Tadano GR-700N, Service Manual

Page: 40 / 200

Y-4 Y-4
Air Bleeding Procedure
27
WY05-3900E
2. Winch brake
[NOTICE]

To avoid damage to the friction plates of the winch
brakes, bleed the winch brakes following the
procedures below.
1. When assembling piping, plug the piping between
the hoisting down port of each main and auxiliary
winch motor and the corresponding hydraulic pilot
control valve (main). (For plugging, attach plugs to
the pipe end closer to the hoisting down port of
each motor and the one closer to the
corresponding hydraulic pilot control valve port.)
[NOTICE]

After assembly, do not perform hoisting operation.

Hereafter, hoisting up operation by the main and
auxiliary winches is prohibited until bleeding of the
winch brakes is completed.
2. Perform hoisting down operation of each main
and auxiliary winch using the corresponding
air-bleed plug of the winch brake.
• Engine: idling
• Corresponding control lever moved fully to the
hoisting down side
(You don’t need move the winch lever to and
fro.)
• When no more bubbles come out of the plug,
bleeding is completed.
3. After bleeding of the winch brakes is completed,
remove the plugs from the piping and connection
sections, and reassemble the piping.