8596-A, 2011-10-07/GA
Page 1 of 3
18000 With
21000 MAX-ER
Luffing Jib Raising Procedure
Luffing Jib No. 79A on Boom No. 55 or No. 55A
with 140 Ft. (42.7m) Mast No. 56
Wheeled Counterweight
Manitowoc Cranes, Inc.
Manitowoc, Wisconsin 54220 U.S.A.
Recommended boom and luffing jib raising and lowering procedure.
Machine must be equipped with 492,000 Lb. (223 170 kg) crane counterweight, 320,000 Lb.
(145 150 kg) carbody counterweight and 0 Lb. (0 kg), 464,000 Lb. (210 470 kg) or 860,000 Lb.
(390 090 kg)wheeledcounterweight.Refer toluffingjibriggingassemblyNo. A08238forboom
and luffing jib make-up of inserts, straps, struts, strut raising procedure, jib stop positioner setup
and operation, jib stop raising and lowering procedure and miscellaneous parts, etc.
Boom and luffing jib combinations must be raised and lowered using jack-knife method.
Release swing brake (disengage swing lock) and slowly raise boom while jib point dolly is
allowed to roll on ground. Tension should be applied to luffing jib hoist to keep jib strut off
luffing jib during boom raising. Boom up until boom to luffing jib angle reaches 140 degrees.
Extend jib stop positioner cylinders (see procedure). Continue to boom up until boom to
luffing jib reaches value specified in table. 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 end of blocked crawlers.
Position boom at 85 degrees prior to lowering luffing jib. Lower luffing jib until boom to
luffing jib angle reaches value specified in table. Lower boom until luffing jib point is just
above ground. Position dolly under upper jib point, then lower upper jib point onto dolly.
Release swing brake (disengage swing lock) and continue to lower boom while luffing jib
rolls along ground until boom to luffing jib angle reaches 140 degrees. Keep enough tension
on luffing jib hoist to keep jib strut off luffing jib. Retract jib stop positioner cylinders (see
procedure). Continue to lower boom while luffing jib rolls along ground.
CAUTION: Do not under any condition allow boom to luffing jib angle to become less than
70 degrees.
WITH OR WITHOUT BOOM AND/OR JIB CATWALKS
Maximum Boom and Luffing Jib Lengths Lifted Unassisted Using Jack-Knife Method
Boom
Length
Over End of Blocked Crawlers Over Side of Crawlers
0 Lb. (0 kg) Wheeled Counterweight
Luffing Jib No. 79A
Boom to
Luffing Jib
Angle Luffing Jib No. 79A
Boom to
Luffing Jib
Angle
Feet Meters Feet Meters Degrees Feet Meters Degrees
160 48.8 90 - 130 27.4 - 39.6 140 90 27.4 140
150 - 270 45.7 - 82.3 90 110 - 210 33.5 - 64.0 90
290 - 310 88.4 - 94.5 70 230 - 310 70.1 - 94.5 70
180 54.9 90 - 210 27.4 - 64.0 90 90 - 110 27.4 - 33.5 90
230 - 310 70.1 - 94.5 70 130 - 270 39.6 - 82.3 70
200 61.0 90 - 190 27.4 - 57.9 70 — ——
Load blocks, hook and weight ball on ground until boom and luffing jib are erected.
