25
MAINTENANCE SECTION
5. Grasp the Rotor in copper–covered or leather–covered
vise jaws with the Bevel Pinion or Spindle Bearing
Nut upward. Using a 1/2” wrench for the Nut or a
9/16” wrench for the Pinion, unscrew and remove the
Pinion or Nut.
6. If the Front Rotor Bearing (17) must be replaced,
support the Front End Plate (14) between two blocks
on the table of an arbor press. Place the blocks as
close to the body of the Rotor as possible and press
the Rotor from the Bearing and End Plate. Remove
the Front End Plate Spacer (15) and Front Seal Cup
Assembly (16) from the hub of the Rotor.
7. If the Rear Rotor Bearing (9) must be replaced, use
snap ring pliers to remove the Rear Rotor Bearing
Retainer (11).
8. Using a bearing puller, pull the Rear Rotor Bearing
off the hub of the Rotor.
Disassembly of the Inlet and Throttle
1. Using a 15/16” wrench or six point socket, unscrew
and remove the Inlet Assembly (1).
2. Remove the Inlet Seal (3) and Inlet Screen (2) from
the Inlet.
3. Remove the Throttle Valve Spring Seat (4), Throttle
Valve Spring (4A) and Throttle Valve (4B) from the
Motor Housing (5).
4. If the Throttle Valve Seat (4C) must be replaced,
insert a hooked tool through the central opening of the
Seat and, catching the underside of the Seat, pull it
from the Housing.
5. If the Cartridge Case (4D) must be replaced, insert
two hooked tools through the central opening of the
Case approximately 180 degrees apart and, catching
the underside of the Case, pull it from the Housing,
6. Press the Throttle Lever Pin (7) from the Housing and
remove the Throttle Lever (6). Remove the Throttle
Valve Plunger (8).
ASSEMBLY
General Instructions
1. Always press on the inner ring of a ball–type bearing
when installing the bearing on a shaft.
2. Always press on the outer ring of a ball–type bearing
when pressing the bearing into a bearing recess.
3. Whenever grasping a tool or part in a vise, always use
leather–covered or copper–covered vise jaws. Take
extra care not to damage threads or distort housings.
4. Except for bearings, always clean every part and wipe
every part with a thin film of oil before installation.
5. Check every bearing for roughness. If an open bearing
must be cleaned, wash it thoroughly in clean solvent
and dry with a clean cloth. Sealed or shielded
bearings should not be cleaned. Work grease into
every open bearing before installation.
6. Apply a film of O–ring lubricant to every O–ring
before installation.
7. Unless otherwise noted, always press on the stamped
end of a needle bearing when installing a needle
bearing into a recess.
Assembly of the Throttle and Inlet
1 .Insert the Throttle Valve Plunger (8) into the Motor
Housing (5).
2. Position the Throttle Lever (6) on the Motor Housing
and using an arbor press, press the Throttle Lever
Pin (7) into the Housing and Lever. The Lever will
retain the Plunger in the Housing.
3. If the Cartridge Case (4D) was removed, lubricate the
outside and the throttle stem end of the Case with the
O–ring lubricant. Using a wooden dowel, push the
Case, open end trailing, into the Motor
4. If the Throttle Valve Seat (4C) was removed, use a
5/8” wooden dowel with a flat end to push the Seat
into the Motor Housing.
5. Push the small end of the Throttle Valve Spring (4A)
onto the end of the Throttle Valve (4B) with the short
stem until the Spring snaps into position around the
hub and remains there. Install the dish end of the
Throttle Valve Spring Seat (4) onto the large end of
the Throttle Valve Spring.
6. Holding the Housing with the Lever downward, make
sure the Plunger is out of the way and insert the
assembled Throttle Valve, long stem end leading, into
the housing recess.
7. Push the Inlet Screen (2), closed end leading, into the
bushing of the Inlet Assembly (1). After moistening
the Inlet Seal (3) with o–ring lubricant and being
careful not to nick the Seal on the threads of the Inlet,
install the Seal on the Inlet.
8. Thread the Inlet Assembly into the Housing and
tighten it between 20 to 25 ft–lb (27.1 to 33.9 Nm)
torque.
Assembly of the Motor
1. If the Rear Rotor Bearing (9) was removed, stand the
Rotor (12) upright on the table of an arbor press with
the threaded end downward. Place the threaded rotor
hub into a hole drilled into a flat, smooth block so that
the Rotor rests against the large rotor body. Press the
Rear Rotor Bearing onto the hub of the Rotor.
2. Install the Rear Rotor Bearing Retainer (11) in the
groove on the hub of the Rotor.
3. Install the Front End Plate (14), counterbored end
trailing, onto the threaded hub of the Rotor. Using
finger pressure, press the Front Seal Cup
Assembly (16), felt end trailing, onto the end of
theFront End Plate Spacer (15) that is opposite the
large internal bevel. Continue pressing until the felt
end is flush with the end of the Spacer. Saturate the
felt with Ingersoll–Rand No. 50 Oil. Place the
assembled Spacer, Seal Assembly trailing, onto the
threaded hub of the Rotor. Make sure the Seal
Assembly enters the recess in the Front End Plate.
