323F LN Excavator Machine Systems Caterpillar

Specification

Note: This procedure should only be performed if the Testing and Adjusting, "Main Pump (Flow) - Test (Hydraulic Power)" is not within specification.

Note: The flow specifications in Table 1 are target adjustments for setting the main hydraulic pump installed on the machine.

Note: The two pump calibration is the recommended procedure for making pump adjustments. The optional one pump calibration can be used when the two pump calibration is not applicable.

Note: The one pump calibration may not be as accurate as the two pump calibration procedure.

Note: Specifications for output flow rates are based on an engine speed of 1800 rpm. To attain more accurate test results, measured flow should be corrected with the following calculation.

Note: Specifications for output flow rates are based on a power shift pressure at the pump of 2500 kPa (363 psi). The output flow rate changes approximately 6 L/min (1.6 US gpm) for each 100 kPa (14 psi) of power shift pressure in the lower range of the constant horsepower control. The output flow rate changes approximately 3 L/min (0.8 US gpm) for each 100 kPa (14 psi) of power shift pressure in the higher range of the constant horsepower control.

Note: If the output flow rate of the pump is not within the specification, disconnect the negative flow control line from the pump that is being tested and perform the test again.

Note: Flow measurements must be done only during pressure rise.

Introduction

This test measures individual pump flow at the pump. Each pump is tested individually for output flow at specified pressures. The pump that is not being tested is not under load and the pump remains at low-pressure standby.

Preliminary Test

• Testing and Adjusting, "Main Pump (Flow) - Test (Hydraulic Power)"

Required Tools

Illustration 1	g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp

Illustration 2	g02535237
Tooling (C)

Illustration 3	g06256183
Tooling (D) (Flow meter tool layout)

Reference: Refer to Tool Operating Manual, NEHS1087 for operating instructions for the 348-5430 Multi-Tool Gp.

Note: Use Software License Card, NETG5049 with part number 348-5430 Multi-Tool Gp.

Machine Preparation

Illustration 4	g06256396
Flow meter tool layout Tooling (D) ( 4) Delivery line for drive pump (5) Delivery line for idler pump (10) Makeup line (11) Seal (12) Elbow

Drive Pump

Note: Perform the test for the drive pump and the test for the idler pump one at a time.

Illustration 5	g06257785
Pump compartment (1) Pressure tap (delivery pressure for drive pump) (2) Pressure tap (delivery pressure for idler pump) (3) Pressure tap (power shift pressure) (4) Delivery line for drive pump (5) Delivery line for idler pump

1. Position the machine on level ground.

2. Stop the engine.

3. Release pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".

4. Attach 311-1362 Vacuum Cap onto the hydraulic tank. Attach an air supply hose onto the assembly. Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.

5. Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 4.

   1. Disconnect delivery line (4) from the drive pump.

   2. Install seal (D15), half flanges (D13), and blocking cover (D16) to the end of the delivery line with bolts (D11), washers (D12), and nuts (D14).

   3. Refer to Illustration 4 and install tooling at the drive pump.
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      Illustration 6	g03862377
      Swing motor (top view) (10) Makeup line (11) Seal (12) Elbow

   4. Disconnect makeup line (10) from elbow (12) at the swing motor.

   5. Refer to Illustration 4 and install tooling at the swing motor.

6. Remove 311-1362 Vacuum Cap and install the filler plug for the hydraulic tank.

7. Connect portable hydraulic tester (D) and test hoses between coupling assembly at the drive pump and coupling assembly at the swing motor.

8. Attach a 41,368 kPa (6,000 psi) pressure sensor to pressure tap (1) for delivery pressure of the drive pump. Attach a 3445 kPa (500 psi) pressure sensor to pressure tap (3) for power shift pressure.

9. Install tooling (C) on the engine to monitor engine speed.

Idler Pump

Note: Perform the test for the drive pump and the test for the idler pump one at a time.

Illustration 7	g06257785
Pump compartment (1) Pressure tap (delivery pressure for drive pump) (2) Pressure tap (delivery pressure for idler pump) (3) Pressure tap (power shift pressure) (4) Delivery line for drive pump (5) Delivery line for idler pump

1. Position the machine on level ground.

2. Stop the engine.

3. Release pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".

4. Attach 311-1362 Vacuum Cap onto the hydraulic tank. Attach an air supply hose onto the assembly. Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.

5. Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 4.

   1. Disconnect delivery line (5) from the idler pump.

   2. Install seal (D15), half flanges (D13), and blocking cover (D16) to the end of the delivery line with bolts (D11), washers (D12), and nuts (D14).

   3. Refer to Illustration 4 and install tooling at the idler pump.
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      Illustration 8	g03862377
      Swing motor (top view) (10) Makeup line (11) Seal (12) Elbow

   4. Disconnect makeup line (10) from elbow (12) at the swing motor.

   5. Assemble and install seals (D20), tee (D21), adapter (D19), seal (D4), and fitting (D5) to elbow (12) at the swing motor.

   6. Install seal (11) and makeup line (10) to tee (D21).

6. Remove 311-1362 Vacuum Cap and install the filler plug for the hydraulic tank.

7. Connect portable hydraulic tester (D) and test hoses between coupling assembly at the idler pump and coupling assembly at the swing motor.

8. Attach a 41,368 kPa (6,000 psi) pressure sensor to pressure tap (2) for delivery pressure of the idler pump. Attach a 3445 kPa (500 psi) pressure sensor to pressure tap (3) for power shift pressure.

9. Install tooling (C) on the engine to monitor engine speed.

Test Procedure

Note: Perform the test for the drive pump and the test for the idler pump one at a time.

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To prevent personal injury or equipment damage from failure of the hydraulic test equipment or associated circuit components because of blocked pump flow, make sure that the test equipment valves are fully open before starting the engine.

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To prevent personal injury and/or equipment damage from failed lines or components while the hydraulic test equipment is returned to the open flow position, slowly open the hydraulic test equipment valve while monitoring the pump flow. If pump flow does not increase as the valve is opened, shut the engine off and determine what is preventing the pump from upstroking.

1. Start the engine.

2. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

3. Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF.

4. Enter the service mode.

   1. Input the password "9992".

   2. Select "Override Parameters".

5. Override "Desired Engine Speed" to 1800 rpm.

6. Override "Power Shift Pressure" to 1700 kPa (247 psi).

   Note: Confirm the power shift pressure setting at pressure tap (3).

7. Override "Pump #1 Flow Limit Pressure" or "Pump #2 Flow Limit Pressure" to 0 kPa (0 psi) to upstroke the pump being tested. The pump not being tested should remain at standby pressure.

   Note: Actual NFC pressure may not be 0 kPa (0 psi).

8. Override "Desired Fan Speed" to 850 rpm or less.
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   Illustration 9	g02599896
   Portable hydraulic tester (flow meter) (D1) Portable hydraulic tester (flow meter) (17) Valve

9. Turn valve (17) on the portable hydraulic tester clockwise. Record pump flow at each of the following pressures in Table 1. Use the pressure sensor at pressure tap (1) to monitor the delivery pressure of the drive pump or use pressure tap (2) to monitor the delivery pressure of the idler pump.

   Note: To perform flow measurements for either one of the pumps, the other pump must not be under load.

   Note: Flow measurements must be done only during pressure rise.

10. Turn valve (17) on the flow meter counterclockwise to the full open position.

11. Override "Power Shift Pressure" to 2500 kPa (363 psi).

    Note: Confirm the power shift pressure setting at pressure tap (3).

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    Illustration 10	g02599896
    Portable hydraulic tester (flow meter) (D1) Portable hydraulic tester (flow meter) (17) Valve

12. Turn valve (17) on the portable hydraulic tester clockwise. Record pump flow at each of the following pressures in Table 1. Use the pressure sensor at pressure tap (1) to monitor the delivery pressure of the drive pump or use pressure tap (2) to monitor the delivery pressure of the idler pump.

    Note: To perform flow measurements for either one of the pumps, the other pump must not be under load.

    Note: Flow measurements must be done only during pressure rise.

13. Turn valve (17) on the flow meter counterclockwise to the full open position.

14. Stop the engine.