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


Steering System Check

Usage:

45 1DR

  • Move the machine to an area so that the machine can be raised off the ground.

    1. Raise the machine so that both belts are 20 to 30 cm (8 to 12 inch) off the ground.

    1. Check the charge oil pressure. Make sure that the pressure is 2470 ± 170 kPa (358 ± 25 psi). Refer to Systems Operation/Testing and Adjusting, "Steering System Charge Oil Pressure Test".

    1. Mark each drive wheel so the revolutions can be counted.

    1. Engage the parking brake.

    1. Start the engine. Run the engine at high idle.

    1. Warm the oil to 60°C (140°F).

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

    1. Rotate the steering wheel to the FULL RIGHT TURN position.

      1. Hold the steering wheel in this position.

    1. Count the number of revolutions of each drive wheel in one minute.

      1. The difference in the revolutions should be between 30 and 34 revolutions.

    1. Check the pilot valve oil pressure.

      1. The pressure reading should be at least 1375 kPa (200 psi).

    1. Check the steering pump oil pressure.

      1. The pressure reading should be less than 10000 kPa (1450 psi). Refer to Systems Operation/Testing and Adjusting, "Steering Pump High Pressure Cutoff Pressure Test" for the locations of the pressure taps.

    1. Rotate the steering wheel to the FULL LEFT TURN position.

      1. Hold the steering wheel in this position.

    1. Repeat Steps 10 through 12.

    1. If the measurements from Steps 10 and 12 are not within specifications, there is excessive leakage in the system.

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