Tadano TR-800XXL4, Service Manual

Page: 335 / 402

Y - 3 Y - 3
Air Bleeding Procedure
13
WY05-0581E
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 (2150 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.