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If bearing is binding against the retaining ring so that
it cannot easily be removed, place the motor body
(threaded portion of the shaft up) on arbor press.
Using a piece of un-threaded metal pipe (1" dia. x 4"
high [254. mm x 101.6 mm high]), slide over the shaft
and gently press down with the arbor press just
enough to relieve the pressure on the retaining ring.
Figure 13
2. Place body in position on arbor press. Threaded
portion of the Shaft should be inside the fixture.
Press out shaft assembly with arbor press
(See Figure 13).
Hydraulic Motor Shaft Disassembly and Repair
1. Remove Large Retaining Ring from Shaft with a
screwdriver. Remove Thrust Bearing Assembly
from Shaft (includes the Thrust Bearing and two
Thrust Bearing Races) and the Seal Spacer.
2. Remove the Small Retaining Ring next to the Shaft
Ball Bearing.
3. To remove the Bearing from the shaft, place the shaft
(threaded end up) in the arbor press fixture. Place the
two support bars provided in the repair kit opposite
each other and between the seal on the shaft and the
arbor press fixture. Using an arbor press, press the
shaft through the Bearing, Seal Spacer and Seal
(See Figure 14).
4. Inspect the sealing area of the shaft for wear.
Inspect other Shaft Assembly Components for wear
and replace if necessary.
Figure 14
5. While motor is completely disassembled, clean all
parts in a solvent bath.
Assembly Instruction for New Seal-Type Motors
New Seal Type
Case-drain casting boss is present (with or without case drain port) only on
motors manufactured with "new" type hydraulic seal.
Case-drain boss with or
without machined feature
1. To assemble the seal cartridge, remove the old seal from the
cartridge by pressing it out. The cartridge is reused by assembling
the new seal into cartridge, ensuring the new seal is pressed in with the lip
seal on the opposite side as shown in Fig.1.
Note: To prevent damage to the seal lip extending out, use seal
spacer as shown to guard lip during assembly.
Press
Seal Spacer
Seal
Cartridge
Fig. 1
2. Install the large retaining ring onto large diameter end of shaft.
3. From the small, threaded end of the shaft, install the following parts in
this order: thrust bearing race, thrust bearing, 2nd thrust bearing race.
Note: The thrust bearing and races should not be reused if they are showing
any signs of wear.
4. Install new type seal spacer (looks like a thick washer, approx .130 inch
thick.)
5. Before installing the new seal, its lip must be expanded to fit on the shaft.
With the seal lip facing out, slide the seal over the threaded end of the
shaft and gently push the seal onto the raised area of the shaft. Do not
push the seal past the large retaining ring groove on the shaft.
6. Once the seal has been expanded, remove the seal from the shaft.
7. Install seal cartridge assembly: With seal lip facing the large end of the
shaft, slide the seal cartridge assembly over the threaded end of the shaft
and gently push into the raised area of the shaft. Align the seal lip to enter
the center diameter of the seal spacer and push until seal body touches
seal spacer.
Note: If the seal lip is longer than the seal spacer's width, please stop the
assembly and review parts being used.
8. Assemble two o-rings on the outside body of the new seal cartridge
assembly as shown in Fig 2. Install o-rings one at a time and do not roll
over each other.
Fig. 2
9. Finished shaft sub-assembly should look like this:
10. Do not press, but place the shaft sub-assembly into the motor body
with threaded end of shaft up. Lubricate the two o-rings with hydraulic or
mineral oil before assembling.
7
(2) O-rings
Shaft
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