Manitowoc 18000, Service Maintenance Manual, Page: 215 / 316

Reference
Only
Manitowoc
Published 12-05-17, Control # 035-23
5-1
18000 SERIVCE/MAINTENANCE MANUAL HOISTS
5
SECTION 5
HOISTS
HOIST DRAWINGS
Applicable hoist and load block drawings are attached at the
end of this section.
BOOM HOIST PAWL ADJUSTMENT
General
The boom hoist (Drum 4) has a drum pawl which is a positive
locking device. When engaged, the pawl prevents the boom
hoist drum from turning in the down direction.
The pawl is engaged and disengaged electrically by a motor
driven screw-type actuator controlled by the boom hoist park
switch in the operator’s cab. A limit switch inside both ends of
the actuator turns off the motor when the actuator is fully
extended or retracted.
The pawl was adjusted at the factory and should not need
adjustment during the service life of the actuator. Adjustment
is required when a new actuator is installed.
ACTUATOR REMOVAL
See Figure 5-1 for the following procedure.
1. Turn off Drum 4 park to disengage pawl (1) and stop
engine . Actuator (3) will retract.
NOTE: It may be necessary to hoist slightly before the
pawl will fully disengage.
2. Disconnect electrical cord (4) from actuator (3).
3. Loosen jam nut (5) and back out adjusting screw (6) until
leaf spring (7) is fully relaxed.
4. Carefully remove pins (8) securing actuator (3) to lug (9)
and bracket (10).
5. If necessary, loosen bracket nuts (11) to loosen actuator
pins (8).
6. Remove actuator (3).
Actuator Installation and Adjustment
See Figure 5-1 for the following procedure.
1. Turn ignition key to RUN position. Do not start engine .
2. If necessary, turn on Drum 4 park switch.
3. Connect electrical cord (4) to actuator (3). Actuator will
retract.
4. Pin actuator (3) to bracket (10) and lug (9).
5. Set Dimension A (View B):
a. Loosen bracket nuts (11).
b. Adjust position of bracket (10) until Dimension A is
obtained between pawl (1) and ratchet tooth (2).
c. Securely tighten nuts (11) to hold bracket (10) in
position.
WARNING
Falling Boom Hazard!
Land loads and lower boom onto blocking at ground level
before performing steps in this section. There is no
positive means of holding boom up when pawl is being
serviced.
DANGER
Flying Part Hazard!
Leaf springs are preloaded. Do not proceed to step 4 until
step 3 is performed. Parts will fly apart with sudden and
dangerous force if spring preload is not relieved.
DANGER
Pinch Point Hazard!
Actuator rod will retract when step 3 is performed. To
prevent crushing injury to hands, keep actuator clear of all
other parts while performing step
3 .