Maintenance
85
Adjusting Gripper Holding Valve Pressure
N
OTE
:
The lifting arm gripper is equipped with holding valves. 2 cartridges are located just behind the
gripper (see Figure 3-58) [for the standard Right Hand™]. For the HD Right Hand™, cartridges
are mounted directly on the cylinders (see Figure 3-59).
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 3-58 [standard arm], or Figure 3-59 [HD arm]).
4.
CONNECT a pressure gauge to the test port on the arm and body directional control valve.
Figure 3-57 Pressure test port
5.
START the engine and ENGAGE the hydraulic pump.
6.
Using the pressure gauge on the arm and body directional control valve, ADJUST the opening
pressure of each of the gripper closing movement cartridges to 550
psi.
Arm Type
Movement
Type of Movement
Prevented
Cushioning Effect
Std & HD
In/Out
Cylinder Opening
(boom Extension)
In - Adjustable
Out - non adjustable
HD only
Up Down
Cylinder Closing
(gripper body
lowering)
Up/Down - Adjustable
Std & HD
Gripper
Cylinder Opening
(gripper closure)
None
Summary of Contents for ALLEY -GATOR RIGHT-HAND
Page 1: ...ALLEY GATOR RIGHT HANDTM MAINTENANCE MANUAL...
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Page 3: ...ALLEY GATOR RIGHT HANDTM MAINTENANCE MANUAL...
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Page 10: ...viii Table of Contents...
Page 16: ...6 Introduction...
Page 38: ...28 Safety...
Page 104: ...94 Maintenance Figure 3 69 Packer choke valve w cap w o cap Adjustment screw Valve with cap...
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