7826-B, 9-26-03/GA
Page 3 of 4
888 SERIES 2Luffing Jib Raising Procedure
Fixed Jib No. 138 On Luffing Jib No. 135 On Boom No. 22EL
Manitowoc Cranes, Inc.
Manitowoc, Wisconsin 54220 U.S.A.
C. Layout Jack-Knife Method With Fixed Jib Attached Before Luffing Jib Lift-Off
Raising:
Boom and luffing jib are assembled in layout, end to end, position. Boom and luffing jib must be inline over front of blocked
crawlers prior to raising boom and luffing jib. Attach fixed jib backstay pendants to luffing jib insert and place on ground.
Slowly raise boom until 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). Boom is then raised while luffing jib point wheels are allowed to roll
on ground. Tension should be applied to luffing jib hoist to keep luffing jib strut off luffing jib during boom raising. Boom
up until boom to luffing jib angle reaches value specified in Table 3 and Table 4. Tighten luffing jib suspension with luffing
jib hoist. Attach fully assembled fixed jib to luffing jib. Attach fixed jib backstays to fixed jib strut. Attach fixed jib stop to
fixed jib butt and temporarily tie off to fixed jib strut. Boom and luffing jib are raised together using boom hoist while fixed
jib point wheel rolls on ground. Continue raising until fixed jib suspension tightens. Attach fixed jib stop to luffing jib top.
Boom, luffing jib and fixed jib are then raised together using boom hoist until boom reaches desired boom operating angle.
Fixed jib radius must be within capacity chart before swinging over side of machine.
Lowering:
Position boom at 75 degrees with boom and luffing jib and fixed jib inline over front of blocked crawlers prior to lowering
luffing jib. Lower luffing jib until boom to luffing jib angle reaches value specified in Table 3 and Table 4. Lower boom
until fixed jib point wheel contacts ground. Remove fixed jib stop from luffing jib top and temporarily tie off to fixed jib strut.
Lower boom as fixed jib point wheel rolls on ground. Lower boom until luffing jib point wheels contact ground. Remove
fixed jib from luffing jib. Lower boom while luffing jib rolls 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 and unpin luffing jib stop pendants. Rotate luffing jib stop struts forward and lower boom
and luffing jib to ground.
REFERENCE
ONLY!
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