8146-A, 6-29-99/L
Page 1 of 3
2250 SERIES 2
Luffing Jib
Raising Procedure
For Combinations Requiring Outside Assist
Luffing Jib No. 133 or No. 133A On
Boom No. 44 with Heavy Lift Top
Manitowoc Cranes, Inc.
Manitowoc, Wisconsin 54220 U.S.A.
Recommended boom and luffing jib raising and lowering procedure
using jack-knife method with outside assist
2250 SERIES 2 equipped with 209,200 Lb. (94 890 kg) crane counterweight and 60,000 Lb. (27 220 kg) carbody counterweight
requires outside assist when raising and lowering boom and luffing jib combinations shown in outside assist table.
WARNING: User must exercise extreme caution when raising and lowering these boom and luffing jib combinations because their
length exceeds that which may be raised without outside assistance. During raising and lowering boom and luffing
jib combinations, it is very important to follow instructions carefully. A successful operation depends entirely on
personnel and outside assist equipment performing the task. Danger tag No. 147841 shall be mounted in crane cab in
clear view of operator, warning that boom and luffing jib combinations may not be raised or lowered without outside
assist.
Crane Preparation
A. Boom and Luffing Jib Rigging
Refer to luffing jib rigging No. 194186 and No. 192086 for make-up of inserts, straps, pendants, and miscellaneous parts, etc.
Lower boom point requires only the middle 3 sheaves to be used. All other sheaves must be removed from lower boom point.
B. Position and Block Crawlers
Lift must be made over front of blocked crawlers. Machine to be in a level position on a firm and uniformly supporting
surface with gantry up and front tumbler properly blocked so that centerline of idler tumbler becomes tipping fulcrum. Travel
drive must be to rear of machine.
C. Attach Lifting Bracket and Hook
Attach lifting bracket to main strut at location shown on luffing jib rigging No. 194186. Attach hook from assist crane to
lifting bracket.
D. Assist Crane
Assist crane must carry entire load of boom and luffing jib and have capacities of at least those shown in outside assist table
when raising or lowering boom and luffing jib. Assist crane should operate at approximately 75 - 80 degree boom angle.
Recommended assist crane boom lengths may vary depending on type and placement of crane and skill of operator.
E. Assist Crane Position
To raise or lower boom and luffing jib, assist crane should be in a level position on a firm uniformly supporting surface with
crawlers parallel to boom and luffing jib. Assist crane upperworks should face in direction of 2250 SERIES 2 boom top.
Assist crane should hoist and crawl simultaneously in order to keep hoist line vertical. Also, hoist line of assist crane must not
put any side load into main strut.
