STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
5B-7
（
Ⅱ
）
. Adjusting air clearance of brake as following:
1. takeoff cover cap (40);
2. Loosening the nut (39) and (45), adjusting the distance between yoke iron of
electromagnet (47) and gag bit (59) is 0.7
－
0.8mm. the clearance tolerance
around is less than 0.05mm
，
After tighten up the nut (39) (45) should check
the clearance dimension to accord with the demand. when operation adjust
again and again.
（
Ⅲ
）
. exchange the friction disk as following:
1. Takeoff cover cap; (40)
2. screw off the nut; (45)
3. Takeoff electromagnet; (47)
4. screw off nut (39) (37);
5. Takeoff sprig (35);
6. Takeoff gag bit (59);
7. Takeoff brake holder block (33);
8. when it is fitting cleanup the raffle and dust of each parts surface.
（
（
（
（
Ⅳ
Ⅳ
Ⅳ
Ⅳ
）
）
）
）
. declutch method of machinery:
In good running, the adjustment cover (55) of the brake end should in loosening
condition, not to be tightly, in special condition, such as power cut, damage the
motor, can declutch automatically and put the hook on the ground as following
method:
Takeoff the pin (54), plate (53), tighten up the adjustment cover (55) to the hook
fall off.
