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seal kit for the hydraulic motor can be ordered from the factory under Part No. 23121. All parts of the hydraulic
motor, with the exception of the motor adaptor, item 800, are standard parts of the
WM51
hydraulic motor, having
a 2 inch gear section. All of these parts can be ordered from PULLMASTER or Authorized Distributors/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 12 hex head capscrews, item 821, with lockwashers, item 823, from motor adaptor, item 800. Since
brake springs, item 752, apply pressure against the inside of the motor adaptor, it is recommended that the hex
capscrews are unscrewed, one turn at a time, until the spring pressure has been released. The complete motor
assembly, including the motor adaptor, can now be removed from the brake housing assembly.
2) Remove and discard O-ring, item 801, and O-ring, item 707. (O-ring, item 801, seals the pressure transfer hole
for the automatic brake release and is situated on the flange of the brake housing.)
DISASSEMBLY OF BRAKE HOUSING ASSEMBLY
1) After the motor assembly has been removed, all parts of the brake assembly are accessible. Remove 16 brake
springs, item 752. Thoroughly examine springs for damage and measure overall length. Overall spring length
should be 1.99 inch. If any spring measures less than 1.93 inch, 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,
and two sprag clutches, item 723, from brake hub.
245 REV.990710
SERVICE INSTRUCTIONS CONTINUED
DAMAGED FRICTION OR DIVIDER PLATES WILL REDUCE BRAKING
CAPACITY AND ALLOW THE LOAD TO DROP, CAUSING PROPERTY
DAMAGE, SEVERE INJURY OR DEATH. SOLVENT MAY DAMAGE THE
FRICTION PLATES. DO NOT USE SOLVENT TO CLEAN THE FRICTION
PLATES. PERFORM THOROUGH INSPECTION AND, IF NECESSARY,
REPLACE FRICTION AND DIVIDER PLATES AS A SET.
DANGER
4) Thoroughly inspect motor drive shaft, item 730, and brake hub, item 720, particularly the surfaces where two
sprag clutches, item 723, engage. If any indentation or surface damage is detected, replace brake hub, sprag
clutch and motor drive shaft as a set.
5) Pull brake piston, item 750, out of brake housing using two 1/2-13NC bolts screwed into two puller holes in piston
and discard O-rings, item 751 and item 753.
6) Thoroughly examine the inner bores of the brake housing and the 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.
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, IF NECESSARY, REPLACE MOTOR
DRIVE SHAFT, SPRAG CLUTCH AND BRAKE HUB AS A SET.
DANGER
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