of the Drive Loop	43000 ± 2000 kPa (6250 ± 300 psi)

19. Calculate the engine lug.

20. The parking brake is still engaged and the service brakes are still applied. Move the directional control lever to the NEUTRAL position.

21. Lower the bucket or the implement to the ground. Stop the engine.

22. If the engine speed is within the specification in the FORWARD position and within the specification in the REVERSE position, then check the following steps.

    1. If the engine lug is high, then the crossover relief valve pressure setting may be low. Go to Step 24. The setting for the pressure override valve (POR) may be high. Go to Step 25.

    2. If the engine lug is high and the pressures are within the specification, then there could be a problem with the engine fuel system. Refer to the 3054 Engine Systems Operation, Testing and Adjusting, SENR5816 for more information.

    3. If the high pressure oil of the drive loop is not within the specification in the FORWARD direction and in the REVERSE direction, then the POR valve must be adjusted. Go to the Step 25.

23. If the engine lug is not in the specification in one direction with the correct high pressure oil of the drive loop, then check the crossover relief valves. Go to the next Step in order to check the crossover relief valves.

Show/hide table



Illustration 22	g00475244
Location of the Crossover Relief Valves (6) Crossover relief valve for the forward direction. (7) Crossover relief valve for the reverse direction. (8) Bolts.

24. To check the crossover relief valves, place the disconnect switch in the OFF position. Disconnect battery cables. Rotate the battery tray in order to access the pump. Loosen the four bolts (8) on the left side drive line. Rotate the drive line in order to access crossover relief valve (6). Switch the two crossover relief valves.

    1. Repeat the hydrostatic stall test. If this brings the hydrostatic stall test within the specifications, then replace the faulty crossover relief valve.

Show/hide table



Illustration 23	g00475231
Location of the POR Valve Adjustment (9) Adjustment screw for the POR valve.

25. To make an adjustment to the POR valve, stop the engine. Place the disconnect switch in the OFF position. Disconnect the battery cables. Rotate the battery tray in order to access the pump. Loosen the locknut (9). Turn the adjustment screw (9) clockwise in order to increase the POR valve. Turn the adjustment screw (9) counterclockwise in order to decrease the POR valve. Tighten the locknut.

    1. Repeat the hydrostatic stall test.

Stall Test for the Implement System

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Show/hide table

NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

Table 5

REQUIRED TOOLS
Part Number	Description	Quantity
8T-0852	Gauge 0 to 40000 kPa	1
6V-3014	Hose Assembly	1
6V-4143	Coupler	2
6V-3989	Unvalved Nipple	1

The stall test for the implements is performed in order to determine if the implement system is causing a problem.

Show/hide table



Illustration 24	g00491063
Pressure Tap Location (10) Pressure tap for the main relief valve for the implements. (11) Main relief valve for the implements.

1. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0852 Pressure Gauge. The pressure gauge has a range of 0 to 40000 kPa (0 to 5800 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the implements (10) .

2. Sit in the seat and fasten the seat belt.

3. Move the direction control lever to the NEUTRAL position. Engage the parking brake. Do not apply the service brake.

4. Press the speed select switch in the FAST position.

5. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

6. Increase the engine speed to high idle.

7. Raise the bucket or the implement off the ground. Move the bucket lever to the TILT BACK position.

   Note: Do not hold the bucket lever in the TILT BACK position for more than 15 seconds.

8. Record the engine speed and the implement pressure. Release the accelerator pedal.
   Show/hide table

   Table 6

   Stall Test for the Implements
   Test	Spec	Actual
   Engine Speed from Initial Pressure Test	2320 ± 50 rpm
   Engine Speed from Step 8
   Engine Lug (Difference in Engine Speed From Initial Pressure Tests and Step 8)	100 rpm or less
   Implement Pressure	24550 ± 700 kPa (3550 ± 100 psi)

9. Decrease the engine speed to low idle. Move the direction control lever to the NEUTRAL position. Stop the engine.

10. Calculate the engine lug.

11. If the pressure for the implement system is not within the specification, then adjust or replace the implement relief valve (11) .

