PAGE 14
SERVICE INSTRUCTIONS CONTINUED
Pocket seals, body seals, and ring seals in the hydraulic motor assembly are not part of the winch seal kit. The
seal kit for the hydraulic motor can be ordered from the factory under Part No. 23131. All parts of the hydraulic
motor, with the exception of the motor adaptor, item 800, are standard parts of the
COMMERCIAL WM31
hydraulic
motor, having a 2 inch gear section. All of these parts can be ordered from PULLMASTER or COMMERCIAL
INTERTECH dealers in Canada, the United States and in most overseas areas.
REMOVAL OF HYDRAULIC MOTOR ASSEMBLY
If disassembly of the hydraulic motor is not necessary, proceed as follows:
1) Remove the 12 hex head capscrews, item 821, with lockwashers, item 823, from the motor adaptor, item 800.
Since brake springs, item 752, apply pressure against inside of the motor adaptor, it is recommended that hex
capscrews are unscrewed, one turn at a time, until the spring pressure has been released. Complete motor
assembly, including motor adaptor, can now be removed from brake housing assembly.
2) Remove and discard O-ring, item 801, and O-ring, item 707. (O-ring, item 801, seals pressure transfer hole for
automatic brake release and is situated on flange of brake housing.)ffffff
DISASSEMBLY OF BRAKE HOUSING ASSEMBLY
1) Aftermotor assembly has been removed, all parts of brake assembly are accessible. Remove 10 brake springs,
item 752. Thoroughly examine springs for damage and measure overall length. Overall spring length should
be 1.99 inches. If any spring measures less than 1.93 inches, replace all springs as a set.
2) Pull motor drive shaft, item 730, and complete brake hub assembly from brake housing.
3) Disassemble brake hub assembly by removing circlip, item 727, from motor drive shaft. Remove motor drive
shaft from brake hub, item 720. Remove sprag clutch aligners, items 722 and 724, support washers, item 717,
sprag clutch, item 723, and sprag clutch spacer, item 726, from brake hub.
4) Thoroughly inspect motor drive shaft, item 730, and brake hub, item 720, particularly surfaces where sprag
clutch, item 723, engages. If any indentation or surface damage is detected, replace brake hub, sprag clutch
and motor drive shaft as a set.
5) Pull the brake piston, item 750, out of brake housing using two 7/16-14NC bolts screwed into two puller holes
in piston and discard O-rings, item 751 and item 753.
6) Thoroughly examine inner bores of the brake housing and outer diameters of the brake piston for scoring caused
by hydraulic fluid contamination. Minor surface damage may be repaired by polishing with a fine emery cloth.
271 REV.970407
MINOR SURFACE DEFECTS WHERE THE SPRAG CLUTCH ENGAGES
THE MOTOR DRIVE SHAFT AND BRAKE HUB, WILL RESULT IN
BRAKE FAILURE AND ALLOW THE LOAD TO DROP, CAUSING
PROPERTY DAMAGE, SEVERE INJURY OR DEATH. THOROUGHLY
INSPECT THESE AREAS AND REPLACE MOTOR DRIVESHAFT,
SPRAG CLUTCH AND BRAKE HUB AS A SET.
DANGER
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