914G and 914G2 Compact Wheel Loaders and IT14G and IT14G2 Integrated Toolcarrier Hydraulic System Caterpillar

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Personal injury or death can result from improper accumulator charging. Dry Nitrogen is the only gas approved for use in the accumulator. Charging the accumulator with oxygen will cause an explosion. This danger will not happen if nitrogen cylinders with standard CGA (Compressed Gas Association, Inc.) Number 580 connections are used. When ordering nitrogen gas, be sure that the cylinders are equipped with CGA Number 580 connections. Do not use color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders Never use an adapter to connect your nitrogen charging group to a valve outlet used on both nitrogen, oxygen, or other gas cylinders. BE SURE YOU USE DRY NITROGEN (99.8% purity).

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Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic systems. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component. Lower all attachments to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the attachment in the raised position, the attachments and lift cylinders must be supported properly. Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.

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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the work tool to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock.

Ride Control Accumulator

The ride control accumulator acts as a shock absorber when the machine travels over rough terrain with a loaded work tool. The force of the load acts against the head end of the lift cylinders. Hydraulic oil from the head end of the lift cylinders flows to the accumulator. The flow of hydraulic oil acts against the nitrogen within the accumulator.

Test for the Ride Control Valve

Note: You can use the electronic technician software to perform some tests on the machine. Through the electronic technician software, verify that the machine contains the ride control system.

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Illustration 1	g01043989
Ride control switch

1. Start the engine. Turn the ride control switch to the OFF position.

2. Raise the bucket. Put the bucket into the DUMP position.

3. Lower the bucket to the ground. Continue to apply downward pressure. Lift the front wheels off the ground.

4. Lower the front wheels to the ground.

5. Turn the ride control switch to the ON position.

6. Apply downward pressure. Try to lift the front wheels off the ground. The front wheels should not come off the ground.

7. Raise the bucket off the ground. Place the bucket level with the ground. Lower the bucket to the ground. Apply the parking brake. Turn off the engine.

Test for the Automatic Ride Control Function

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Illustration 2	g01043989
Ride control switch

1. Start the engine. Place the ride control switch in the ON position.

2. Place the machine in the gear to travel above 9.7 km/h (6.0 mph). Disengage the parking brake. Raise the bucket off the ground.

3. Run the machine above 9.7 km/h (6.0 mph) in order to activate the ride control option.

4. When the ride control option is activated, the light in the center of the ride control switch will illuminate. When the ground speed falls below 9.7 km/h (6.0 mph), the light will turn off.

5. Stop the machine. Lower the bucket to the ground. Engage the parking brake. Turn off the engine.

Shut Down Procedure

1. Move the machine to a hard, level surface.

2. Move the transmission control lever to the NEUTRAL position.

3. Engage the parking brake.

4. Turn the ride control switch to the ON position.

5. Lower all attachments to the ground.

6. Move the lift control lever to the FLOAT position.

7. Stop the engine.

8. Turn the engine start switch to the OFF position and remove the key.

Discharging the Accumulator

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Illustration 3	g01043989
Ride control switch

1. While the engine is running, turn the ride control switch to the ON position.

2. Lower the bucket or attachment to the ground. Then, move the lift control valve to the FLOAT position. This will relieve all of the hydraulic pressure in the accumulator.

3. Stop the engine. Disconnect the hydraulic lines for servicing, as needed.

   Note: If the accumulator must be replaced, perform Steps 1 through 3. Then, use the following procedure:

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   Illustration 4	g01043992
   The position of the ride control accumulator

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   Illustration 5	g01043995

   1. Remove guard (1) which protects nitrogen charging valve (2) .

   2. Remove the protective cap on nitrogen charging valve (2) .
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   Illustration 6	g00282185
   (3) Nipple. (4) Coupling assembly. (5) Pressure gauge. (6) Hose assembly. (7) Coupling assembly. (8) Nipple. (9) Valve. (10) Pressure gauge. (11) Regulator assembly. (12) Pressure regulating screw. (13) Chuck for the nitrogen cylinder valve. (14) Valve handle. (15) Nitrogen charging chuck. (16) Hose assembly. (17) Tee.

   3. Identify the correct nitrogen charging chuck.

      Note: For a nitrogen charging valve with a .305 inch -32 THD, use a 1S-8938 Nitrogen Charging Chuck and a 1U-5551 Extension Assembly. For a nitrogen charging valve with a .482 inch -26 THD, use a 7S-5106 Nitrogen Charging Chuck and a 7S-5439 Extension Assembly .

   4. Attach hose assembly (16) to nitrogen charging chuck (15) .

   5. Turn the valve handle (14) on nitrogen charging chuck (15) all the way in the counterclockwise direction. This will ensure that nitrogen charging valve (2) will not be opened when nitrogen charging chuck (15) is attached to the nitrogen charging valve.

