-9-
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) and place 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
Hydraulic Motor Shaft Disassembly and Repair
1.
Remove Large Retaining Ring from Shaft with a screw-
driver. Remove Thrust Bearing Assembly from Shaft (in-
cludes 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).
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).
Figure 13
4.
Over the large end of the Shaft, install the Seal Spacer,
Thrust Bearing Race, Thrust Bearing, second Thrust Bear-
ing Race and the Large Retaining Ring.
To Install Shaft Bearing
1.
Over the threaded end of the Shaft, install the Spacer Ring
and the Ball Bearing.
2.
Insert the Shaft (threaded end down) into the arbor press
fixture. Place the two support bars opposite each other and
between the Bearing and the fixture. Place on an arbor
press and carefully press the Shaft down allowing just
enough room for the Retaining Ring next to the Bearing to
be installed.
4.
Inspect the sealing area of the Shaft for wear. Inspect other
Shaft Assembly Components for wear and replace if
necessary.
5.
While Motor is completely disassembled, clean all parts in
a solvent bath.
To Install New Shaft Seal
1.
The sealing lips on a new Seal must be expanded to fit on
the Shaft. Press seal onto large end of Shaft with seal lip
facing out. Do not push Seal past keyway on Shaft.
2.
Once seal lip has been expanded, remove the Seal from
the Shaft.
3.
With the seal lip facing the large end of the Shaft, slide the
Seal over the threaded end of Shaft and gently push onto
the raised area of the Shaft, stopping approximately 1/4"
[6.35 mm] from the Large Retaining Ring groove.
