Labrie MINIMAX, Maintenance Manual

Page: 170 / 174

162 Lifting Arm
Figure 10-10 Fittings to loosen
4.
Using the lever on the arm control valve, fully extend the gripper cylinder in order to close the
blades.
5.
Loosen (
do not disconnect
) the piston side cylinder fitting and let the air out of the circuit
(see Figure 10-10, Fitting A).
6.
As soon as a constant and uniform oil flow (without the appearance of air bubbles) is leaking out,
tighten the fitting. Keep the hydraulic function engaged until the fitting is tightened.
7.
Loosen (
do not disconnect
) the rod side cylinder fitting and let the air out of the circuit.
8.
Fully retract the gripper cylinder in order to open the blades (see Figure 10-10, Fitting B).
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 161.
2.
Using the lever on the arm control valve, fully extend the rail cylinder of the arm.
3.
Loosen ( do not disconnect ) the piston side cylinder fitting and let the air out of the circuit
(see Figure 10-10, Fitting C).
4.
As soon as a constant and uniform oil flow (without the appearance of air bubbles) is leaking out,
tighten the fitting. Keep the hydraulic function engaged until the fitting is tightened.
5.
Loosen ( do not disconnect ) the rod side cylinder fitting and let the air out of the circuit (see Figure
10-10, Fitting D).
6.
Fully retract the rail cylinder of the arm.
7.
Repeat step number 4.
Cylinder Cushion Adjustment
The In/Out and Up/Down cylinders are cushioned at the end of their strokes to give a smoother
movement. The cushioning speed is adjustable directly on the cylinders using two cushion screws. If
the grabber or the arm hits hard at the end of its strokes, apply the following procedure.
Fitting A Fitting B Fitting D Fitting C
In/Out circuit Gripper circuit