12. If the engine lug is high and the pressures are within the specification, then there could be a problem with the engine fuel system. Refer to the 3054 Engine Systems Operation, Testing and Adjusting, SENR5816 for more information.

Hydrostatic Stall Test and Stall Test for the Implement System

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Show/hide table

NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

This test determines that the engine output is set to the correct specification by stalling the hydrostatic system and the implement system. This test also checks the engine condition and the setting for the POR valve.

1. Sit in the seat and fasten the seat belt.

2. Move the direction control lever to the NEUTRAL position. Fully engage the parking brake.

3. Apply the service brake and hold the service brake.

4. Place the speed selector switch in the FAST position.

5. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

6. Raise the bucket or the implement off the ground.

Note: The condition of the parking brake and the service brake may allow the machine to drive through the brakes. New brake pads and a new brake drum require a break-in period before the maximum braking capacity can be obtained. This break-in period varies and the period is dependent upon the braking applications.

7. Increase the engine speed to high idle.

   Note: No movement of the machine is allowed. If the machine moves, refer to the Brake Systems Operation, Testing and Adjusting, SENR6772-01 for (PIN: 7ZM1-5998ZM1-499). Refer to the Brake Systems Operation, Testing and Adjusting, RENR2810 for (PIN: 7ZM600-UP8ZM500-UP).

8. Move the direction control lever to the FORWARD position. Move the bucket lever to the TILT BACK position.

Show/hide table

NOTICE
Do not hold the drive pressure for more than 15 seconds.

9. Record the engine speed and high pressure oil of the drive loop. Release the accelerator pedal.
   Show/hide table

   Table 7

   Hydrostatic Stall Test and the Stall Test for the Implement System
   Test	Spec	Actual
   Engine Speed From Initial Pressure Test	2320 ± 50 rpm
   Engine Speed from Step 9
   Engine Lug (Difference in Engine Speed from Initial Pressure Test to Step 9)	less than 75 ± 55 rpm
   High Pressure Oil of the Drive Loop	43000 ± 2000 kPa (6240 ± 290 psi)

10. Decrease the engine speed to low idle. Lower the bucket or attachment to the ground. Move the direction control lever to the NEUTRAL position. Stop the engine.

11. Calculate the engine lug.

12. If the engine lug is high, then there is low engine power. Refer to the 3054 Engine Systems Operation, Testing and Adjusting, SENR5816 for more information.

13. Install chocks around the wheels.

Show/hide table



Illustration 25	g00533089
(4) Nut. (5) Parking brake cable.

14. Disengage the parking brake. Loosen nut (4). Adjust the parking brake cable to the original position. Fully engage the parking brake.

Show/hide table



Illustration 26	g00533088
(2) Bolts. (3) Cover for the parking brake.

15. Install the cover for the parking brake (3). Engage the parking brake. Tighten three bolts (2) .

Show/hide table



Illustration 27	g00533087
(1) Bolt.

16. Tighten bolt (1) .

17. Remove the chocks around the wheels.

Pump Tests

Start To Move

Show/hide table

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the power train.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Show/hide table

NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

This test determines if the engine speeds and machine speeds are correct at the start of machine movement.

1. Sit in the seat and fasten the seat belt.

2. Move the direction control lever to the NEUTRAL position. Engage the parking brake.

3. Press the speed select switch in the SLOW position.

4. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

5. Apply the service brake and hold the service brake.

6. Raise the bucket or the implement off the ground.

7. Move the direction control lever to the FORWARD position.

8. Increase the engine speed until the pressure gauge for high pressure oil of the drive loop indicates 8000 ± 4000 kPa (1160 ± 580 psi). Record the engine speed and signal oil pressure.
   Show/hide table

   Table 8

   Test for the Speed Sensing Valve in the FORWARD position
   Test	Spec	Actual
   High Pressure Oil of the Drive Loop	8000 ± 4000 kPa (1160 ± 580 psi)
   Engine Speed	1065 ± 75 rpm
   Signal Oil Pressure	650 ± 100 kPa (95 ± 15 psi)

9. Decrease the engine speed to low idle. Move the direction control lever to the NEUTRAL position.

10. The parking brake is still engaged and the service brake is still applied. Move the direction control lever to the REVERSE position.

