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with the exception of the motor adaptor item 800, are standard parts of the 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 inside of motor adaptor, it is recommended that hex
capscrews are unscrewed, one turn at a time, until spring pressure has been released. The 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.)
DISASSEMBLY OF BRAKE HOUSING ASSEMBLY:
1) After motor assembly has been removed, all parts of 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.
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.
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.
256 REV.030718
DANGER
DANGER
4) Thoroughly inspect motor drive shaft item 730, and brake hub item 720, particularly 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 inner bores of brake housing and outer diameters of brake piston for scoring caused
by hydraulic fluid contamination. Minor surface damage may be repaired by polishing with a fine emery cloth.
SERVICE INSTRUCTIONS
CONTINUED
