Raising Boom And Jib - Manitowoc 18000 Operator's Manual

18000 OPERATOR MANUAL

RAISING BOOM AND JIB

See Figure 4-32 for the following procedure.
1. Read and adhere to raising and lowering limitations
given in Liftcrane Fixed Jib Capacities Chart.
2. Raise boom until lower jib point is just clear of blocking.
NOTE For long boom-short jib combinations, weight of
backstay straps may prevent the jib from rotating
down to its proper operating position when boom is
raised. If this happens, you will not be able to pin jib
stop locking pins in step 3. Take the following
corrective action:
- Attach slings from assist crane to straps
midway between points shown in
- Hoist with assist crane until jib rotates down to
its proper operating position.
3. Adjust jib stops:
a. Remove jib stop locking pin (5, View B).
Manitowoc
b. Turn each adjusting rod (4, View C) until appropriate
holes for desired jib offset are aligned (View B).
-
-
If it is difficult to turn adjusting rod (4), lift strut stop at
location (6) shown in View B
c. Insert jib stop locking pins (5) in appropriate hole for
jib offset.
d. If necessary, disconnect assist crane from backstay
straps.
4. Pin upper jib point to jib top:
a. Slowly continue to boom up until lower connecting
Figure 4-32.
holes in jib top and upper point (7) are aligned (View
A).
b. Insert pins (8). Retain with cotter pins.
5. Continue to raise boom and jib to desired operating
position.
Published 12-05-17, Control # 032-23
SET-UP AND INSTALLATION
Hole A for 5° offset
Hole B for 20° offset
4
4-57