Lifting Arms 219
Gripper hydraulic circuit
This subcircuit includes two cylinders (bore 1 ½ in., stroke between 5 and 7 in.) a holding valve and a
flow divider valve. It controls the open/close motion of the gripper in order to grip containers.
In/Out hydraulic circuit
This subcircuit includes two cylinders (bore 1 ½ in., stroke 54 in.) and a holding valve. It controls the
extend/retract motion of the arm in order to reach containers and come back close to the truck for
travelling.
Up/Down hydraulic circuit
This subcircuit includes one cylinder (bore 3 in., stroke 15 ¾ in.) and a holding valve. It controls the
lift/lower motion of the arm in order to empty the container in the hopper and bring it back down.
To bleed the gripper circuit:
1. Apply all safety measures to ensure safety around the vehicle at all times and make sure to have
enough room to fully operate the arm and gripper.
2. Make sure that the parking brake is applied.
3. Park the arm against the hopper wall, move the gripper to lower position and fully open the
gripper.
4. Loosen (do not disconnect) fitting number 2 (see Figure 10-13).
Figure 10-13
Fittings to loosen
5. Using the joystick or the lever on the proportional valve, fully extend the gripper cylinders in
order to close the fingers.
6. As soon as a constant and uniform oil flow (without air bubbles) is leaking out, tighten the fitting.
Keep the hydraulic function engaged until the fitting is tightened.
7. Loosen (do not disconnect) fitting number 1.
8. Fully retract the gripper cylinders in order to open the fingers.
9. Repeat step number 6.
To bleed the In/Out circuit:
1. Repeat steps 1 through 3 of the gripper circuit bleeding procedure on page 219.
2. Loosen (do not disconnect) fitting number 3 (see Figure 10-13).
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