18
MAINTENANCE SECTION
Needle Bearing Inserting Tool
SHOULDER TO
REGULATE DEPTH
PILOT TO FIT I.D. OF
BEARING.
LENGTH OF PILOT TO BE
APPROXIMATELY 1/8”
LESS THAN LENGTH OF
BEARING
(Dwg. TPD786)
Assembly of the Pistol Grip Motor Housing
1. If the Trigger Bushing (2) was removed, proceed as
follows:
a. Put a few drops of sealant on the end of a thin
stick and insert the stick into the trigger bushing
hole of the Motor Housing (1). Work the stick so
that the Sealant flows against the shoulder inside
the Housing.
b. Insert the Trigger Bushing into the Motor
Housing to a depth approximately one–half
he length of the Bushing.
c. Put a few drops of sealant in the counterbore
surrounding the outside diameter of the Bushing.
d. Rotate the Bushing approximately 180 degrees to
make certain the Sealant makes complete contact
around the outside of the Bushing.
e. Push the Bushing into the Housing until it bottoms
against the shoulder inside the Housing.
f. Allow the Sealant to cure for eight hours at room
temperature.
2. Carefully grasp the Motor Housing in leather–covered
or copper–covered vise jaws, inlet end facing upward.
3. If the Throttle Valve Seat (5) was removed, use a
flat–faced rod 1/2” (13 mm) in diameter by 3”
(76 mm) long to push the Seat into the Motor Housing
until it seats.
4. Press the Trigger (3) onto the grooved end of the
Trigger Pin so that it is at right angles to the hole in
the opposite end of the Pin.
5. Insert the Trigger Assembly into the Trigger Bushing
so that the hole in the Trigger Pin aligns dead center
with the hole in the Throttle Valve Seat.
6. Fold or roll the Muffler Element (13) and work it into
the exhaust cavity in the handle of the Motor
Housing.
7. Using needle nose pliers to hold the short stem end of
the Throttle Valve (6), install the Valve inserting the
long stem end through the hole in the Throttle Valve
and Trigger Pin.
8. Place the Air Strainer Screen (9), closed end first,
inside the large end coil of the Throttle Valve
Spring (7).
9. Insert the Throttle Valve Spring and Screen, small coil
end first, so that the Spring encircles the end of the
Throttle Valve.
10. Apply a thin coat of O–ring lubricant to the Muffler
O–ring (12) and install the O–ring on the hub of the
Muffler (11).
11. Install the Inlet Bushing Spacer (10) in the large hole
in the Muffler Assembly (11).
12. Place the Muffler Assembly on the face of the handle
so that the hub with the Muffler O–ring extends into
the handle.
13. Thread the Air Inlet Bushing (8) into the large hole in
the Muffler Assembly. Tighten the Bushing to a
minimum of 25 ft–lb (34 Nm) torque.
Assembly of the Motor
1. If the Rear Rotor Bearing (15) was removed, install a
new one as follows:
a. Place the Rear Rotor Bearing Nut (14) in the bore
at the bottom of the bearing recess in the Motor
Housing (1).
b. Using a needle bearing inserting tool that has a
pilot extending into the Bearing, and a shoulder
that contacts the the outer radius on the bearing
shell, press the Rear Rotor Bearing, unstamped
end first, into the bearing recess until it is about
0.010” (0.25 mm) below flush.
c. Inject a little grease into the Bearing.
2. Slide the Front End Plate (22), flat side first, over the
splined end of the Rotor (19).
3. Using a sleeve that contacts only the inner ring of
the Front Rotor Bearing (24), press the Front Rotor
Bearing onto the splined hub of the Rotor until it seats
against the Front End Plate.
4. The clearance between the Front End Plate and Rotor
is critical. While holding the Front End Plate, gently
tap the front end of the Rotor until you can insert a
0.001” feeler gauge or shim between the face of the
Rotor and End Plate.
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