Manitowoc Published 10-01-12, Control # 044-05 4-11
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
Install Crawlers
See Figure 4-6 for following procedure unless otherwise
indicated.
1. Position trailer with crawler along desired side of crane
(View A).
NOTE: Make sure drive shafts are positioned at the rear of
the carbody (opposite carbody controls).
2. Remove keeper pins and collars from crawler
connecting pins (View E). Use handle on carbody
remote control to retract pins.
3. Attach three hooks from chain sling to lifting lug on
inboard side of crawler and lifting links on outboard side
of crawler (View A).
4. Slowly hoist crawler clear of trailer and remove trailer.
5. Slowly lower crawler, boom up, and swing to engage
hooks on crawler with fixed pins on carbody wings
(View B).
6. STOP lowering and booming when crawler hooks are
engaged with fixed pins and connecting holes are
aligned (View B).
7. Engage crawler connecting pins with holes and install
collars and keeper pins (View E).
8. Lift crawler drive shaft off supporting bracket (View C),
extend shaft, and align holes in drive shaft flanges
(Views C and D).
9. Insert flange screws and torque to 74 ft-lb (100 N-m)
(View D).
10. Slide drive shaft guard over drive shaft (View E) and pin
guard to carbody.
11. Unhook chain sling from crawler.
12. Swing over other side.
13. Repeat steps 1 through 10 for other crawler
14. Slowly rotate crawlers (travel forward and back) to
center treads on rollers.
15. Lower carbody until crawlers are on ground. KEEP
CRANE LEVEL. Then fully retract jacks.
16. Remove jack pads and store (Figure 4-5, View C).
17. Position each carbody jack as follows:
a. Remove connecting pin 2 (Figure 4-5, View B).
b. Rotate jack up and install connecting pin 2
(Figure 4-5, View A).
c. Remove connecting pin 1 (Figure 4-5, View B).
d. Rotate jack in and install connecting pin 1
(Figure 4-5, View A).
18. Install step (Figure 4-6 View F) at front and rear inboard
side of both crawlers.
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 (Figure 4-7).
CAUTION
Parts Damage!
Avoid hitting carbody jacks with crawlers.
WARNING
Rotating Drive Shaft Hazard
Crawler drive shaft rotates at high speed. To prevent
death or serious injury:
• Make sure drive shaft is securely attached at both
ends.
• Make sure guards are in place and securely attached
at both ends during operation.
• Do not attempt to service drive shaft until crane has
been parked and engine stopped.
DANGER
Tipping Hazard!
Do not allow assembly block to swing past inside edges of
carbody jacks (Figure 4-7) while installing second crawler.
Crane will tip.
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