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Operator’s Manual for Crawler Crane
Crane
Operation
4-46
4.5.6 Operation of crane winches
4.5.6.1 Hoisting winches
a) Components of hoisting winch
The hoisting winch consists of hydraulic motor, winch reducer, brake, lowering limiter,
hoisting limiter, wire rope, main and auxiliary load hooks etc.. The lifting speed of load can
be changed by adjusting the inclination angle of control lever. The bigger the inclination
angle is, the quicker the lifting speed is.
b) Operation of hoisting winch
The crane is fitted with three hoisting winches: hoisting winch 1, hoisting winch 2 and
hoisting winch 3. All of them have three working speeds: inching speed, normal speed and
high speed.
Move the control lever forwards to lower the winch, and move it backwards to raise the
winch.
1) Inching-speed operation: press inching speed switch, and then move control lever.
2) Normal-speed operation: only move control lever.
3) High-speed operation: press high speed switch, and then move control lever.
CAUTION
(1) Choose proper rope reeving in accordance with boom length.
(2) If the hoisting rope tangles, the operator can not operate the crane to lift the load.
Only after the hoisting rope is undone, can the load be lifted.
(3) Under any conditions, there must be at least three windings of wire rope left on the
winding drum.
(4) When a load is lifted away off the ground, it should first be suspended in the air for a
moment. Do not lift the load until the operator confirms that there is no safety
hazard. Do not lift the load with boom if the load is still in contact with the ground.
(5) Do not change control lever between “lift hook” and “lower hook” jerkily. The
operator must return the control lever to neutral position and ensure that the
winding drum has stopped before changing control lever from “lift hook” to “lower
hook”. Otherwise, the machine will be damaged.
(6) If the main boom length is extended in “main boom” configuration, the lifting height
of the crane will increase accordingly, which will therefore make the wire rope not
be long enough. Such problem can be solved by changing the rope reeving of wire
rope. Before changing the rope reeving, fit a hoisting limit switch weight.
When the crane is overloaded, or wire rope on hoisting winch is excessively wound
/ unwound, the dangerous movements will be switched off automatically and an
alarm will be given out.
For reference only.
Operators manual should be consulted and adhered to.