Challenger 65E, Challenger 75E, Challenger 85E and Challenger 95E Agricultural Tractors Implement, Steering and Brake Hydraulic Systems Caterpillar

Illustration 1	g00573280
Steering Lines (1) Pressure tap

Note: Use the steps on the left side of the machine to gain access to pressure tap (1) .

1. Put a 0 to 4000 kPa (0 to 580 psi) pressure gauge on a 6V-3081 hose .

2. Connect the hose and gauge to pressure tap (1) .

3. Start the engine and run the engine at maximum speed.

4. The reading on the pressure gauge should be a minimum of 1375 kPa (200 psi).

   Note: Pump case drain pressure adds to the value in Step 4 if the drain is blocked. Case pressure should be less than 69 kPa (10 psi).

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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.

5. Stop the engine.

6. Move the hydraulic control levers to all positions in order to release the pressure in the implement hydraulic system.

7. Carefully loosen the filler cap on the hydraulic tank in order to release the pressure in the tank.

8. Be sure that you release the system hydraulic pressure before you:
   • Loosen or tighten a fitting, a hose, or a component.

   • Remove a fitting, a hose, or a component.

   • Make any adjustments.

9. Fully depress the brake pedal. Depress the pedal several times in order to release the hydraulic pressure that is stored in the brake accumulator.

10. Tighten the filler cap on the hydraulic tank.

11. The pressure in the system has now been released and lines or components can be removed.

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Illustration 2	g00577045
Steering Motor (typical example) (1) Blocking plate (left side) (2) Blocking plate (right side)

12. Block the ports on the steering motor and turn the steering wheel to the left and to the right. Read the pressure gauge. The charge pressure (boost pressure) should stay within the range.

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NOTICE
Do not put the steering system in a stall condition for more than 15 seconds at a time. After 15 seconds excessive heat will be generated in the steering system.

13. If the oil pressure is not correct, loosen the locknut on the pilot oil relief valve. Adjust the screw on the top of the valve. (The pilot valve is located on the right rear corner of the steering pump.)

    1. Turn the screw clockwise in order to increase the pressure. Turn the screw counterclockwise in order to decrease the pressure.

    2. Tighten the locknut to a torque of 52 N·m (38 lb ft).

14. If an adjustment is made, repeat Steps 3 and 4 in order to verify the adjustment.

15. Follow the procedure to release the system pressure before you remove the blocking plates.