Hydraulic Motor Disassembly - Alamo Industrial Hydro 88 Operator's Manual

HYDRAULIC MOTOR DISASSEMBLY

1. Clean outside of unit thoroughly. Refer to Hydraulic Motor illustration in the Parts Listing section.
2. Clamp Shaft in a protected jaw vise with backplate end up.
3. Remove six cap screws from backplate.
4. Use a plastic mallet and tap the backplate to loosen it- then remove it.
5. Remove o-ring from backplate.
6. Remove the complete piston block assembly from the housing assembly.
7. Remove the piston assemblies, spider, and pivot form piston block assembly.
8. The piston block assembly need not be disassembled unless the pins or spring is damage.
The following procedure is to be used if the spring is to be removed from the piston block. The
CAUTION
spring is highly compressed and the snap ring should not be removed without compressing the
spring."
The following parts will be needed to disassemble the piston block:
2 ea. 3/8 I.D. x 1-1/8 O.D. flat washer
1 ea. 3/8 I.D. x 3-1/4 N.C. capscrew
1 ea. 3/8 N.C. nut
Place one of the flat washers over the 3/8 x 3-1/4 capscrew and place this through the center of the piston block.
Place the other washer over the capscrew and let it rest on te three pins. Screw the nut on and compress the
spring inside the piston block. Use a pair of snap ring pliers and remove the internal snap ring. Remove the bolt
and two washers. Remove the two washers, spring, three pins, and pin keeper.
9. Reove thrust face from housing.
10. Remove snap ring from housing.
11. Remove shaft seal from housing.
12. Remove washer from housing.
13. Remove drive shaft from housing.
14 . Remove the two snap rings, thrust washers, and thrust bearing, from drive shaf
INSPECTON
1. Wash all parts thoroughly in a suitable solvent.
2. Examine needle bearings in housing and backplate.
3. Inspect thrust washers and thrust bearing. All surfaces should be free of any signs of wearing or fretting.
4. Inspect spider and pivot; conical surfaces should be free of wear and scorn marks.
HYDRO 88 & 96 03/94
© 2003 Alamo Group Inc.
MAINTENANCE
Maintenance Section 5-9