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Assembly of the Motor
1. Press the Cylinder Dowel Retainer (2) out the rear of
the Motor Housing (1).
2. Press a new Front Rotor Bearing (48) into the Front
End Plate (47).
3. Stand the Rotor (45) on the table of an arbor press
with the spline shaft upward. Place a 0.001" shim on
the face of the large rotor body and press the
assembled Bearing and End Plate, Bearing trailing,
onto the rotor shaft. Press on the inner race of the
Bearing and continue pressing until the shim drags
between the End plate and rotor body.
4. Grasp the assembled Rotor in copper–covered or
leather–covered vise jaws with the Front End Plate
downward. Wipe each Vane (46) with a film of oil
and insert a Vane into each of the rotor vane slots with
the straight edge of the Vane away from the body.
5. Install the Cylinder (43) over the rotor body against
the Front End Plate. Make certain the end of the
Cylinder with the two large holes in the cylindrical
surface is nearest the Front End Plate.
6. Install the Rear End Plate (42) followed by the Rear
Rotor bearing (41) on the rear hub of the Rotor.
Position the end plate face with the kidney shaped
slots against the Cylinder.
7. Install the Rear Rotor Bearing Retainer (40) in the
groove on the rear rotor hub to retain the Bearing and
End Plate.
8. Align the dowel holes in both End Plates with the
dowel hole in the Cylinder of the assembled motor
and insert a 5/32" diameter rod about 10" (254 mm)
long through the holes, allowing the excess to
protrude out the Rear End Plate.
9. Before installing the motor, make certain that both
rubber Air Port Gaskets (4) are in good condition and
are installed, large bore first, in the two recesses in
the motor housing wall.
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MAINTENANCE SECTION
10. From the motor end of the housing, insert the
11. Slide the Motor Lock Plate (49) over the end plate
12. Withdraw the assembly rod and install the Cylinder
Assembly of the Impact Mechanism
40
protruding end of the rod through the hole from which
the Cylinder Dowel Retainer was removed. Slide the
assembled motor into the Motor Housing, being
certain to keep the opposite end of the rod seated in
the Front End Plate. Do not remove the assembly rod
at this time.
hub and start the three Motor Lock Plate Screws (50)
and Lock Washers (51) into the Motor Housing.
Alternately turn each Screw a little at a time until all
are tight.
Dowel (44) in its place. Press the Cylinder Dowel
Retainer in flush with the contour of the Housing.
1. For Model 5020T or 5020TDQ, use a needle bearing
inserting tool and press a new Planet Gear Bearing
(58) into each of the Planet Gears (57).
For Model 5040T or 5040TDQ, press a Planet Gear
Bushing (58) into each of the Planet Gears (57).
2. Slide the assembled Planet Gears into the Planet Gear
Frame (56) and secure them by pressing the Planet
Gear Shafts (59) in place from the gear end of the
Frame. Do not press the Pins from the shaft end of the
Gear Frame. The holes are tapered and the Gear
Frame will be damaged.
3. Stand the Planet Gear Frame, bearing end down,
on the table of an arbor press and slide the Hammer
Spring Thrust Bearing Race (64), cupped side first,
over the gear frame shank.
4. Slip the Hammer Spring (65) over the gear frame
shank and set it on the Bearing Race.
5. Align the points of the cam grooves inside the
Hammer (66) with the points of the cam grooves in
the gear frame shank and slide the Hammer onto the
shank and over the Spring.
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