Manitowoc MLC165 Quick Start Manual

Luffing Jib Raising Procedure
MLC165
Luffing Jib No. 135 on Boom No. 74
Recommended boom and luffing jib raising and lowering procedure
MLC165 SERIES 1 must be equipped with 99,500 lb crane counterweight and 0 lb carbody counterweight; MLC165
SERIES 2 must be equipped with 121,500 lb crane counterweight and 35,300 lb carbody counterweight. Refer to luffing
jib rigging assembly No. 81022481 for boom and luffing jib make-up of inserts, pendants, struts, strut raising and
lowering procedure, jib stop setup and operation and miscellaneous parts, etc. Refer to Operator's Manual for setup and
installation.
Boom and luffing jib combinations must be raised and lowered using jack-knife method.
Caution: Anytime luffing jib point rollers are in contact with ground during raising or lowering procedure, disengage
swing lock if equipped, and release swing brake.
Raising:
Luff up jib strut to keep luffing jib strut off luffing jib during boom raising. Slowly raise boom while luffing jib point wheels
are allowed to roll on ground. When luffing jib stop strut is just clear of ground, attach luffing jib stop pendants and unpin
luffing jib stop inner strut from retracted position. Slowly raise boom until luffing jib stop strut is fully extended and pins
engaged (approximately 168 degree boom-to-luffing jib angle). Continue to boom up with luffing jib wheels rolling on
ground until boom-to-luffing jib angle reaches value specified in Tables 1 and 2 or vertical, whichever occurs first.
Tighten luffing jib suspension with luffing jib hoist. Boom and luffing jib are then raised together using boom hoist until
boom reaches desired boom operating angle. Luffing jib radius must be within capacity chart before swinging over side
of machine when raising over front of blocked crawlers.
Lowering:
Position boom at 85 degrees prior to lowering luffing jib. Lower luffing jib until boom-to-luffing jib angle reaches value
specified in Tables 1 and 2. Lower boom until luffing jib point wheels contact ground. If luffing jib is hanging vertical, raise
luffing jib a few degrees forward of vertical. Continue to lower boom while luffing jib wheels roll along ground. Keep
enough tension on luffing jib hoist to keep luffing jib strut off luffing jib. Stop lowering boom when luffing jib stop pendants
start to go into tension (approximately 168 degree boom-to-luffing jib angle). Disengage luffing jib stop strut pins and
lower boom to retract luffing jib stop inner strut. Pin strut in retracted position.
Caution: Do not under any condition allow boom to luffing jib angle to become less than 60 degrees.
Manitowoc Cranes 9304-A, 2015-11-09
Manitowoc, Wisconsin 54220 U.S.A. 1/3