11. Increase the engine speed until the pressure gauge for high pressure oil of the drive loop indicates 8000 ± 4000 kPa (1160 ± 580 psi). Record the engine speed and the signal oil pressure.
    Show/hide table

    Table 9

    Test for the Speed Sensing Valve in the REVERSE position
    Test	Spec	Actual
    High Pressure Oil of the Drive Loop	8000 ± 4000 kPa (1160 ± 580 psi)
    Engine Speed	1065 ± 75 rpm
    Signal Oil Pressure in FORWARD
    Signal Oil Pressure in REVERSE
    Change in Signal Oil Pressure From FORWARD to REVERSE	± 100 kPa (± 15 psi)

12. Calculate the change in signal oil pressure from FORWARD to REVERSE.

13. Lower the bucket or attachment to the ground. Decrease the engine speed to low idle. Move the direction control lever to the NEUTRAL position. Engage the parking brake.

Show/hide table



Illustration 28	g00476343
(1) Adjustment Screw to the Speed Sensing Valve

14. If the signal pressure is within the specification and the change in signal pressure from FORWARD to REVERSE is within the specification, then go to the next test.

15. If the signal pressure is not within the specification, then place the disconnect switch in the OFF position. Disconnect the battery cables. Rotate the battery tray in order to access the pump.

    1. If the signal pressure is low in both directions, then adjust the speed sensing valve. Loosen the locknut. Turn the adjustment screw (1) to the speed sensing valve counterclockwise in order to increase the pump signal pressure. Repeat this test procedure. If the specifications are met, then go to the tests for the pump and for the motor. Skip the test for the pump neutral.

    2. If the signal pressure is high in both directions, then adjust the speed sensing valve. Loosen the locknut. Turn the adjustment screw (1) to the speed sensing valve clockwise in order to decrease the pump signal pressure. Repeat this test procedure. Skip the test for the pump neutral and go to the tests for the pump and for the motor.

16. If the change in signal pressure from FORWARD to REVERSE is not within the specification or if the signal pressure is low in one direction and high in the other direction, then go to the test for the pump neutral.

Test for the Pump Neutral

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Table 10

REQUIRED TOOLS
Part Number	Description	Quantity
8T-0850	Gauge 0 to 4000 kPa	1
6V-3014	Hose Assembly	1
6V-4143	Coupler	2
6V-3989	Unvalved Nipple	1
5P-2937	O-Ring Adapter	1

This test checks that the pump is fully destroked, while the machine is in the NEUTRAL position. The machine may move, if the pump is not fully destroked in the NEUTRAL position.

1. Sit in the seat and fasten the seat belt.

2. Move the direction control lever to the NEUTRAL position. Engage the parking brake.

3. Press the speed select switch in the SLOW position.

4. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature. Disengage the parking brake.

5. If the machine does not move in NEUTRAL, then go to the tests for the pump and for the motor.

Show/hide table



Illustration 29	g00475861
Removing Batteries and Battery Tray (1) Support assembly. (2) Disconnect switch. (3) Bolts. (4) Bolts. (5) Bolts. (6) Plate. (7) Bolt.

6. Place disconnect switch (2) in the OFF position. Disconnect battery cables. Remove two bolts (4). Loosen bolt (7) .

   Note: Ensure that there is enough thread engagement on bolt (7) to hold battery tray.

7. Rotate the battery tray in order to access the pump.

8. Remove five bolts (3). Remove four bolts (5). Remove support assembly (1) and plate (6) .

9. Remove the disconnect switch (2) from support assembly (1) .

Show/hide table



Illustration 30	g00475725
Pump Neutral (8) Port for the pump neutral. (9) Port for the pump neutral. (10) Adjustment for the pump actuator.

