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4.11.4 WINCH VENTING
[1] Winch motor air venting
Before loosening and tightening the air venting plug of winch motor, be sure to allow the hook block
to touch the ground and set the work machine operation lever to "NEUTRAL" position. Otherwise,
the internal pressure may force the plug or oil to jet out.
CAUTION
･
Conduct the air venting of winch motor thoroughly. Insufficient air venting will hinder smooth
operation of the motor at its start.
･
Securely tighten the air vent plug. If it is loosened, the brake could not be cancelled. Also, it may
give rise to oil leakage.
[2]
Air venting in mechanical brake
1. Allow the hook block to touch the ground, and return the right work
machine operating lever to "NEUTRAL" position.
2. Loosen the mechanical brake air vent plug (1) by 3 to 4 turns.
3. While keeping the Machine without hoisting load, perform the
operation of slowly winding up the hook block, stopping and winding
down.
4. If hydraulic oil is oozing out from air vent plug (1) of the mechanical
brake, stop the winch operation and securely tighten the air vent plug
(1).
★ Tightening torque: 12.3 N•m (1.25 kgf•m)
[3]
Air venting in counter balance valve
1. Allow the hook block to touch the ground, and return the right work
machine operating lever to "NEUTRAL" position.
2. Loosen the air vent plug (2) for the counter balance valve by 3 to 4
turns.
3. While keeping the Machine without hoisting load, perform the
operation of slowly winding up the hook block, stopping and winding
down.
4. If hydraulic oil is oozing out through the air vent plug (2) for
counterbalance, allow the hook block to touch the ground and return
the right work machine operation lever to "NEUTRAL" position.
5. Securely tighten the air vent plug (2).
★ Tightening torque: 12.3 N•m (1.25 kgf•m)
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