
QAY220 All Terrain Crane Operation Manual
7-4 Auxiliary winch circuit
Max. pump displacement is 280 ml/r,
constant motor displacement is 160 ml/r.
The winch brake for winch circuit is
constant-closed type. The brake fluid is supplied
from the load ports on both ends of the motor,
and a pressure signal led out via shuttle valve
is feedback to hydraulic control change valve.
When operate the pilot control lever to control
the auxiliary winch, the main oil circuit ports
A and B make hydraulic control change valve
change flow direction. Main circuit pressure
decompressed (max. 3MPa) is used for opening
winch brake, thus normal winding or unwinding
operations may be performed.
When the pilot control lever returns to
neutral, the hydraulic control change valve is
reset by the action of spring force, as a result,
the pressure oil in winch brake returns into oil
tank through hydraulic control change valve, the
brake is activated by the spring.
Do not adjust the pressure valve on the
motor.
7-4
Hydraulic system
Chapter 7
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