10. Remove plugs at port (8) and (9) .

11. Install a 5P-2937 O-Ring Adapter with a 1/4 NPT test fitting in ports (8) and (9).

12. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0850 Pressure Gauge. The pressure gauge has a range of 0 to 4000 kPa (0 to 580 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the fittings on ports (8) and (9) .

13. Move the direction control lever to the NEUTRAL position. Engage the parking brake.

14. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

15. Increase the engine speed to high idle.

16. The difference between the pressures of the two gauges should be within 0 to 50 kPa (0 to 7 psi) of each other.

17. If the pressures are not within the specification, then do the following steps:

    1. Turn adjustment screw (10) clockwise until the pressure increases in one of the two gauges. Mark the location on the screw.

    2. Turn adjustment screw (10) counterclockwise until the pressure increases in the opposite gauge. Mark the location on the screw.

    3. Turn the adjustment screw (10) clockwise to the halfway point between the two marks. Both gauges should indicate identical pressures.

    4. Tighten the locknut to 7 N·m (5 lb ft).

Show/hide table



Illustration 31	g00475861
Installing Batteries and Battery Tray (1) Support assembly. (2) Disconnect switch. (3) Bolts. (4) Bolts. (5) bolts. (6) Plate. (7) Bolt.

18. Install the disconnect switch (2) to support assembly (1) .

19. Install plate (6) and support assembly (1). Tighten five bolts (3) and four bolts (5) .

20. Rotate the battery tray into the proper position. Tighten three bolts (4) and (7) on the battery tray. Ensure that the test hoses are not pinched.

21. Connect the battery cables. Place the disconnect switch (2) in the ON position.

Tests for the Pump and for the Motor

Note: The motor should destroke, when the machine is in the FAST speed mode. To check that the motor destrokes, operate the machine at maximum speed in the SLOW mode. Select the FAST speed mode. If the machine speeds up then the motor has destroked. However, this test cannot determine if the motor is set properly. The next tests will determine if the motor is set properly.

Maximum Runout

This test checks for the pump and motor displacement control. The test is used to determine if the engine speed and machine speed for the maximum speed in both speed modes are correct.

Note: This test requires the tires to be removed and this test requires the machine to be placed on stands. This test is more accurate than the speed trap test. If this test cannot be done, then go to the speed trap test.

Table 11

REQUIRED TOOLS
Part Number	Description	Quantity
1U-9760	Stands	4

1. Place the steering frame lock in the LOCKED position.

2. Use ET or ECAP in order to record the engine speed and the motor speed. The drive shaft speed is not required, if the motor speed is recorded. If the machine is not equipped with an ECM, then two 9U-7400 Multitach can be used to measure the engine speed and the drive shaft speed. The motor speed is not required, if the drive shaft speed is recorded.

Show/hide table



Illustration 32	g00476696
Machine on Stands

3. Raise the machine with a suitable lifting device.

4. Remove the tires. As each tire is removed, place 1U-9760 Stand under the outer end of each axle.

   Note: Place the stands at the lowest height that is possible in order to increase stability.

5. Sit in the seat and fasten the seat belt.

6. Move the direction control lever to the NEUTRAL position.

7. Press the speed select switch in the SLOW position.

8. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

9. Move the direction control lever to the FORWARD position.

10. Increase the engine speed to high idle. Read the pressure gauges and ECAP. Compare these values to the columns for SLOW mode in Table 12. Move the directional control lever to the NEUTRAL position.

11. Move the direction control lever to the REVERSE position.

12. Increase the engine speed to high idle. Read the pressure gauges and ECAP. Compare these values to the columns for SLOW mode in Table 12 or Table 13. Move the directional control lever to the NEUTRAL position.

13. Decrease engine speed to low idle. Apply the service brake. Move the direction control lever to the FORWARD position. Place the speed selector switch in the FAST position. Release the service brake. Increase the engine speed to high idle.

14. Compare these values to the columns for FAST mode in Table 12 or Table 13. Decrease the engine speed to low idle. Apply the service brake. Move the directional control lever to the NEUTRAL position. Stop the engine.

