Pentair HYPRO HM1C Product Bulletin page 11

apart the boss area between the Gerotor Housing and
the Motor Body. (It may be necessary to alternate sides
when prying apart Motor sections.)
Figure 11
7. Remove both parts of the Gerotor.
8. On HM3C models, remove the Woodruff Key from the
Shaft. On HM1C, HM2C and HM4C models, remove
the Roll Pin from the Shaft.
9. Remove the o-ring from the Motor End Plate and Body
with a flat instrument such as a knife blade.
10. Inspect Motor End Plate, Body and Gerotor Housing for
wear and/or gouging. If gouging has occurred in both
the Motor End Plate and Body, the motor is not
repairable. If gouging has occurred in the Motor End
Plate, Body or Gerotor Housing, the part that is worn
must be replaced. If Gerotor Housing is damaged,
Gerotor parts must also be replaced.
To Remove the Shaft Assembly from the Motor Body
1. Remove the Slinger Ring from the Motor Shaft.
Special attention should be exercised when working
with retaining rings. Always wear safety goggles when
working with spring or tension loaded fasteners or
devices.
2. Using the large retaining ring pliers, remove the Retaining
Ring next to the Ball Bearing in the Motor Body.
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 12
3. 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 12).
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 13).
4. Inspect the sealing area of the shaft for wear. Inspect
other Shaft Assembly Components for wear and replace
if necessary.
Figure 13
5. While motor is completely disassembled, clean all parts
in a solvent bath.
Build Shaft Sub-Assembly
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.
Seal Spacer
Seal
Cartridge
Fig. 1
Important: To prevent damage to the seal lip extending out,
use seal spacer as shown to guard lip during assembly.
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.
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Press