Manitowoc Published 12-10-19, Control # 258-05 4-17
MLC90A-1/MLC100-1 OPERATOR MANUAL SETUP AND INSTALLATION
Extend Crawlers
See Figure 4-10.
NOTE The crawlers must be extended one at a time.
1. Perform the following steps at each carbody extension
for one of the crawlers (4, View A):
a. Thoroughly clean and spray the sliding surfaces of
the carbody extension and the crawler with a quality
brand of dry film moly multipurpose lubricant.
b. Remove the stop block (2S).
c. Remove the locking pin (3).
d. Swing the carbody extension (4) outward 90°.
e. Reinstall the stop block (2W) in the working position.
f. If there is sufficient space on the jobsite, swing the
upperworks so that the boom butt is over the crawler
that has been prepared for extension.
2. Using the crawler positioning switch on the right console
in the cab, extend 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
3. Stop extending the crawler when the alignment pins (5,
View B) are engaged in the guide pockets of the crawler
(1) frames.
4. Install the locking pins (3, View B) in the working
position.
5. Remove the shims (7S, View C, four places) from the
stored position.
6. Lubricate the shims with a quality brand of dry film moly
multipurpose lubricant to prevent seizing.
7. Install the shims (7W, View C) in the working position.
• It may be necessary to swing the upperworks to
increase the clearance between the crawler and
carbody so the shims can be installed.
• Alternatively, holding the crawler positioning switch
in the extend position will cause the crawlers to tip
slightly, thereby providing more clearance.
The shims must be installed at the proper carbody beam
as indicated by the identification letters:
• LF = Left front
• LR = Left Rear
• RF = Right front
• RR = Right rear
The arrow (9, View C) on the left front carbody beam
indicates the FRONT of the carbody.
Do not interchange the shims. They must be installed at
the proper carbody beam.
8. Inspect the shims each time they are installed:
• If a shim is damaged or difficult to install, replace it.
• Measure the gap between the shims and crawler.
The gap must be 1 to 3 mm (0.04 to 0.12 in).
9. Repeat steps 1-8 for the other crawler.
10. Once the crawlers are extended and pinned, thoroughly
clean all four sides of the carbody beams at the locations
indicated in View D and spray them with a quality brand
of dry film moly multipurpose lubricant.
WARNING
Crush Hazard!
To avoid crushing personnel while extending 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.
WARNING
Tipping Hazard!
Do not attempt to extend (or retract) the crawlers with the
crane counterweight installed. Tipping will occur if the
crane is swung in either direction.
CAUTION
Avoid Carbody/Crawler Damage!
Failing to install the shims as instructed in the following
steps can result in structural damage to the carbody and/
or crawlers.