8146-A, 6-29-99/L
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Manitowoc Cranes, Inc.
Manitowoc, Wisconsin 54220 U.S.A.
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
Raising and lowering boom and luffing jib
A. Raising Boom and Luffing Jib
WARNING: To prevent tipping it is of utmost importance to assist boom and luffing jib to angle shown in table.
2250 SERIES 2 will be within 85% of machine moment over front of blocked crawlers at this angle.
2250 SERIES 2 boom hoist must lift only to extent of maintaining a slight sag in boom rigging as boom and luffing jib are
being raised slowly and cautiously with assist crane. Slowly raise boom with assist crane until jib stop strut is just clear of
ground. Unpin jib stop inner strut from retracted position and attach jib stop pendants. Slowly raise boom with assist crane
until jib stop strut is fully extended and pins engaged (approximately 168 degree boom to luffing jib angle).
Boom is then raised with assist crane while jib point roller is allowed to roll on ground. Tension should be applied to luffing
jib hoist to keep jib strut off luffing jib during boom raising.
Continue to raise boom until boom to luffing jib angle reaches 60 degrees or luffing jib hangs vertical. Tighten luffing jib
suspension with luffing jib hoist. Continue to raise boom and luffing jib simultaneously with assist crane until boom angle is
at or above angle shown in table. Tighten boom rigging using 2250 SERIES 2 boom hoist. Unhook assist crane. Boom and
luffing jib are then raised together using 2250 SERIES 2 boom hoist until boom reaches desired operating angle. Luffing jib
radius must be within capacity chart before swinging over side of machine.
Load blocks, hook and weight ball, etc. must remain on ground until boom and luffing jib are raised to maximum radius
shown on capacity chart for which there is a capacity adequate to handle them.
CAUTION: Do not under any condition allow boom to luffing jib angle to become less than 60 degrees.
B. Lowering Boom and Luffing Jib
WARNING: To prevent tipping it is of utmost importance that the boom not be lowered beyond angle shown in table until
assist crane has taken over.
Set load blocks, hook and weight ball on ground before lowering boom and luffing jib to ground.
With boom at 83 degrees or greater, lower luffing jib until boom to luffing jib angle reaches 60 degrees. Lower boom with
2250 SERIES 2 boom hoist until boom angle is at or slightly above angle shown in table. Luffing jib point rollers may contact
ground on some combinations.
Attach hook from assist crane to lifting bracket when outside assist angle is reached. Lower boom (with assist crane on some
combinations) until luffing jib point rollers contact ground. 2250 SERIES 2 boom hoist must pay out wire rope to maintain a
slight sag in boom rigging when assist crane is attached as boom and luffing jib are lowered slowly and cautiously. If luffing
jib is hanging vertical when jib point rollers contact ground, raise luffing jib a few degrees forward of vertical with luffing jib
hoist.
Continue to lower boom with assist crane while luffing jib point roller rolls along ground. Keep enough tension in luffing jib
hoist to keep jib strut off luffing jib. Stop lowering boom when jib stop pendants start to go into tension (approximately 168
degree boom to luffing jib angle). Disengage jib stop strut pins and lower boom to retract jib stop inner strut. Pin strut in
retracted position and unpin jib stop pendants. Rotate jib stop struts forward and lower boom and luffing jib to ground.
Unhook assist crane.
CAUTION: Do not under any condition allow boom to luffing jib angle to become less than 60 degrees.
