Manitowoc Published 10-01-12, Control # 044-05 4-31
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
Remove Crawlers
See Figure 4-18 for this procedure unless otherwise noted.
1. If required for transport, remove steps from both
crawlers (View B).
2. Perform following steps at both drive shafts:
a. Unpin drive shaft guard (View C) and slide guard
back.
b. Remove flange screws from drive shaft flange (View
D).
c. Retract crawler drive shaft and place drive shaft on
supporting bracket (View E).
d. Remove keeper pins and collars from crawler
connecting pins (View C). Use handle on front of
carbody to retract pins.
3. Position each carbody jack as follows:
a. Remove connecting pin 1 (Figure 4-5, View A).
b. Rotate jack out and install connecting pin 1
(Figure 4-5, View B).
c. Remove connecting pin 2 (Figure 4-5, View A).
d. Rotate jack down and install connecting pin 2
(Figure 4-5, View B).
4. Remove jack pads from storage position (Figure 4-5,
View C) and connect jack pad to each jack rod with
U-shaped pin (Figure 4-5, View B).
5. Using controls on front of carbody (Figure 4-5, View A),
extend carbody jacks until crawler treads are just clear
of ground.
NOTE: A 2-way level is provided near controls on front of
carbody (Figure 4-5, View D).
6. Attach three hooks from chain sling to lifting lug on
inboard side of crawler and lifting links on outboard side
of crawler (View A).
Position boom and rotating bed so assembly block is
centered over crawler. Crawler can bind on carbody if
crawler is not hoisted vertically.
7. Slowly hoist crawler to disengage hooks on crawler from
fixed pins on carbody wings (View G).
8. Lift crawler onto trailer (View F).
9. Engage crawler connecting pins and install collars and
keeper pins (View C).
10. Unhook chain sling from crawler.
11. Swing over other side.
12. Repeat steps 6 through 10 for other crawler.
DANGER
Tipping Hazard!
Prevent crane from tipping over:
• Make sure crane is level. Check 2-way level on front
of carbody. Adjust jacks as required.
• Do not exceed 15 ft (4.6 m) radius while lifting either
crawler.
CAUTION
Parts Damage!
Avoid hitting carbody jacks with crawlers.
DANGER
Rotating Drive Shaft Hazard
Crawler drive shafts rotate at high speed. To prevent
death or serious injury:
• Do not attempt to disconnect drive shafts until crane
has been parked and engine stopped.
WARNING
Moving Part Hazard!
Avoid serious crushing injury:
• Warn all personnel to stand clear of jacks.
Tipping Hazard!
Avoid tipping crane over:
• Keep crane level while jacking.
DANGER
Tipping Hazard!
Do not allow assembly block to swing past inside edges of
carbody jacks (Figure 4-19) while removing first crawler.
Crane will tip.
FIGURE 4-19
da0102.ai
45°
45°
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