STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
8B
-
6
3. Adjustment
Adjustment must be carried out with no load. Operate the “left slewing” or “right
slewing”, and operate the contact A manually, so as to confirm the contact which
cutting off the controlling motion.
a). Adjusting the right slewing limiter (SRD): Slewing the jib, it can prevent the
electric cables from twisting, make one and a half cycles slewing to the right, then
adjust cam (4) and check up its motion, until it depresses the corresponding contact
(5).
b). Adjusting the left slewing limiter (SRG): Make three cycles slewing in the reverse
direction. Then adjust the cam (6), until it depresses the contact (7).
Note:
The above-mentioned adjustments should be checked everyday before the
tower crane putting into service.
Each time when transferring the tower crane to a new site and before putting into
service, it is essential to remove the plug which located at the lower part of limiter,
and drain the condensation water in it. The plug must be installed before transferring
to a new site.
