24
MAINTENANCE SECTION
Assembly of Throttle
1. Insert the Valve Seat Face (14) into the internal
groove and the Valve Seat Seal (15) to the external
groove of the Throttle Valve Seat Assembly (13).
2. Insert and firmly seat the assembled Valve Seat, small
diameter first, into the tapped end of the Motor
Housing (1).
3. With the Housing held firmly in leather–covered or
copper–covered vise jaws, inlet bushing end up, place
the Throttle Valve Ball (16), the Throttle Valve
Spring (17), smaller diameter first, and the Air
Strainer (27) into the inlet bushing end.
Make certain that the Air Strainer sits within the
Inlet Bushing (28).
4. Thread the Inlet Bushing into the Motor Housing and
tighten it to 35 to 45 ft–lb (47 to 61 Nm) torque.
5. Place the Throttle Plunger Bushing Seal (11) on the
Throttle Plunger Bushing Assembly (10) and thread
the Bushing Assembly into the Motor Housing.
6. Place the Throttle Plunger Seal (9) on the Throttle
Valve Plunger Assembly (8) and insert the Plunger,
beveled end first, through the Throttle Plunger
Bushing Assembly.
7. Install the Throttle Lever (29) using the Throttle
Lever Retaining Pin (30) and operate the lever to
check for free movement.
Assembly of Motor
1. Slide the Rear End Plate (45), recessed face trailing,
followed by the Rear Rotor Bearing (42), shielded
side trailing, onto the threaded hub of the Rotor (38).
Thread the Rotor Bearing Retaining Nut (43) onto the
hub a few turns.
2. Support the Rear End Plate, see Dwg. TPD614, and
place one 0.001” (0.03 mm) thick shim between the
End Plate and a solid rotor boss.
0.0005” TO 0.0001”
(0.030 MM TO 0.013 MM)
10 LB. (4.54 KG) FORCE
(Dwg. TPD614)
3. While applying a 10 lb (4.54 kg) force downward as
illustrated, tighten the Retaining Nut until the spacing
of the Rotor and End Plate is approximately 0.001”.
Remove the shim and manually rotate the preloaded
Rotor to detect rubbing between the Rotor and End
Plate. If rubbing is detected, back the Nut off a turn
and repeat this procedure.
4. Stand the assembled Rotor on a workbench with the
splined end up. Slide the Cylinder (46) over the
Rotor so the 1/8” (3 mm) diameter hole in the
Cylinder is aligned with the slot in the Rear End Plate
and so the recess port in the end of the Cylinder is to
the left of the 1/8” hole when viewed from the splined
end.
5. Wipe each Vane (39) with a light coat of
Ingersoll–Rand No. 10 Oil. Insert a Vane into each
slot in the Rotor. Slide the Front End Plate (47),
recessed face trailing, onto the splined Rotor hub.
6. Press the Front Rotor Bearing (48) onto the splined
hub and rotate the Rotor manually to make certain it
moves freely without binding.
The dowel hole in the bore of the Housing is in line
with the Throttle Lever.
7. Using an 1/8” (3 mm) diameter rod as a guide going
through the notch in the Front End Plate, through the
hole in the Cylinder, the notch in the Rear End Plate,
and the holes in the Rear End Plate Gasket and the
Rear Rotor Bearing Support, guide the motor into the
bore of the Motor Housing Assembly (1).
8. Carefully remove the guide rod and replace it with the
Cylinder Dowel (49).
9. Install the Front Rotor Bearing Retainer (51) in its
groove inside the Front Rotor Bearing Support (50).
Assembly of the Gear Case Assembly
For L and M Ratio Gearing
An L or M is stamped on the web of Spindles for L
or M ratio gearing.
1. Press a Planet Gear Bearing (86) into each Spindle
Planet Gear (85) to a depth of 0.000” to 0.010”
(0.00 mm to 0.25 mm) from the face of the Gear
using the proper bearing inserting tool, see Dwg.
TPD637–1 and Table A, shown on page 25, and
lubricate the Bearings as instructed in
LUBRICATION.
