Gerotor
9
Installing the Shaft Assembly into the Motor Body
1. Place the Shaft Assembly into the Motor Body
Bearing Bore (See Figure 23).
The Shaft Assembly and Motor Body Bearing Bore
must be aligned prior to pressing the Shaft
Assembly into the Motor Body Bearing Bore.
Misalignment will result in pinched Spacer Rings.
2. An unthreaded section of pipe (1" Dia X 4" long) is
needed to support the Outer Bearing Race of the
Shaft Ball Bearing. Place this pipe over the Shaft
Assembly; then, using an arbor press, press the
Shaft Assembly down until the Retaining Ring can be
installed in its groove in the bearing bore of the
Motor Body (See Figure 24).
Figure 23
Reassembly of the Remaining Hydraulic Motor Parts
1. Place the Motor Body in a vise with the large end of
the Shaft facing up.
2. Coat the new o-ring with a thin film of oil; then, install
the o-ring in the Motor Body (See Figure 25).
3. Install the Roll Pin on the Shaft. Place the Inner
Gear of the Gerotor onto the Shaft, making sure the
Gerotor Slot lines up with the Roll Pin in the Shaft
(See Figure 25).
The Roll Pin Key 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 in
the Motor Body (See Figure 25).
5. Lightly lubricate the area between the inner and
outer Gerotor and Gerotor Housing with hydraulic or
mineral oil.
6. Install the Gerotor Housing, making sure the Pins in
the Gerotor Housing line up with their respective
holes in the Motor Body.
7. Coat the new O-ring with a thin film of oil; then,
install the O-ring on the Motor End Plate.
8. Place the End Plate on the Gerotor Housing, making
sure the holes in the End Plate line up with the Pins
in the Gerotor Housing.
9. Install the four Socket head Cap Screws in the Motor
End Plate; then, using a 1/4" allen wrench,
alternately and evenly tighten them to 15 ft. lbs. [20.3
Nm] torque (See Figure 26).
Figure 24
Figure 25
Figure 26
O-ring
Motor End
Plate
Gerotor
Housing
O-ring
Motor
Housing
Tank Port
Adapter
Pressure Port
Adapter
Bypass Adjusting
Screw Nut
Bypass Adjusting
Screw
Socket Head
Cap Screws
10. Put the Thread Seal Gasket on from the slotted end of
the Bypass Adjusting Screw leaving four threads
showing beyond the Thread Seal Gasket (See Figure
26).
11. Install the Washer and Nut onto the Bypass
Adjusting Screw; then, install the Bypass Adjusting
Screw into the Motor Plate (See Figure 26).
a. For Closed Center Hydraulic Systems, turn the
bypass adjusting screw in until it bottoms out in
the end plate; then, using a 9/16" box wrench,
tighten the nut.
Roll
Pin
