OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-30 Published 10-01-12, Control # 044-05 v2
Luffing Hoist Operation
1. Select and confirm LUFFING JIB mode.
2. If equipped, disable free fall for rear drum (see Disabling
and Enabling Free Fall in this section).
3. Disengage rear drum pawl.
Luffing jib will not lower until pawl is disengaged. It may
be necessary to raise luffing jib slightly before pawl will
disengage.
4. Increase engine speed to desired rpm with hand throttle.
Press foot throttle to momentarily increase engine speed
when more power is required.
5. Move rear drum handle to FRONT from off to LOWER
luffing jib or to REAR from off to RAISE luffing jib.
6. As luffing jib nears desired angle, slowly move rear drum
handle toward off to decrease speed. Then move handle
to off to stop luffing jib and hold it in position (brake will
apply).
7. Engage rear drum pawl and turn on rear drum park once
luffing jib is at desired angle.
WARNING
Avoid Death or Serious Injury!
Read and understand instructions in Luffing Jib
Operator’s Manual before attempting to raise or lower
luffing jib from or to ground.
Use extreme care when operating luffing hoist and boom
hoist at same time. Maximum or minimum operating
radius will be reached quickly when operating both hoists
at same time.
CAUTION
Rigging Damage!
Avoid damage to luffing jib rigging. Check that luffing hoist
wire rope is reeved through all sheaves and spooled
properly onto rear drum before raising boom and jib from
ground.
See Luffing Jib Rigging Drawing in Luffing Jib Operator’s
Manual for wire rope and reeving specifications. See Wire
Rope Installation in Section 4 of this manual for
instructions on attaching wire rope to rear drum.
WARNING
Falling Jib Hazard!
When equipped with a luffing jib, do not operate rear drum
in FREE FALL mode. Luffing jib can lower uncontrolled if
this precaution is not taken. To prevent free fall from being
selected, disable free fall as instructed in Disabling Free
Fall in this section.
CAUTION
Machinery Damage!
Do not engage rear drum pawl while lowering luffing jib.
Damage to pawl or drum will occur.
Stop luffing hoist by moving rear drum handle to off and
then engage rear drum pawl.
WARNING
Two-Blocking Hazard!
Pay out load lines while lowering luffing jib. Load may
contact luffing jib point sheaves if this step is not taken.
Wire rope or other parts could break allowing load to fall.
WARNING
Falling Boom Hazard!
Operation with boom and/or luffing jib above up limits is
not intended or approved. Boom and luffing jib could be
pulled over backwards.
CAUTION
Luffing Jib Damage!
Avoid damage to luffing jib when lowering boom and jib to
ground. Disconnect jib stop pins before boom to luffing jib
angle is 168° or jib stop pendants get tight, whichever
occurs first.
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