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Disassembly of the Throttle Lever and Inlet
1. Grasp the flats of the Throttle Handle (1) in a vise, Air
inlet up.
2. 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.
3. Drive out the Throttle Lever Pin (16) to release the
Throttle Lever Assembly.
4. Remove the Throttle Handle from the vise.
5. Using a soft hammer, tap the arbor end of the housing
to release the Throttle Valve Assembly (2), or using
lock ring pliers, pull the Assembly from the Throttle
Handle. Remove the two Seals (3).
Disassembly of the Motor and Throttle
1. Grasp the Arbor Housing (22) horizontally in a vise.
2. Using No. 77H–281 Coupling Nut Wrench, remove the
Coupling Nut (21).
3. Grasp the Throttle Handle (1) and pull the handle from
the Arbor Housing.
4. Grasp the splined end of the Rotor (28) and pull the
motor from the Throttle Handle.
5. Remove the Cylinder Dowel (32).
6. Grasp the splined end of the Rotor in leather–covered
or copper–covered vise jaws.
7. Remove the Front End Plate (30) and Front Rotor
Bearing (31) from the Rotor.
8. If the Front Rotor Bearing needs to be replaced, press
it from the Front End Plate.
9. Lift off the Cylinder (27).
10. Remove the Vanes (29).
Loctite* No. 277 was applied to the threads of the
Rotor during assembly to prevent the Controller
Assembly (24) from loosening during operation.
Before attempting to to unscrew the assembly from
the Rotor, apply moderate heat from a propane
torch to the middle of the rotor body to soften the
Loctite. Do not overheat the Rotor. Heat it only
long enough to allow the Controller Assembly to be
unscrewed without using excessive force.
Use only the special 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 Grinder
if it is not abused.
11. Using the No. 77H–950 Controller Wrench, unscrew
and remove the Controller Assembly (24).
*
Registered trademark of Loctite Corporation.
MAINTENANCE SECTION
12. If the Rear End Plate Assembly (25) consisting of the
13. Remove the Rear End Plate Gasket (26).
14. Using No. 77H–154 Valve Seat Support Retainer
15. Grasp the Throttle Handle (1) horizontally in a vise.
16. Remove the Valve Seat Screw (9), Valve Seat Lock
17. Check the Oiler Feeder Plug (14). Replace if
18. Place the Arbor Housing (22), arbor end up on a
19. For Wire Brush Machines, lightly tap the protruding
20. Remove the Internal Gear (72).
21. Remove the Gear Frame Bearing (70). This is a light
22. Check the Planet Gears (67) and the Planet Gear
19
The Rear End Plate, Spacer and Bearing are a
matched set. Do not mix the components with those
of another set. The Rear Rotor Bearing is always
damaged during the removal process, and a
complete new Rear End Plate Assembly must be
installed.
Rear End Plate, Spacer and Bearing needs to be
replaced, press it from the Controller.
Pliers, remove the Throttle Valve Seat Support
Retainer (15).
Using a brass rod 8" (204 mm) long inserted into the
air inlet end of the handle, lightly tap the brass rod
with a soft hammer to release the Throttle Valve Seat
Support Assembly (8).
Washer (10), Valve Seat Washer (11), Valve Seat (12)
and Valve Support Seals (13).
necessary.
workbench. Lightly tap the end of the Arbor Housing
with a soft hammer to release the Motor Spacer (33).
end of the arbor with a soft hammer to release the
Wire Brush Arbor (39).
press fit.
Bearings (68) for wear. If they need to be replaced,
proceed as follows:
a. Using a pin punch and soft hammer, remove the
Planet Gear Shaft (71).
b. Remove the Planet Gear Assembly (67).
c. Remove the Planet Gear Bearing (68) from inside
the Planet Gear.
d. Remove the Rotor Pinion (69).
e. Remove the second Planet Gear as in steps (a)
through (c).
Always replace both Planet Gears and the Rotor
Pinion even if only one Gear shows wear. Carefully
check the Internal Gear and replace if necessary.
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