Tadano TT-800XXL1, Service Manual

Page: 230 / 267

4
WY05-0740E
Y-2 Y-2
Air Bleeding Procedure
4. Winch circuit (main and aux.)
[NOTICE]
Bleed the main and auxiliary winch circuits by
following the procedures below. The procedures are
common to the both circuits.
4. 1 Winch motor
Bleed the winch motor by following either ( 1 ) or (2).
( 1 ) Pour the hydraulic oil through the drain port into
the casing until the oil flows out.
(2) Perform the slow hoist-up or hoist-down
operation for approx. 1 minute.
4.2 Winch counterbalance valve
Repeat the slow hoist-up and slow hoist-down
operations, while increasing the engine speed
gradually to the maximum (2
1 50 min
- 1
) until no more
air bubbles come out of the air bleeder screw.
4.3 Winch brake release circuit
Repeat the slow hoist-up and slow hoist-down
operations with the engine idling until no more air
bubbles come out of the air bleeder screw.
5. Jib lock pin and jib offset cylinder
[NOTICE]
Bleed the jib lock pin, jib offset cylinder by following
either ( 1 ), (2), or (3).
( 1 ) Start the engine, turn the PTO switch on, and
raise the engine speed to approx. 2, 1 50 rpm.
(2) Attach a hose to the bleeder screw (A).and
loosen the bleeder screw. In this condition, repeat
the rapid jibset operation to the retract or the
extend until no more air bubbles come out of the
air bleeder screw.
Air bleeder plug
IWY05-0580E02
Air bleeder plug
(A) (B)
(C)
(D)
Jib lock pin
Jib offset cylinder
[NOTICE]
Bleed in the order of bleeder screws, (A), (B), (C)
and (D).
(3) After air-bleeding is over, fasten the bleeder
screw and remove the hose.