Manitowoc Published 12-10-19, Control # 258-05 4-81
MLC90A-1/MLC100-1 OPERATOR MANUAL SETUP AND INSTALLATION
Retract Crawlers
See Figure 4-50.
NOTE The crawlers must be retracted one at a time.
1. Perform the following steps at each carbody extension
for one of the crawlers (4W, View B).
2. Thoroughly clean and spray the sliding surfaces of the
carbody extension and the crawler with a quality brand
of dry film moly multipurpose lubricant.
3. Inspect the shims each time they are removed:
• If a shim is damaged or difficult to remove, replace
it.
• Measure the gap between the shims and crawler.
The gap must be 1 to 3 mm (0.04 to 0.12 in).
4. Remove the shims (7W, View C, four places) from the
working position and install them in the stored position
(7S).
• It may be necessary to swing the upperworks to
increase the clearance between the crawler and
carbody so the shims can be removed.
• Alternatively, holding the crawler positioning switch
in the extend position will cause the crawlers to tip
slightly, thereby providing more clearance.
NOTE The shims and the carbody legs are stamped with
matching identification numbers (8, View C). Do not
interchange the shims. The number on each shim
must match the number on the corresponding
carbody leg.
5. Remove the locking pins (3, View B) from the working
position.
6. Using the crawler positioning switch on the right console
in the cab, retract one crawler (with the other crawler
pinned in a fixed position).
Depending on ground conditions:
• It may be necessary to swing
• It may be necessary to travel slowly in either
direction
7. Store each carbody extension (4, View A):
a. Remove the stop block (2W).
b. Swing the carbody extension (4) inward 90°.
c. Reinstall the stop block (2S).
d. Secure the carbody extension to the crawler with
the locking pin (3).
8. Repeat steps 1-7 for the other crawler.
WARNING
Tipping Hazard!
Do not attempt to retract (or extend) the crawlers with the
crane counterweight installed. Tipping will occur if the
crane is swung in either direction.
Crush Hazard!
To avoid crushing personnel while retracting the crawlers,
maintain constant communication (signals) between the
operator and ground personnel.
Do not extend/retract crawlers or swing while personnel
are standing between the crawlers.