Manitowoc Published 05-26-17, Control # 238-02 5-29
MLC165-1 SERVICE/MAINTENANCE MANUAL HOISTS
DRUM 1 PAWL
See Figure 5-21
Drum 1 (front load drum) has a pawl which, when engaged,
prevents the drum from turning in the down direction.
Drum 2 does not have a pawl.
Operation
The pawl is controlled by a park switch in the operator cab:
When Drum 1 Park is turned on, the pawl engages (View A).
The hydraulic cylinder (7) extends and the spring (5) force
rotates the pawl (2) into engagement with the drum ratchet
(1).
When Drum 1 Park is turned off, the pawl disengages (View
B). The hydraulic cylinder (7) retracts and the cam (3) rotates
the pawl (2) out of engagement with the drum ratchet (1).
It may be necessary to hoist slightly to fully disengage the
pawl from the drum ratchet.
Maintenance
Daily
Visually check the pawl for proper operation according to the
following procedure.
1. Operate Drum 1 for a short distance, stop the drum, and
place the Drum 1 Park switch in the on position.
• Check that the pawl is fully engaged into the ratchet
of the drum. Adjust spring tension if necessary.
• Check that the drum is inoperable in the down
direction.
2. Place the Drum 1 Park switch in the off position.
• Check that the pawl is disengaged from the ratchet
at the dimension shown in View B.
• Check that the drum is operable in the down
direction.
Weekly
Apply a small amount of grease (open gear lube) to the
sliding surfaces (4). Wipe off any excess grease.
WARNING
Falling Boom Hazard
Before performing the steps in this section, land the loads
and lower the boom onto blocking at ground level. There
is no positive means of holding the boom up when the
pawl is being serviced.
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