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Disassembly of the Arbor
1. Grasp the Arbor Housing (29) in a vise, guard
upward.
2. Use an appropriate spanner wrence inserted into the
pinhole of the flange to hold the Arbor. Unscrew the
Wheel Nut (51) with an open–end wrench. Remove
the Wheel Flanges (52).
3.
Unscrew the Guard Screws (53). Remove the Guard
Screw Lock Washer (54) and the Wheel Guard (55).
4.
Lift the Arbor (56) and the Arbor Coupling (50) from
the Arbor Housing. Pull the Arbor Coupling off the
Arbor.
5.
Grasp the Arbor in a vise, spline end up.
6.
With pliers, straighten the tangs of the Bearing Lock
Washer (58). Unscrew the Bearing Locknut (57) and
remove the Bearing Lock Washer.
7.
If the Arbor Bearing (59) is to be replaced, press it
from the arbor shaft.
Disassembly of the Motor and Throttle
1. Using the No. R2J–562 Deflector Screw Wrench,
remove the Exhaust Deflector Screws (28) and lift off
the Exhaust Deflector (25), Exhaust Deflector Gasket
(26A), Exhaust Diffuser (27) in models where used
and Exhust Baffle (26).
2.
Grasp the Arbor Housing (29) in a vise.
3.
Unscrew the Arbor Housing Screws (30) and remove
the Lock Washers (31).
4.
Lift off the Throttle Handle Assembly (1) to expose
the motor.
5.
Remove the Arbor Housing Gasket (32).
6.
Grasp the Controller Assembly (35) by hand and pull
the motor unit out of the Arbor Housing.
7.
Remove the Arbor Housing from the vise. Turn over
the Arbor Housing and the two Motor Clamp Washers
(49) will drop out.
8.
Grasp the Rotor Shaft (48) in the vise.
9.
Remove the Controller Retaining Nut (34) and
unscrew the Controller Assembly.
Use only the special 99V60–950 Controller Wrench
for removing the Controller Assembly. Do not
attempt to disassemble the Controller. It is
available only as a unit and is guaranteed for the
life of the tool if it is not abused.
10. Lift off the Rear End Plate Gasket (33).
11. Set the Bearing Cage (37) on blocks in an arbor press.
Using a metal sleeve fitting the inner race of the Rear
Rotor Bearing (36), press off the Bearing Cage.
12. If the Rear Rotor Bearing needs to be replaced, insert
the Rear Rotor Bearing into the 99V60–A952 Bearing
MAINTENANCE SECTION
13. Lift off the Rotor Bearing Seal (36), and Rear End
14. Lift off the Cylinder (40).
15. Remove the Vanes (44).
16. Withdraw the Rotor (43) and lift out the Rotor Key
17. Remove the rotor shaft and end plate assembly from
18. If the Front Rotor Bearing (47) is to be replaced, press
19. Unscrew the Oil Chamber Plug from the Throttle
20. Place the Throttle Handle Assembly in a vise to
21. Drive out the Throttle Lever Pin (13) to release Lever
22. Remove the Throttle Valve Spring (6) and release the
23. Release the Throttle Valve Seat Support Assembly (7)
24. Remove the Valve Seat Screw (8), Valve Screw Lock
General Instructions
1.
2.
3.
4.
5.
18
Clamp and tighten the nut on the fixture. Insert the
99V60–951 Seal Pressing Tool in the center of the
Rear Rotor Bearing and press off the Controller.
Release the clamp.
Plate (39).
(45).
the vise. Grasp the Front End Plate (46) in one hand
and tap the small diameter end of the rotor shaft with
a soft hammer to remove the end plate.
it from the rotor shaft.
Handle Assembly and pour the oil from its reservoir.
remove the Inlet Bushing (4), Inlet Bushing Screen
(5) and the Throttle Valve Spring (6). The Bushing
has an interference thread and is tightly fit.
Assembly (14).
Throttle Valve (2) by tapping the end of the handle
with a soft hammer or by using lock ring pliers.
by tapping the end of the handle with a soft hammer.
Washer (9), Valve Seat Washer (10) and Valve Seat
(11). The Air Strainer Screen (12) may now be
cleaned.
ASSEMBLY
Always press on the inner ring of a ball–type bearing
when installing the bearing on a shaft.
Always press on the outer ring of a ball–type bearing
when pressing the bearing in a bearing recess.
Whenever grasping a tool or part in a vise, always use
leather–covered or copper–covered vise jaws to
protect the surface of the part and help prevent
distortion. This is particularly true of threaded
members and housings.
Always clean every part, and wipe every part with a
thin film of oil before installation.
Apply a film of O–ring Lubricant to all O–rings
before installation.
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