120H, 12H, 135H, 140H, 143H, 14H, 160H, 163H and 16H Motor Graders Secondary Steering System Caterpillar


Relief Valve (Secondary Steering) - Test

Usage:

120H 124
Note: Before you perform any tests, refer to the Testing and Adjusting, "Machine Preparation for Troubleshooting" section.

Table 1
Required Tools    
Qty     Part Number     Description    
1     6V-3965     Fitting As (Quick Disconnect)    
1     3J-1907     O-Ring Seal    
1     7X-0871     Tee    
1     6V-8398     O-Ring Seal    
1     8T-0860     Pressure Gauge (0 to 40,000 kPa (0 to 5,800 psi))    
1     6V-4144     Coupler    



Illustration 1g00923115

(1) Steering port

Note: Turn off the machine. Turn the steering wheel back and forth. Repeat this procedure several times. This procedure will relieve the pressurized hydraulic fluid from the steering accumulator.

  1. Remove the steering supply line from steering port (1) in the combination valve. Install the 7X-0871 Tee into port (1). Connect the steering supply line to the tee. Connect the 8T-0860 Pressure Gauge (0 to 40,000 kPa (0 to 5,800 psi)) to the tee.



    Illustration 2g00923116

    (2) Battery disconnect switch

  1. Turn battery disconnect switch (2) and the engine start switch to the ON position.



    Illustration 3g00923111

    (3) Relief valve

  1. Hold the secondary steering test switch in the TEST position until the reading of the pressure gauge stops rising. The pressure gauge should register 17225 kPa (2498 psi). This is the correct pressure setting for relief valve (3) .

  1. If the pressure reading on relief valve (3) is not 17225 kPa (2498 psi), relief valve (3) must be replaced. Relief valve (3) cannot be adjusted. Turn battery disconnect switch (2) and the engine start switch to the OFF position. Refer to Disassembly and Assembly, "Machine Preparation for Disassembly and Assembly". Replace relief valve (3) .

  1. Repeat in order to check the new relief valve (3) .

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