Lifting Arms 221
To adjust the gripper holding valve pressure:
1. Apply all safety measures to ensure safety around the vehicle at all times.
2. Make sure that the parking brake is applied.
3. Locate the gripper holding valves (see Figure 10-15 [standard arm], or Figure 10-16 [HD arm]).
4. Connect a pressure gauge to the automated arm valve.
Figure 10-14
Quick coupler for pressure gauge
5. Start the engine and engage the hydraulic pump.
6. Using the pressure gauge on the automated arm valve, adjust the opening pressure of each of the
gripper closing movement cartridges to 550 psi.
NOTE: Pressure reading must be done independently for each side of the gripper (single/dual finger
side). To do so, place one of the gripper cylinders in fully extended position and activate the
lever on the automated arm valve to initiate the closing movement of the other cylinder.
Proceed vice-versa for the other side of the gripper.
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