STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
6B
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8
V. Slewing brake
1. Manual brake release (see fig. 6-4-1)
1) Start the weather vane device:
a). Raise the brake lever (1), i.e. act A.
b). Push the button (2), and make it stay under the brake lever (1).
c). Release the brake lever (1), and make it stay on the strap clamp (3), then the brake
lever was locked by brake lever. Finally, pin the strap clamp.
d). Release the pressure on the push-button (2). No clearance is allowed between the
button and the brake release lever (1). Otherwise the operation must be carried out
again. Readjust if the clearance still remains.
e). When the weather vane effect has accomplished, the slewing mechanism should be
allowed to rotate freely.
2) Release the weather vane device
a). Raise the brake lever (1), i.e. act A.
b). Under the action of spring (4), the strip clamp (3) came out.
c). Release the brake lever (1).
d). When the weather vane effect has accomplished, the slewing mechanism should be
stand still.
Fig. 6-4-1
4
3
1
2
A
