Hydraulic System 111
Figure 5-21
Relief adjustment screw
Adjusting Gripper Pressures
The section of the proportional valve that controls the gripper is the first section next to the inlet
cover, and it is equipped with a built-in relief valve that allows for gripper pressure adjustment
(see Figure 5-23).
To adjust the gripper pressures:
1. Lock out and tag out the vehicle (see Locking Out and Tagging Out the Vehicle on page 20).
2. Secure the area around the path of the arm with barrier tape or barricades.
3. Move the levers back and forth to release any residual pressure.
4. Make sure that all hoses are tight and not leaking.
5. Connect a pressure gauge (0–4000 PSI) to the quick-connect coupler on the proportional valve
(see Figure 5-22).
Danger!
Do not stand directly in the path of the arm while carrying out these adjustments.
Main relief valve
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