HOISTS 14000 SERVICE MANUAL
5-4
Published 09-10-14, Control # 065-24
DRUM 3 PAWL ADJUSTMENT
General
Drum 3 (luffing hoist or auxiliary drum in boom butt) has a
drum pawl which, when engaged, prevents the drum from
turning in the down direction.
The pawl is controlled by Drum 3 park switch in the
operator’s cab:
• When Drum 3 Park is turned ON, the pawl engages.
Hydraulic cylinder (1, View A) extends and spring (2)
rotates pawl (3) into engagement with ratchet (4).
• When Drum 3 Park is turned OFF, the pawl disengages.
Hydraulic cylinder (1, View B) retracts and spring (2)
rotates pawl (3) out of engagement with ratchet (4).
NOTE: It may be necessary to hoist slightly to fully
disengage pawl (3) from ratchet (4).
Maintenance
The only maintenance required is to visually check the pawl
for proper operation. This should be done daily when the
hoist is in use.
Adjustment
See Figure 5-3, View B for the following procedure.
Adjustment is required only if the cylinder or other parts are
removed for repair or replacement.
NOTE: To remove cylinder (1), disengage pawl, loosen
adjusting screw (6) lock nut, and back out adjusting
screw to relieve spring (2) force.
1. Back out adjusting screw (6) fully.
2. Disengage pawl.
3. Loosen bracket (5) screws and position bracket so
screws are centered in bracket slots.
4. Securely tighten bracket screws.
5. Turn adjusting screw in (against pawl) until clearance
specified in View B is obtained.
6. Check pawl for proper operation. Make sure there is
enough spring force to hold pawl disengaged at
specified clearance.
7. If necessary repeat adjustment steps. Moving bracket in
direction of arrow will increase spring force.
FIGURE 5-3
3
Item Description Item Description
1 Hydraulic Cylinder 4 Ratchet
2 Spring 5 Adjusting Screw with Lock Nut
3 Pawl 6 Bracket with Cap Screws, Nuts, and Washers
4
View A
ENGAGED
View B
DISENGAGED
1
View from Right Side of Boom Butt
5
3
4
1
6
2
2
1/2 in (12 mm)
Clearance with Pawl
Disengaged
INCREASE
Spring Force
A17781
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