5230B Excavator Hydraulic System Piston Pump (Hydraulic Cooling) - Test and Adjust Caterpillar


Piston Pump (Hydraulic Cooling) - Test and Adjust
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1.1. Preparation
2.1. Margin Pressure Adjustment for the Hydraulic Cooling Piston Pump
3.1. Maximum Speed Adjustment

------ WARNING! ------

Hydraulic oil pressure can remain in the hydraulic oil system on this machine after the engine and pump have been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic systems. To prevent possible injury, refer to the procedure in Testing and Adjusting Manual, "Release of Pressure in the Hydraulic System".

When possible, the bucket must always be lowered to the ground before service is started. When it is necessary for the boom to be in the raised position while tests or adjustments are done, be sure that the boom, stick and bucket have correct support.

Be sure the swing parking brakes and the travel parking brakes are on and the brake release lines are disconnected and plugged.

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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Table 1
Required Tools    
Part Number     Part Description     Qty    
    Electronic Service Tool     1    
JERD2124     Single User License for Electronic Technician (ET)     1    
JERD2129     Service Subscription for ET     1    
NEXG4523     Communication Adapter Service Program Module     1    
7X-1700     Communication Adapter Group     1    
7X-1425     RS232 Cable Assembly     1    
139-4166     Data Link Cable     1    
1U-6602     Photo-Tach Group     1    
4C-4892     ORFS Fittings Group     1    
1U-5796     Pressure Differential Gauge Group     1    

Note: Always warm the hydraulic oil to a minimum temperature of 50°C (122°F) before starting the testing and adjusting procedure.

Preparation




Illustration 1g00465069

View of Electronic Service Tool that is Connected to the ET Diagnostic Connector in the Cab




Illustration 2g00465070

View of Electronic Service Tool that is Connected to the ET Diagnostic Connector in the Pump Room

Connect the Electronic Service Tool with a 7X-1700 Communication Adapter to the ET diagnostic connector with a 7X-1425 cable and a 7X-1570 cable. Either the ET diagnostic connector in the cab or the pump room may be used.

Margin Pressure Adjustment for the Hydraulic Cooling Piston Pump




    Illustration 3g00468770

    Hydraulic Cooling Piston Pump

    (1) Load sensing signal pressure port

    (2) Discharge pressure port

  1. Install 1U-5796 Pressure Differential Gauge Group between load sensing signal pressure port (1) and discharge pressure port (2). Connect the low pressure hose to the load sensing signal pressure port (1). Connect the high pressure hose to the discharge pressure port (2).

  1. Place the automatic engine speed control switch in the OFF position.

  1. Start the engine.

  1. Warm the oil to a minimum temperature of 50 °C (122 °F). Refer to the Testing and Adjusting, "General Information" for the proper procedure for warming the hydraulic oil.

  1. Set the throttle switch to position 10. Ensure that the engine speed is 1830 ± 10 rpm under a no load condition.

  1. Use the Electronic Technician in order to set the bypass setting on the hydraulic cooler fan to 100%.

  1. Note the pressure which is indicated on the pressure gauge. The margin pressure for the pump should be 2100 ± 100 kPa (305 ± 15 psi).



    Illustration 4g00468773

    Regulator Control Valve on Hydraulic Cooling Piston Pump

    (3) Adjustment screw for margin pressure

  1. If the margin pressure is not within the specification, use the adjustment screw (3) to adjust the pressure.

    1. If the margin pressure is below the specification, loosen the locknut and turn the adjustment screw (3) clockwise until the pressure reading is 2100 ± 100 kPa (305 ± 15 psi). Tighten the locknut.

    1. If the margin pressure is above the specification, loosen the locknut and turn the adjustment screw (3) counterclockwise until the pressure reading is 2100 ± 100 kPa (305 ± 15 psi). Tighten the locknut.

      Note: Always make pressure adjustments on the pressure rise.

  1. Remove the test equipment.

Maximum Speed Adjustment




    Illustration 5g00468834

    Hydraulic Cooler Fan Blade

  1. Place a piece of reflective tape on one fan blade of the hydraulic cooler fan.

    Note: Place the reflective tape as close as possible to the fan hub.

  1. Place the automatic engine speed control switch in the OFF position.

  1. Start the engine.

  1. Warm the oil to a minimum temperature of 50 °C (122 °F). Refer to the Testing and Adjusting, "General Information" for the proper procedure for warming the hydraulic oil.

  1. Set the throttle switch to position 10. Ensure that the engine speed is 1830 ± 10 rpm under a no load condition.

  1. Use the Electronic Technician in order to set the bypass setting of the hydraulic cooler fan to 0%.

  1. Use a 1U-7771 Tachometer to measure the hydraulic fan speed. The hydraulic cooler fan speed should be 950 ± 10 rpm.



    Illustration 6g00468840

    Regulator Control Valve on the Hydraulic Cooling Piston Pump

    (4) Adjustment screw for pressure compensator

  1. If the fan speed is not within the specification, use the adjustment screw (4) to adjust the speed.

    1. If the fan speed is below the specification, loosen the locknut and turn the adjustment screw (4) clockwise until the fan speed is 950 ± 10 rpm. Tighten the locknut.

    1. If the fan speed is above the specification, loosen the locknut and turn the adjustment screw (4) counterclockwise until the fan speed is 950 ± 10 rpm. Tighten the locknut.

  1. Remove the test equipment.