-11-
Reassembly of Remaining Hydraulic Motor Parts
1. Place Motor Body in a vise with large end of shaft facing
up.
2. Install the o-ring in the body.
3. Install the Roll Pin on the shaft. Place the Inner Gear of
the Gerotor onto the shaft making sure Gerotor slot lines
up with the key in the shaft.
The Roll Pin can slide up behind the inner gear of the
gerotor when the gear is installed. Make sure the key is
visible in the slot after the gear is in place.
4. Install the outer portion of the Gerotor, making sure the
Gerotor is centered within the o-ring groove on the body.
5. Install the Gerotor Housing, making sure the pins in the
Gerotor Housing line up with their respective holes in the
body.
6. Lightly lubricate the area between the Inner and Outer
Gerotor, the Outer Gerotor, and Gerotor Housing with
hydraulic oil or mineral oil.
Special attention should be exercised when working with
retaining rings. Always wear safety goggles when work-
ing with spring or tension-loaded fasteners or devices.
7. Install o-ring on the motor end plate.
8. Place end plate on gerotor housing, making sure holes in
end plate line up with pins in the gerotor housing.
Figure 14
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.
Important: 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 B. Install o-rings one at
a time and do not roll over each other.
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.
(2) O-rings
Shaft
Fig. B
3. Turn the motor body assembly over (threaded shaft end
down) on the arbor press. Press the shaft down into
its “final position” until the small retaining ring can be
installed in the shaft next to the ball bearing.
4. Install small retaining ring on shaft.
5. Check shaft rotation at this point. It should rotate
smoothly with only slight resistance from the seal lip
pressure on the shaft. If you feel any gritty or stick-
ing movement, return assembly to the arbor press
and lightly press on the threaded end of the shaft to
relieve press fit compression on the thrust bear-
ing. Note: Don’t over do this press. The objective is
to move the small outer retaining ring installed in the
previous step back to ”touching only” the ball bearing
inner race.
Important:
If gritty or sticky movement persists, it’s likely
due to re-used parts or the body needle bearing is in
need of replacement.
Figure 15
Install Shaft Sub-Assembly Into Motor Body
Important: Make sure the surface edge of the arbor press
fixture is smooth and clean. An unthreaded piece of
pipe (1” x 4” high) is needed to support the outer race of
the seal cartridge sub-assembly and outer race of the
ball bearing during assembly. Place this pipe over the
shaft threaded end for assembly of the following steps.
1. Place the body on a support fixture in the arbor press.
Using an unthreaded piece of pipe (1” dia. x 4” high),
press the shaft subassembly down into the body until it
bottoms out. This is a light press fit and should be done
slow and easy.
2. Install the new ball bearing onto the threaded end of
the shaft. Press down using the 1” x 4” pipe until the
retaining ring can be installed in its groove in the bear-
ing core of the motor body. Install the retaining
ring.
L-1526 (12/12, Rev. B)
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