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MAINTENANCE
INTERSTATER 02/11 Maintenance Section 5-19
© 2011 Alamo Group Inc.
MAINTENANCE
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.
5. Remove o-ring from backplate.
6. Remove the complete piston block assembly from the housing assembly.
7. Remove piston assemblies, spider, and pivot form piston block assembly.
8. The piston block assembly need not be disassembled unless the pins or spring is damaged.
The following procedure should be used if the spring is to be removed from the piston block.
The 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 the three pins. Screw 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. Remove thrust race 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 shaft.