16573321_ed3
3
9. Pull the Front Rotor Bearing (29), Rotor Spacer Assembly (27) and
Front End Plate Assembly (25) off the hub of the Rotor. If the Seal
Cup Assembly (28) must be replaced, pull the Assembly off the
Rotor Spacer.
Disassembly of the Throttle
1. Using one wrench on the Throttle Handle Assembly flats and
another wrench on the Inlet Bushing (4), unscrew the Inlet
Bushing and remove the Air Strainer Screen (5), Throttle Valve
Spring (6) and the Throttle Valve (7) from the handle.
2. If the Throttle Valve Seat (8) must be removed, insert a hooked
rod through the central opening in the Seat and, catching the
underside of the Seat, pull the Seat from the handle.
CAUTION
The Throttle Lever Pin must be pressed from the throttle
handle in a specific direction. Refer to the Parts Information
manual 16573263. Failure to remove the Pin correctly will
distort or damage the throttle handle.
NOTICE
The pin hole in one side of the Lever is larger than the other
to facilitate removal and installation. Removing the Pin will
allow the Lever Lock Spring (16) and Lever Lock (14) to be
removed.
3. To remove the Throttle Lever Assembly (13), press the Throttle
Lever Pin (11) out of the throttle handle.
4. Lift off the Throttle Lever Assembly.
5. If it is necessary to disassemble Throttle Lever Assembly (13), use a
pin punch and hammer to drive the Lever Lock Pin (15) out the side
of the Lever as shown in the Parts Information manual 16573263.
6. To remove the Throttle Plunger Assembly (9), grasp the Plunger
in copper-covered vise jaws and with a twisting action, pull the
handle off the Plunger over the Throttle Plunger Stop (10).
7. To remove the Throttle Plunger Bushing (2), proceed as follows:
Grasp the flats of a 1/4”-20 tap in copper-covered vise jaws
with the thread cutting end upward.
Thread the Bushing (with the handle) onto the tap.
CAUTION
Do not heat the handle to remove the Bushing. Heat may cause
damage to factory installed internal components.
c. Using a plastic hammer, sharply rap the handle several times
in the bushing area to loosen the retaining compound. Pull
the handle with a twisting motion from the Bushing.
a.
b.
Assembly
General Instructions
1. Always press on the inner ring of a ball-type bearing when
installing the bearing on a shaft.
2. Always press on the outer ring of a ball-type bearing when
pressing the bearing into a bearing recess.
3. Whenever grasping a tool or part in a vise, always use leather-
covered or copper-covered vise jaws. Take extra care with
threaded parts and housings.
4. Always clean every part and wipe every part with a thin film of oil
before installation.
5. Apply a film of O-ring lubricant to all O-rings before final assembly.
Assembly of the Throttle
1. If the Throttle Plunger Bushing (2) was removed, proceed as follows:
Insert the Throttle Plunger Bushing into the Throttle Handle
Assembly (1) to a depth approximately one-half the length of
the Bushing.
Put a few drops of M. I. Hernon No. 822 sealant completely
around the outside surface of the Bushing.
Rotate the Bushing approximately 180° to make certain the
sealant makes complete contact around the outside of the
Bushing.
Push the Bushing into the handle until it bottoms against the
shoulder inside the handle.
Allow the sealant to cure for eight hours at room temperature.
2. Install the Throttle Plunger Stop (10) in the annular groove in the
Throttle Plunger (9).
NOTICE
Make certain the Throttle Plunger Stop enters the tool air
flow chamber.
3. With the Stop lubricated and using a turning motion, insert the
assembled Throttle Plunger, Seal end leading, into the Bushing.
4. If the Throttle Lever Assembly (13) was disassembled, proceed as
follows:
Using a No. 43 drill or a piece of metal rod slightly under 0.090”
diameter as a slave pin, position the Lever Lock (14) and Lever
Lock Spring (16) in the Throttle Lever Assembly (13). Make
certain the ends of the Spring are toward the tool inlet and
the narrow end of the Lever Lock is toward the handle.
Check the functioning of the Lever Lock. If the Lock flattens
against the Lever when the top portion of the Lock is pushed
forward and returns to vertical when the Lock is released, it is
assembled properly.
a.
b.
c.
d.
e.
a.
b.
While controlling the slave pin, start the Lever Lock Pin (15)
into the side of the Lever as shown in the Drawing Parts
Information Manual 16573263.
While maintaining control of the slave pin, and using a
hammer, tap the Lever Pin into position.
CAUTION
The Throttle Lever Pin must be pressed into the throttle handle
in a specific direction. Refer to the Parts Information Manual
16573263. Failure to install the Pin correctly will distort or
damage the throttle handle.
5. Position the Throttle Lever Assembly (13) on the Throttle Handle
Assembly and press the Throttle Lever Pin (11) into position
securing the Lever Assembly to the handle.
6. If the Throttle Valve Seat (8) was removed, use a flat-faced rod 3/4”
(19 mm) in diameter by 4” (100 mm) long to push the Valve Seat
into the handle until it seats.
7. Rotate the Throttle Plunger Assembly until the hole in the Plunger
aligns dead center with the hole in the Throttle Valve Seat.
8. Using needle nose pliers to hold the short stem of the Throttle
Valve (7), install the Valve inserting the long stem end through
the hole in the Throttle Valve Seat and Throttle Plunger.
9. Install the Throttle Valve Spring (6), small end first, over the short
stem of the Throttle Valve.
10. Insert the Air Strainer Screen (5), closed end leading, into the
large end of the Valve Spring.
11. Install the Inlet Bushing (4) and tighten it between 74
and 100 ft-lb (100 and 135 Nm) torque.
Assembly of the Motor
1. Clamp the large body of the Rotor (23) in leather-covered or
copper-covered vise jaws with the longer spindle shaft upward.
2. Apply a small drop of a suitable thread-locking compound to the
bottom of the O-ring groove at each of the four areas shown in
Dwg. TPD1083 of the Front End Plate Assembly (25).
c.
d.
Summary of Contents for 61H Series
Page 7: ...Notes...
