Lifting Arm 201
To adjust the arm speed:
1. Secure the area around the path of the arm with barrier tape or barricades.
2. Put the transmission in Neutral.
3. Start the engine and engage the hydraulic system.
4. Clearly identify the stopper screw on the valve that corresponds to the proper function (arm
extension/retraction, gripper open/close).
5. Move the lever to evaluate the arm speed, then release the lever.
Make sure the Speed-Up feature is activated. The engine speed should be at 1200 RPM (except
for units that work at idle).
6. Loosen the locknut.
7. Turn the restrictor adjustment screw only one eighth (1/8th) of a turn at a time to see a
significant change in the arm speed.
8. Move the lever again to evaluate the arm speed. Repeat until the cycle times are properly set (see
table below).
9. Retighten the locknut.
Danger!
Do not stand in the path of the arm while carrying out these adjustments.
Caution!
When adjusting the tilt movement speed, make sure the auto-closing feature allows the
gripper to close sufficiently to avoid the gripper fingers hitting the hopper walls.
Table 1 Arm Operating Pressure and Cycle Times (engine speed at 1200 RPM)
Arm function Pressure setting (PSI) Cycle time (sec.)
Arm extend System pressure 5.0 (min.) - 5.5 (max.)
Arm retract System pressure 3.0 (min.) - 3.5 (max.)
Arm up System pressure 3.0 (min.) - 3.5 (max.)
Arm down System pressure 3.0 (min.) - 3.5 (max.)
Gripper close 1200 ± 50 1.0 (min.) - 1.5 (max.)
Gripper open 1200 ± 50 1.3 (min.) - 1.8 (max.)
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