HOISTS 2250 SERVICE/MAINTENANCE MANUAL
5-16
Published 11-06-15, Control # 040-13
DRUM CLUTCH INSPECTION AND
ADJUSTMENT — STANDARD
Description
See Figure 5-13 for the following procedure.
The drum clutch is an internal, expanding band-type clutch
that is spring applied and air released.
On a single drum shaft, the clutch is mounted on the left end
of the drum. On a split drum shaft, a clutch is mounted on the
outboard end of both drums.
Each drum clutch is controlled by a 2-position (on/off)
normally-closed solenoid valve located on the left side of the
rotating bed.
A clutch access hole with a removable cover is provided in
the guard over each drum brake and clutch.
Make all inspections and adjustments when the clutch linings
are cold.
Inspection and Adjustment
See Figure 5-14 for the following procedure.
Make sure the air system pressure is 120 to 132 psi (8,3 to
9,1 bar) at all times during inspection and adjustment
procedure.
1. Lower load block or weight ball to ground so wire rope is
slack on drum being serviced.
2. Select STANDARD mode and confirm.
3. To position clutch parts in access hole during inspection
and adjustment steps, proceed as follows:
a. Remove cover from over access hole.
b. Stand clear of clutch while drum is turning.
c. Move drum handle for clutch being serviced in either
direction from off to turn clutch and drum.
d. Release drum handle to off to stop clutch and drum
when desired part is accessible through access
hole.
Adjuster, signal operator when to stop drum.
4. Position live end of clutch band in access hole and
inspect lining wear.
The clutch lining is 3/8 in (10 mm) thick when new. Replace
the lining before its thickness is less than 1/4 in (6 mm) or
drum will be scored by lining rivets.
FIGURE 5-13
Left Rear
Drum Clutch
Solenoid Valves on
Left Side of Rotating Bed
P805
Front Drum
Clutch
(if equipped)
Rear or Right
Rear Drum
Clutch
CAUTION
Moving Machinery Hazard!
It is necessary to rotate load drum and apply/release drum
clutch during inspection, adjustment, and overhaul steps.
Drum clutch inspection, adjustment, and overhaul require
two people: one to operate drum controls and one to
perform inspection, adjustment, and overhaul steps.
Maintain constant communication between adjuster and
operator so drum is not operated while adjuster is in
contact with parts.
Lower load block or weight ball onto ground so wire rope
is slack on drum being serviced.
• Adjuster, stay clear of all moving parts while load
drum and clutch are being operated.
• Operator, do not operate drum controls until adjuster
is clear of moving parts.
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