PAGE 14
SERVICE INSTRUCTIONS CONTINUED
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 the 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.)
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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 inches. If any spring measures less than 1.93 inches, replace all springs as a set.
2) Pull the motor drive shaft, item 730, and complete brake hub assembly from the 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 the surfaces where the
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 the brake housing using two 1/2-13NC bolts screwed into the two puller
holes in the 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.
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.
247 REV.980215
DANGER
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 DRIVESHAFT, SPRAG CLUTCH AND BRAKE HUB AS A SET.
DANGER
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