   6. Attach nitrogen charging chuck (15) and hose assembly (16) to nitrogen charging valve (2) .

   7. Place the open end of hose assembly (16) away from the work area and away from other personnel.

   8. Turn valve handle (14) on nitrogen charging chuck (15) all the way in the clockwise direction in order to open nitrogen charging valve (2). This will release all of the compressed gas from the accumulator through hose assembly (16). Now, the accumulator can be removed from the machine.

Nitrogen Charging Procedure

1. Move the machine to level ground.

2. Move the transmission control lever to the NEUTRAL position. Move the transmission neutral lock to the LOCKED position.

3. Engage the parking brake.

4. Start the engine. Keep the engine running during the following steps.

5. Move the lift control lever to the FLOAT position. Turn the ride control switch to the ON position.

6. Remove guard (1) which protects nitrogen charging valve (2) .

7. Remove the protective cap on nitrogen charging valve (2) .

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Illustration 7	g00282185
(3) Nipple. (4) Coupling assembly. (5) Pressure gauge. (6) Hose assembly. (7) Coupling assembly. (8) Nipple. (9) Valve. (10) Pressure gauge. (11) Regulator assembly. (12) Pressure regulating screw. (13) Chuck for the nitrogen cylinder valve. (14) Valve handle. (15) Nitrogen charging chuck. (16) Hose assembly. (17) Tee.

8. Turn valve handle (14) on nitrogen charging chuck (15) all the way in the counterclockwise direction. Attach the appropriate nitrogen charging chuck (15) to nitrogen charging valve (2) .

   Note: For a nitrogen charging valve with a .305 inch -32 THD, use a 1S-8938 Nitrogen Charging Chuck and a 1U-5551 Extension Assembly. For a nitrogen charging valve with a .482 inch -26 THD, use a 7S-5106 Nitrogen Charging Chuck and a 7S-5439 Extension Assembly .

9. Attach hose assembly (16) between nitrogen charging chuck (15) and tee (17). Install needle valve (9) on one of the connecting points of the tee. Install an 8T-0858 Pressure Gauge in the remaining open port on the tee. The pressure gauge is rated at 0 to 16000 kPa (0 to 2300 psi).

10. Install coupling assembly (7) in the open port of needle valve (9) .

11. Install nipple (8) on one end of hose assembly (6). Place the open end of the hose assembly away from the work area and away from other personnel.

12. Open needle valve (9) and turn valve handle (14) on nitrogen charging chuck (15) all the way in the clockwise direction.

13. Raise the lift arms all the way in order to momentarily relieve the nitrogen pressure charge.

14. Close needle valve (9) .

15. Lower the bucket to the ground. Move the lift control lever to the FLOAT position.

16. Attach the open end of hose assembly (6) to regulator assembly (11). Install an 8T-0859 Pressure Gauge in the port that is directly above the regulator. This pressure gauge is rated at 0 to 25000 kPa (0 to 3600 psi).

    Install an 8T-0856 Pressure Gauge in the remaining port next to regulator assembly (11). This pressure gauge is rated at 0 to 6000 kPa (0 to 870 psi).

17. Install regulator assembly (11) on nitrogen tank valve (2). Adjust screw (12) on regulator (11) in order to set the pressure on the 8T-0856 Pressure Gauge. Charge the accumulator to a charge pressure of 2750 ± 100 kPa (400 ± 14.5 psi).

    Note: To ensure that the accumulator nitrogen charge is correct, the accumulator piston must be at the bottom of the accumulator cylinder. Nitrogen pressure varies with the temperature. To obtain the most accurate nitrogen charge, the temperature of the accumulator should equal the outside air temperature. However, the temperature of the accumulator could be higher than the outside air temperature in some cases. If this is the case, the temperature of the accumulator should be used instead of the outside air temperature.

18. Open needle valve (9). The nitrogen pressure should appear on the 8T-0858 Pressure Gauge in 10 to 20 seconds.

    Note: If the nitrogen pressure appears on the pressure gauge in less time, close pressure regulating screw (12) on regulator assembly (11) and disconnect hose assembly (6) at coupling assembly (4). Close needle valve (9) and remove coupling assembly (4). Repeat Steps 5 through 18.

19. Turn valve handle (14) on nitrogen charging chuck (15) all the way in the counterclockwise direction. Close regulator (11) and needle valve (9). Slowly disconnect hose (16) from needle valve (9). Open needle valve (9) before you remove nitrogen charging chuck (15) from nitrogen charging valve (2) on the accumulator.

20. Install the protective cap on nitrogen charging valve (2). Install guard (1) over nitrogen charging valve (2) .