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.
