19
MAINTENANCE SECTION
Assembly Maintenance Instructions
1.
Press the Rear Rotor Bearing (34), shielded side first,
into the recess in the Rear End Plate (36) with an
arbor that will contact only the bearing outer race.
Press on the bearing inner race when installing the
assembly on the hub of the Rotor (31).
2.
Press the Front Rotor Bearing (35), shielded side first,
onto the front hub of the Rotor with a sleeve that will
clear the pinion and contact only the bearing inner
race.
3.
After installing one End Plate and Rotor Bearing on
the rotor hub, insert a Vane (38) into each slot in the
Rotor. Place the Cylinder (39) over the Rotor and
against the installed End Plate being sure the Cylinder
is positioned with its flattened rim toward the pinion
end of the Rotor so that the flats will coincide with
those on the Front End Plate when the motor is
assembled.
The Governor Assembly (22) has left–hand
threads.
4.
When installing a new Governor Assembly, screw the
Adjusting Nut onto the governor stem until the proper
dimension “A” is 1–27/32” (47 mm). This will
usually result in the proper governed free speed.
However, this is only an approximate setting and
further adjustment may be necessary. Screw the nut
farther onto the stem to increase the speed; back it off
to decrease the speed. The correct governed free
speeds for Model 44SMA Drills is 155 rpm.
GOVERNOR ADJUSTMENT
(Dwg. TPD497)
5.
Be sure both rubber Air Port Gaskets (6) are in good
condition and are positioned, lip side first, in the air
ports in the Motor Housing (1) before installing the
Multi–Vane motor in the Motor Housing.
6.
Draw the Backhead (14) evenly against the Backhead
Gasket (21) on the face of the Motor Housing by
turning each Backhead Cap Screw (88) a little at a
time until all are tight.
7.
Note the stamping “THRUST HERE” on one side of
the Spindle Thrust Bearing (66). Install the Bearing
unstamped side first on the spindle hub.
8.
Assemble the Spindle (41) and gearing in the Gear
Case (53). Install this assembly as a unit on the
Motor Housing.
MAINTENANCE TOOLS
TOOL NAME
OPERATION
TOOL NUMBER
FOR ORDERING
Grease Gun
Lubrication
P25–228
Spindle Packing Nut Spanner Wrench
Removing and installing the Spindle
Packing Nut (59) on the Gear Case
(53).
T1SE–26
Gear Frame Set Screw Wrench
(3/16” hexagon key)
Removing or installing the Gear
Frame Set Screws (46) in the Planet
Gear Frame (45).
JA4–478
