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Challenger 35, Challenger 45 and Challenger 55 Agricultural Tractors Implement, Steering and Brake Hydraulic Systems Caterpillar


Steering System Charge Oil Pressure Test

Usage:

45 1DR

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

Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine.

To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. 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 on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.

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Table 1
Tools Needed    
Part Number     Description     Quantity    
6V-3965     Nipple Assembly     1    
8T-0855     Pressure Gauge     1    
8T-0853     Pressure Gauge     1    
6V-3989     Unvalved Nipples     1    
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Illustration 1g00506550

(1) Charge pressure tap

(2) Plug

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    Illustration 2g00512400

    (1) Charge pressure tap

    (2) Plug

  1. Install a 0 to 4000 kPa (0 to 580 psi) pressure gauge onto charge pressure tap (1) .

  1. Remove plug (2).
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    Illustration 3g00512405

    (3) Nipple assembly

  1. Install nipple assembly (3).

  1. Attach a 0 to 400 kPa (0 to 58 psi) pressure gauge to nipple assembly (3) .

    1. This gauge will read the case pressure for the steering pump.

  1. Start the engine. Run the engine at 1400 ± 25 rpm.

  1. Warm the oil to 60°C (140°F). At least two segments should be visible on the bargraph for the hydraulic oil temperature.

  1. Record the pressures from both pressure gauges.

  1. Subtract the case pressure from the charge pressure. The charge pressure should be 2470 ± 170 kPa (358 ± 25 psi) higher than the case pressure.

  1. If the charge pressure is not correct, use the following procedure to adjust the pump charge relief valve.
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      Illustration 4g00514385

      (5) Locking nut

      (6) Adjusting screw

    1. Loosen locking nut (5) on the pump charge relief valve. The pump charge relief valve is located on the left front of the steering pump.

    1. Turn adjusting screw (6) clockwise in order to increase the charge pressure.

    1. Turn adjusting screw (6) counterclockwise in order to decrease the charge pressure.

    1. Torque locking nut (5) to 52 N·m (38.3 lb ft).

  1. If an adjustment is made, repeat Steps 5 through 8.

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