17
MAINTENANCE SECTION
Disassembly of the Motor
1. Remove the Bearing Housing Spacer (27), Front
Rotor Bearing Housing (25) and the two Bearing
Spring Washers (26) from the Motor Housing (1).
2. Grasp the splined end of the Rotor (19) and pull the
assembled motor from the Motor Housing.
3. Remove the Rear End Plate Gasket (16) from the
Motor Housing.
In the following step, make certain the Rear End
Plate Retainer (18) doesn’t spring away when it is
slipped off the hub of the Rotor.
4. Using a pair of external snap ring pliers and just the
tips of the pliers inserted between the ends of the Rear
End Plate Retainer, spread the Retainer enough to
remove it from the groove in the hub of the Rotor.
5. Withdraw the Rear End Plate (17), Cylinder (21) and
Vanes (20).
6. Check the Front Rotor Bearing (24) for damage or
roughness. If replacement is necessary, support the
Front End Plate (22) between two blocks of wood on
the table of an arbor press and press the Rotor from
the Bearing.
7. Check the Rear Rotor Bearing (15) for damage or
roughness. Do not remove the Rear Rotor Bearing
unless you have a new Bearing on hand for
replacement. The old Bearing will be damaged during
the removal process. To remove the Rear Rotor
Bearing, thread a No. 10–24 x 2” long cap screw,
having at least 1/2” of thread, through the Rear Rotor
Bearing Nut (14) located behind the Bearing. Keep
tightening the screw to jack the Bearing out of the
Housing.
Disassembly of the Pistol Grip Motor Housing
1. Carefully grasp the Motor Housing (1) in
leather–covered or copper–covered vise jaws so that
the handle is upward.
2. Unscrew and remove the Inlet Bushing Assembly (8).
3. Remove the Muffler Assembly (11) and Muffler
O–ring (12) from the Muffler Assembly.
4. Withdraw the Air Strainer Screen (9), Throttle Valve
Spring (7) and Throttle Valve (6) from the housing
handle.
5. Withdraw the Trigger Assembly (3).
6. Remove the Muffler Element (13).
In the following step, only remove the Throttle
Valve Seat (5) when replacing it or when the
Trigger Bushing (2) must be replaced.
7. To remove the Throttle Valve Seat, insert a wire hook
through the central hole of the Seat and hooking the
underside of the Seat, pull the Seat out of the Motor
Housing.
8. Before removing the Trigger Bushing, all Seals and
components must be removed from the Motor
Housing.
a. Reposition the Motor Housing in leather–covered
or copper–covered vise jaws with the Trigger
Bushing upward.
In the following step, apply enough heat to
warm the Housing, but do not exceed 200
degrees Fahrenheit. Do not apply heat directly
to the Skinsulate covering. Take all precautions
necessary to avoid being burned during the
following procedure.
b. Using a torch, apply heat to the Motor Housing
around the Bushing.
c. Thread a 10–32 tap into the Bushing and pull the
Bushing out of the Housing with the tap.
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 installing the bearing in 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. Except for bearings, always clean every part and wipe
every part with a thin film of oil before installation.
5. Check every bearing for roughness. If an open bearing
must be cleaned, wash it thoroughly in a suitable
cleaning solution and dry with a clean cloth. Sealed
or shielded bearings should never be cleaned.
Work grease thoroughly into every open bearing
before installation.
6. Apply a film of O–ring lubricant to every O–ring
before installation.
7. Unless otherwise noted, always press on the stamped
end of a needle bearing when installing a needle
bearing into a bearing recess. Use a bearing inserting
tool similar to the one shown in Dwg. TPD786.
Содержание 7ADST4
Страница 13: ...MAINTENANCE SECTION 13 Dwg TPA1365 1...