Table 12

Maximum Runout for the 914G
Item	SLOW Mode		FAST Mode
	Spec	Actual	Spec	Actual
Engine Speed	2310 ± 50 rpm		2300 ± 75 rpm
Drive Shaft Speed	499 ± 20 rpm		1435 ± 48 rpm
Motor Speed	1310 ± 50 rpm		3765 ± 125 rpm
High Pressure Oil of the Drive Loop	5750 ± 1000 kPa (834 ± 145 psi)		9700 ± 1000 kPa (1407 ± 145 psi)
Pump Signal	3050 ± 250 kPa (440 ± 35 psi)		2975 ± 250 kPa (430 ± 36 psi)

Table 13

Maximum Runout for the IT14G
Item	SLOW Mode		FAST Mode
	Spec	Actual	Spec	Actual
Engine Speed	2310 ± 50 rpm		2300 ± 75 rpm
Drive Shaft Speed	445 ± 17 rpm		1403 ± 42 rpm
Motor Speed	1310 ± 50 rpm		4125 ± 125 rpm
High Pressure Oil of the Drive Loop	5750 ± 1000 kPa (834 ± 145 psi)		9900 ± 1200 kPa (1435 ± 175 psi)
Pump Signal	3050 ± 250 kPa (440 ± 35 psi)		2975 ± 250 kPa (430 ± 36 psi)

Speed Trap

Note: Do this test only if the maximum runout cannot be done. At least 200 meters of relatively flat terrain is required to do the speed trap test.

1. Place the disconnect switch in the OFF position. Disconnect the battery cables. Rotate the battery tray in order to access the pump. Disconnect all of the test lines from the pump and from the machine.

2. Rotate the battery tray into the proper position. Tighten the bolts to the battery tray. Connect the battery cables. Place the disconnect switch in the ON position.

Show/hide table



Illustration 33	g00492429
(PIN: 9WM1-871WN1-94) (1) Linkage. (2) Nut. (3) Stud. (4) Lever.

3. Connect linkage (1), which connects the inching valve to the master cylinder for the service brakes. Remove the nut (2) from the stud (3) .

Show/hide table



Illustration 34	g00492430
(PIN: 9WM88-12981WN95-898) (5) Linkage. (6) Lever.

4. Connect the linkage (5) from the lever (6). The lever is attached by a ball joint with a quick release.

Show/hide table



Illustration 35	g00464045
Shutoff Valve (7) Stem. (8) Shutoff valve. (PIN: 9WM1299-UP1WN899-UP)

5. Rotate stem (7) on shutoff valve (8) clockwise in order to open the hydraulic oil to the inching valve.

Show/hide table



Illustration 36	g00460744
Location of the Parking Brake Relay and the Parking Brake Alarm Relay (9) Parking brake alarm relay. (10) Parking brake relay.

6. Remove the 2G-5298 Wire Assembly. Install relays (9) and (10) and install the relay panel.

7. Sit in the seat and fasten the seat belt.

8. Move the direction control lever to the NEUTRAL position. Engage the parking brake.

9. Press the speed select switch in the SLOW position.

10. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

11. Raise the bucket or the implement off the ground.

12. Release the service brake. Disengage the parking brake. Increase the engine speed to high idle.

13. The first 100 meters will allow the machine to get to maximum speed. Time the second 100 meters. The machine should travel the distance in 37 ± 3 seconds.

14. Press the speed select switch in the FAST mode. Increase the engine speed to high idle.

15. The first 100 meters will allow the machine to get up to maximum speed. Time the second 100 meters. The machine should travel the distance in 10 ± 1 seconds.

16. Release the accelerator pedal. Apply the service brakes. Move the direction control lever to the NEUTRAL position. Stop the engine.

17. Install all of the test equipment. Rotate stem (7) on shutoff valve (8) counterclockwise in order to close the hydraulic oil to the inching valve. Otherwise, disconnect the linkage to the inching valve in order to close the hydraulic oil to the inching valve. Remove relays (9) and (10) and install the relay panel. Install the 2G-5298 Wire Assembly .

