Item Description Part Number Item Description Part Number
• 33 Motor Shaft Thrust Bearing 37 Motor Shaft Key
for Series 92NB or 92RB 48NB-769 for Series 92NA or 92RA 107-54
34 Motor Shaft Gear for Series 92NB or 92RB R5H51-768
for Model 92NA005 or 92RA005 48NA-756-005 38 Gear Box Cover Assembly
for Model 92NA008 or 92RA008 48NA-756-008 for Series 92NA or 92RA 48NA-A751
for Model 92NA011 or 92RA011 48NA-756-011 for Series 92NB or 92RB 48NB-A751
for Model 92NA014 or 92RA014 48NA-756-014 • 39 Motor Shaft Seal
for Model 92NA017 or 92RA017 48NA-756-017 for Series 92NA or 92RA 48NA-759
for Model 92NA022 or 92RA022 48NA-756-022 for Series 92NB or 92RB 48NB-759
• 35 Motor Shaft Front Bearing 40 Vent Plug 48NA-368
for Series 92NA or 92RA C6H20A-518 41 Gear Box Cover Cap Screw (11)
for Series 92NB or 92RB 48NB-766 for Series 92NA or 92RA R0H-354-4
36 Motor Shaft for Series 92NB or 92RB 48NB-354
for Series 92NA or 92RA 48NA-757-4 42 1/4 Lock Washer (11) 8U-58
for Model 92NB029, 92RB029
92NB036, 92RB036,
92NB045 or 92RB045
48NB-762-029
43 Oil Plug (12 for Series 92NB or
92RB; 11 for others) R2-227
* Nameplate 92N-301
for Model 92NB078 or 92RB078 48NB-762-078 * Nameplate Screw (3) 20BM-302
* Not illustrated
• To keep downtime to a minimum, it is desirable to have on hand certain repair parts. We recommend that you stock one (pair or set) of each
part indicated by a bullet (•) for every four motors in service.
92N and 92R Series Parts List (Continued)
Maintenance Section
Disassembly
General Instructions
1. Do not disassemble the motor any further than necessary to
replace or repair damaged parts.
2. Do not disassemble the motor unless you have a complete set of
new gaskets and O-rings for replacement.
3. When grasping a motor or part 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
sub-assembly unless the removal of that part is necessary for
repairs or replacement.
5. 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.
Disassembly of the Motor
1. Remove the Vent Plug (40) and positioning the Drain Plug (43)
over a container, remove the Drain Plug and drain the lubricant
from the Gear Box (18). Clamp the mounting foot of the Gear Box
to the work bench.
2. Remove the Housing Cover Cap Screws (2) and Washers (3).
3. Grasp the Motor Housing (11) and Motor Housing Cover (1) and
separate the motor parts from the Gear Box.
4. Separate the Motor Housing Cover from the Motor Housing and
being careful not to damage the Cylinder Seals (8A), grasp the
spline end of the Rotor (12) and pull the assembled motor out of
the Motor Housing.
5. Pull the Front Rotor Bearing (13), Front Rotor Bearing Spacer
Assembly (14) and Front End Plate (7) o the hub of the Rotor.
6. Peel the Gear Case Gasket (17) from the End Plate. If portions of
the Gasket remain adhered to the End Plate, use a scrapper made
from a non-damaging material such as nylon, to scrap the Gasket
and adhesive from the End Plate.
7. Pull the Cylinder (8) and Cylinder Dowel (9) o the Rotor and
remove the Vanes (10) from the vane slots in the Rotor.
8. Remove the two Cylinder Seals (8A) from the grooves in the large
anges of the Cylinder.
9. 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.
10. Peel the Motor Housing Cover Gasket (7) from the End Plate. If
portions of the Gasket remain adhered to the End Plate, use a
scrapper made from a non-damaging material such as nylon, to
scrap the Gasket and adhesive from the End Plate.
Disassembly of Series 92NA and 92RA Gearing
1. Unscrew and remove the eleven Gear Box Cover Cap Screws (41)
and Lock Washers (42).
2. Remove the Motor Shaft Key (37) and lay the assembled gear box
on a workbench with the Motor Shaft (36) upward.
3. Carefully separate the Gear Box Cover Assembly (38) from the
Gear Box (18) and set it aside. If the Intermediate Gear (21)
remains with the Gear Box Cover, make certain it does not drop
onto any hard surfaces or other gearing.
4. Remove the Gear Box Gasket (20).
5. Lift the Intermediate Gear out of the Gear Box. Pull the First Stage
Intermediate Gear Rear Bearing (22) and First Stage Intermediate
Gear Front Bearing (23) o the hubs of the Intermediate Gear.
If the Bearings are frozen on the hubs, use a bearing puller to
remove them.
6. Push the assembled Motor Shaft out of the Gear Box Cover
Assembly.
7. Pull the Motor Shaft Rear Bearing (24) o the rear hub of the
Motor Shaft.
8. Pull the Motor Shaft Front Bearing (35) o the front hub of the
Motor Shaft.
9. Using a gear puller, pull the Motor Shaft Gear (34) o the rear of
the Motor Shaft. Remove the two Shaft Keys (26).
10. Using a hooked tool, pull the Motor Shaft Seal (39) out of the
Gear Box Cover.
Disassembly of Series 92NB and 92RB Gearing
1. Unscrew and remove the eleven Gear Box Cover Cap Screws (41)
and Lock Washers (42).
2. Remove the Motor Shaft Key (37) and lay the assembled gear box
on a workbench with the Motor Shaft (36) upward.
