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Form P6401 Edition 6 9
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 fit in or on a
subassembly 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) off 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) off 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 flanges 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 off 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) off 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) off the rear hub of
the Motor Shaft.
8. Pull the Motor Shaft Front Bearing (35) off the front hub of
the Motor Shaft.
9. Using a gear puller, pull the Motor Shaft Gear (34) off 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.
3. Grasp the Gear Box Frame (19) and carefully separate
the assembled Frame and Gear Box Cover Assembly
(38) from the Gear Box (18) and set it aside. If the First
Stage Intermediate Gear (21) remains with the Gear Box
Frame, make certain it does not drop onto any hard
surfaces or other gearing.
4. Remove the Gear Box Gasket (20).
5. Lift the First Stage Intermediate Gear out of the Gear
Box. Pull the First Stage Intermediate Gear Rear Bearing
(22) and First Stage Intermediate Gear Front Bearing (23)
off the hubs of the Intermediate Gear. If the Bearings are
frozen on the hubs, use a bearing puller to remove them.
6. Carefully separate the Gear Box Cover Assembly from
the Gear Box Frame and remove the Gear Case Gasket.
Be careful not to allow the Motor Shaft Thrust Bearing
Race (32) or the Motor Shaft Thrust Bearing (33) to slide
off the Motor Shaft and become damaged.
7. Remove the Third Stage Intermediate Gear (31) and the
two Third Stage Intermediate Gear Bearings (30) from
either the Gear Box Frame or the Gear Box Cover
Assembly. Pull the two Bearings from the shafts of the
Gear. If the Bearings are frozen on the shafts, use a
bearing puller to remove them.
8. Pull the Intermediate Gear Pinion Rear Bearing (24) off
the rear hub of the Intermediate Gear Pinion (27).
9. Using a gear puller, pull the Second Stage Intermediate
Gear (25) from the rear hub of the Intermediate Gear
Pinion. Remove the two Shaft Keys (26).
10. Push the Intermediate Gear Pinion out the motor shaft
end of the Gear Box Frame.
11. Pull the Intermediate Gear Pinion Front Bearing (29) off
the Pinion and if the Intermediate Gear Pinion Roller
Bearing (28) must be replaced, pull it from the Pinion.
12. If the Motor Shaft Thrust Bearing and Bearing Race have
not been removed, remove them from the Shaft.
13. Push the assembled Motor Shaft out of the Gear Box
Cover Assembly.
14. Pull the Motor Shaft Front Bearing (35) off the front hub of
the Motor Shaft.
15. Using a hooked tool, pull the Motor Shaft Seal (39) out of
the Gear Box Cover.