Test for the Motor Displacement Control

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Show/hide table

NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

This test determines when the variable displacement motor is destroking.

Variable Displacement Motor

Table 14

REQUIRED TOOLS
Part Number	Description	Quantity
8T-0861	Gauge 0 to 60000 kPa	1
6V-3014	Hose Assembly	3
6V-4143	Coupler	6
8T-2352	Tee	2
1S-8937	Needle Valve	1
6V-8397	O-Ring Seal	3
6V-3966	Valved Nipple Assembly	4
6V-9829	Cap	1
6V-9508	Face Seal Plug	1
6V-3989	Unvalved Nipple	2

Show/hide table



Illustration 37	g00476140
(1) Plug. (2) Tee. (3) Valved Nipple Assembly. (4) Cap.

1. Assemble two 8T-2352 Face Seal Tee (2) with two 6V-8397 O-Ring Seal, two 6V-3966 Valved Nipple Assembly (3), and 6V-9829 Cap (4) .

Show/hide table



Illustration 38	g00500169
(1) Plug. (5) Valved nipple assembly. (6) Valved nipple assembly.

2. Disconnect the pump signal line. Install plug (4) onto the pump signal line. Install the assembled tee piece onto the motor.

Show/hide table



Illustration 39	g00508866
(7) Valved nipple assembly. (8) Needle valve.

3. Install two 6V-3966 Valved Nipple Assembly (7) to 1S-8937 Needle Valve (8) .

Show/hide table



Illustration 40	g00500172
(9) Pressure tap for the charge pump.

4. Remove the pressure gauge from the charge pump (9). Install the pressure gauge to nipple assembly (6) .

5. Install one 6V-4143 Coupler Assembly to each end of 6V-3014 Hose Assembly. Install one end of the hose to the charge pump (9). Install the other end of the hose to inlet of the needle valve (8) .

   Note: Charge pressure will be used instead of signal pressure, because charge pressure is more stable.

6. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install one end of the hose to the outlet of the needle valve (8). Install the other end to valved nipple assembly (5) .

Show/hide table



Illustration 41	g00500166
Location of M1 Pressure Tap to the High Pressure Oil of the Motor on Top of the Variable Displacement Motor (10) Pressure tap for high pressure oil of the motor (M1) .

7. Install one 6V-4143 Coupler Assembly to each end of the 6V-3014 Hose. Install 6V-3989 Unvalved Nipple to 8T-0861 Pressure Gauge. The pressure gauge has a range of 0 to 60000 kPa (0 to 8700 psi). Install the pressure gauge to one end of the 6V-3014 Hose. Install the other end of the hose assembly to the pressure tap for the high pressure oil of the motor M1 (10) .

8. Clearly label the hydraulic test lines. Secure the hydraulic lines so that the pressure gauge can be viewed during the test. Do NOT hold the pressure gauge or the hydraulic line.

9. Sit in the seat and fasten the seat belt.

10. Move the direction control lever to the NEUTRAL position. Engage the parking brake.

11. Press the speed select switch in the SLOW position.

12. Turn the needle valve (8) counterclockwise in order to block the charge oil.

13. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

14. Very slowly open the needle valve (8) until the charge pressure is approximately 1600 kPa (230 psi).

    Note: The charge pressure will slowly continue to increase.

15. Apply the service brakes and hold the service brakes. Move the direction control lever to the REVERSE position.

16. Slowly increase the engine speed. The high pressure oil of the motor M1 will increase with engine speed. Watch the point when M1 pressure falls quickly. Record the M1 pressure and the charge pressure just before the M1 pressure falls.

17. Release the accelerator pedal. Move the direction control lever to the NEUTRAL position. Stop the engine.

18. Open the needle valve (8) counterclockwise in order to relieve the pressure. Once the pressure drops to 0 kPa (0 psi), then close the needle valve (8) .

19. Repeat the test with the charge pressure at approximately 2200 kPa (320 psi).

Show/hide table



Illustration 42	g00476145
Charge pressure. M1Pressure (A) M1 pressure. (B) Charge pressure. (C) Maximum Value. (D) Nominal Value. (E) Minimum Value.

