Maintenance
Lubrication of the Motor
1. Remove the Gear Case Cover Cap Screws (28).
2. Grasp the Drive Shaft (26) and, as a unit, withdraw the Drive Shaft
and Gear Case Cover.
3. Work some grease into both Drive Shaft Bearings (15) and the
Front Rotor Bearing (23). Coat the teeth on the Drive Gear (17) and
Rotor Pinion (22) with grease. Use grease sparingly. About one
teaspoon of grease should be sucient for these members.
4. Replace the Gear Case Cover and Drive Shaft, and install the
Gear Case Cover Cap Screws. Alternately tighten the Cap Screws
between 13 and 14 ft-lb. (17.6 and 19.0 Nm) torque.
Install the cap screw at bottom dead center rst. Refer to note on
Drawing TPB474-1.
For gas operated Motors, do not disassemble further unless you
have two new Cylinder Seals (9) on hand.
5. Unscrew the Housing Cover Cap Screws (2) and withdraw the
Motor Housing Cover (1). Try not to separate the joint between
the Housing and Gear Case and do not change the location of the
Housing relative to the Cylinder.
6. Work some grease into the Rear Rotor Bearings (5).
7. If you separate the Motor Housing from the Gear Case, or changed
the location of the Housing relative to the Cylinder, carefully
inspect the Cylinder Seals (9). If the Seals appear damaged in any
respect, install new Seals.
8. Replace the Motor Housing Cover and install the Housing Cover
Cap Screws. With the motor running at a slow speed (30 to 40
psig) (267 to 276 kPa) alternately tighten the Screws between 28
and 31 ft-lb. (37.9 and 42.0 Nm) torque.
9. Check the Motor for leaks by plugging the exhaust port and
admitting 50 psig (345 kPa) of compressed air in the inlet. Apply
soap suds or oil to the joint at each end of the Motor Housing and
check for bubbles.
10.If the Motor leaks, check the tightness of the Housing Cover Cap
Screws. If this does not correct the trouble, install new Cylinder
Seals (9).
Disassembly
General Instructions
1. Do not disassemble the motor any further than necessary to
replace or repair damaged parts.
2. Do not press any needle bearing from a part unless you have a
new needle bearing on hand for installation. Needle bearings are
always damaged during the removal process.
3. When grasping a tool in a vise, always use leather- covered or
copper-covered vise jaws to protect the surface of the part or
motor and help prevent distortion. This is particularly true of
threaded members and housings.
4. Do not remove any part which is a press t in or on a subassembly
unless the removal of that part is necessary for repairs or
replacement.
Disassembly of the Motor
1. Remove the Gear Case Cover Cap Screws (28).
2. Grasp the Drive Shaft (26) and, as a unit, withdraw the Drive Shaft
and Gear Case Cover (19).
3. Remove the Drive Shaft Key (27) and push the assembled Drive
Shaft out the motor end of the Gear Case cover.
4. Using snap ring pliers, remove the Drive Shaft Retainer (16) and
pull the Drive Shaft Bearing (15) and Drive Gear (17) o the Drive
Shaft.
5. Remove the Drive Gear Key (18) from the slot in the Drive Shaft
and pull the remaining Drive Shaft Bearing o the Drive Shaft.
6. Pull the Drive Shaft Grease Seal (20) out of the Gear Case Cover.
7. For gas operated Motors, if the Gear case Cover Seal (14) is nicked
or damaged, pull it out of the groove in the Gear Case (13).
For gas operated Motors, make certain you have two new
Cylinder Seals (9) on hand before proceeding with the
disassembly.
When removing the Motor Housing Cover (1) in the next step,
it is important to note the orientation of the End Plate (7) and
Cylinder (8) in relation to the cylinder dowel hole in the Motor
Housing Cover in order to maintain the desired motor rotation.
8. Unscrew the Housing Cover Cap Screws (2) and withdraw the
Motor Housing Cover (1).
9. Remove the Gear Case from the output end of the Motor Housing
(12).
10. Grasp the geared end of the Rotor (25) and pull the assembled
motor out of the Motor Housing.
11. Using a thin blade screwdriver, pry the Rotor Pinion Retainer (21)
out of the groove on the rotor shaft and pull the Rotor Pinion
(22), Front Rotor Bearing (23) and Front End Plate (7) o the hub
of the Rotor.
12. Remove the Gear Case Gasket (24) from the End Plate or Gear
Case.
13. Pull the Cylinder (8) and Cylinder Dowel (10) o the Rotor and
remove the Vanes (11) from the vane slots in the Rotor.
14. For gas operated Motors, remove the two Cylinder Seals (9)
from the grooves in the large anges of the Cylinder.
15. Using snap ring pliers, remove the Rear Rotor Bearing Retainer
(6) and pull the Rear Rotor Bearing (5) and End Plate o the rear
hub of the Rotor.
16. Remove the Motor Housing Cover Gasket (4) from the End Plate
or Motor Housing Cover.
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, clean every part and wipe every part with a
thin lm of oil before installation.
5. Check every bearing for roughness. If an open bearing must be
cleaned, wash it thoroughly clean suitable solution and dry with
a clean cloth. Sealed or shielded bearings should not be cleaned.
Work grease into every bearing before installation.
6. Apply a lm of O-ring lubricant to every O-ring before installation.
Motor Assembly
After lubricating the motor, assemble the motor as follows:
1. Slip one End Plate (7), the side with the channel going from the
central opening toward the outer edge trailing, onto the spline
end of the Rotor (25).