20. Plot the three points on the Chart 42.

21. If the pressures are not within the limits of the chart, then the displacement control valve must be adjusted.
    Show/hide table
    
    

    Illustration 43	g00500167
    Location of the Adjustment Screw for the Displacement Control Valve for the Motor (11) Adjustment screw for the displacement control valve for the motor.

    1. Remove the cap from the adjustment screw (11). Loosen the locknut.

    2. If the point is above the line for the maximum value, then the motor will stroke too late causing the engine to lug. The pressure to the displacement control valve needs to be decreased. Turn the adjustment screw (11) counterclockwise in order to decrease the M1 pressure. Tighten the locknut.

    3. If the point is below the line for the minimum value, then the motor will stroke too soon causing the travel speed to be slow. The pressure to the displacement control valve needs to be increased. Turn the adjustment screw (11) clockwise in order to increase the M1 pressure. Tighten the locknut.

    4. Repeat the test for the motor displacement control.

22. If the pressures are within the limits on the chart, then do the following steps.

    1. Open needle valve (8). There should be no pressure on the pressure gauge for the charge pressure at valved nipple assembly (6) .

    2. Remove the tee fitting and needle valve (8). Connect the pump signal line (4). Install the pressure gauge to the charge pump (9) .

Test for the Inching Valve

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

1. Sit in the seat and fasten the seat belt.

2. Start the engine and allow the machine to reach normal operating temperature.

3. With the machine at low idle, raise the empty bucket or attachment slightly.

4. Move the directional control lever to the FORWARD direction. The parking brake is still engaged. If the machine is equipped with a speed select switch, press the speed select switch to SLOW. If the machine is equipped with a creeper speed control, move the lever for the creeper speed control all the way forward into the SLOW detent.

5. Increase the engine speed until the high pressure oil of the drive loop is 15000 ± 5000 kPa (2175 ± 725 psi).

6. Slowly apply the service brake until the high pressure oil of the drive loop decreases to 6000 ± 2000 kPa (870 ± 290 psi).

7. Record the first signal oil pressure.

8. Continue to apply the service brake until the service brake pressure is 500 ± 200 kPa (75 ± 30 psi).

9. Record the second signal oil pressure.
   Show/hide table

   Table 15

   Test for the Inching Valve
   Test	Spec	Actual
   First Signal Oil Pressure	Larger
   Second Signal Oil Pressure	Smaller

10. The first signal oil pressure should be larger than the second signal oil pressure. This verifies that the signal oil pressure during the inching mode is greater than the signal oil pressure during braking.

11. If the first signal oil pressure is lower than the second signal oil pressure, then do one of the following steps:

    1. For (PIN: 7ZM1-599, 8ZM1-499), check the adjustment for the inching valve. Refer to Systems Operation, Testing and Adjusting 914G Wheel Loader and IT14G Integrated Toolcarrier, SENR6772-01, "Service Brake Control - Adjust".

    2. For (PIN: 7ZM600-UP, 8ZM500-UP), replace the brake valve.

Final Tests

Show/hide table

To prevent personal injury when checks are made while the machine is in operation, make sure only approved personnel are on the machine. Keep other personnel off the machine and in view of the operator. Make sure checks are done in an open area.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Do the final tests only if a pump or a motor has been replaced. If the final tests are not required, then go to the next procedure.

Illustration 44	g00476696
Machine on Stands

1. Raise the machine with a suitable lifting device.

2. Remove the tires. As each tire is removed, place a 1U-9760 Stand under the outer end of each axle.

   Note: For maximum stability, place the stands at the lowest possible height.

3. Lower the bucket or the attachment to the ground.

4. Move the direction control lever to the NEUTRAL position. Engage the parking brake.

5. Start the engine and run the engine at low idle. Allow the engine to reach normal operating temperature.

6. Press the speed select switch in the FAST position. Move the direction control lever to the FORWARD position.

7. Increase the engine speed to high idle. Record the engine speed, the pressure for the pump case, the charge pump pressure, the signal oil pressure, the pressure for the cooling loop, and the MS pressure.
   Show/hide table

   Table 16

   Final Test for the 914G
   Test	High Idle
   	Spec	Actual
   Engine Speed	2300 ± 90 rpm
   Motor Speed	3755 ± 200 rpm
   Drive Shaft	1432 ± 75 rpm
   High Pressure Oil of the Drive Loop	9700 ± 1000 kPa (1407 ± 145 psi)
   Charge Pressure	3100 ± 250 kPa (450 ± 36 psi)
   Signal Oil Pressure	2950 ± 250 kPa (428 ± 36 psi)
   Pressure for the Pump Case	125 ± 50 kPa (18 ± 7 psi)
   Pressure for the Cooling Loop	400 ± 150 kPa (60 ± 20 psi)

   Show/hide table

   Table 17

   Final Test for the IT14G
   Test	High Idle
   	Spec	Actual
   Engine Speed	2270 ± 120 rpm
   Motor Speed	4100 ± 200 rpm
   Drive Shaft	1395 ± 68 rpm
   High Pressure Oil of the Drive Loop	9900 ± 1200 kPa (1435 ± 175 psi)
   Charge Pressure	3100 ± 250 kPa (450 ± 36 psi)
   Signal Oil Pressure	2950 ± 250 kPa (428 ± 36 psi)
   Pressure for the Pump Case	125 ± 50 kPa (18 ± 7 psi)
   Pressure for the Cooling Loop	400 ± 150 kPa (60 ± 20 psi)

8. Decrease the engine to low idle. Move the direction control lever to the NEUTRAL position. Stop the engine.

Show/hide table



Illustration 45	g00476048
Installing Batteries and Battery Tray (1) Disconnect Switch. (2) Battery. (3) Bolts. (4) Battery tray.

9. Place disconnect switch (1) in the OFF position.

10. Disconnect battery cables. Rotate the battery tray in order to access the pump.

11. Remove all of the test equipment.

12. Rotate the battery tray (4) into the proper position. Tighten three bolts (3) to a torque of 55 ± 10 N·m (40 ± 7 lb ft). Connect the battery cables. Place disconnect switch (1) in the ON position.

Returning the Machine to Operating Condition

Open the Inching Valve

(PIN: 9WM1-87; 1WN1-94)

Show/hide table



Illustration 46	g00492429
(1) Linkage. (2) Nut. (3) Stud. (4) Lever.

1. Connect linkage (1), which connects the inching valve to the master cylinder for the service brakes. Remove the nut (2) from the stud (3) .

(PIN: 9WM88-1298; 1WN95-898)

Show/hide table



Illustration 47	g00492430
(5) Linkage. (6) Lever.

1. Connect the linkage (5) to the lever (6). The lever is attached by a ball joint with a quick release.

(PIN: 9WM1299-UP; 1WN899-UP)

Show/hide table



Illustration 48	g00474235
Shutoff valve (7) Stem. (8) Shutoff Valve.

1. The shutoff valve is located on the right side of the machine. Raise the engine hood. Prop the hood support.

2. Rotate stem (7) on shutoff valve (8) clockwise until the pin on the shutoff valve prevents further rotation. This opens the hydraulic oil to the inching valve.

Activate the Neutralizer to the Hydrostatic System

When the parking brake is applied, the limit switch on the parking brake control lever will signal the hydrostatic system to neutralize. This procedure will allow the hydrostatic system to ignore the limit switch on the parking brake control lever.

Show/hide table



Illustration 49	g00492763
Jumper Wire Location (9) Location F3. (10) Location D5.

1. Remove 2G-5298 Wire Assembly from the relay panel at locations F3 (9) and D5 (10) .

Show/hide table



Illustration 50	g00492764
Location of the Parking Brake Relay and Parking Brake Alarm Relay (11) Parking brake alarm relay. (12) Parking brake relay.

2. Enable the neutralizer to the hydrostatic system by installing the parking brake alarm relay (11) and the parking brake relay (12) .

3. Install the access panel on the lower right side of the machine by the door.