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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 in a bearing recess.
3. 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.
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 Motor and Throttle
1. Assemble the Throttle Valve Seat Support Parts.
Tighten the Valve Seat Screw (9) to 12 in–lb (1.4 Nm)
torque. Apply O–ring Lubricant to the new Valve
Support Seals (13) before installing them on the
Throttle Valve Seat Support.
2.
Insert the Assembly in the large diameter of the
handle, Valve Seat Screw end first.
3.
Using No. 77H–154 Valve Seat Support Retainer
Pliers, install the Throttle Valve Seat Support Retainer
(15).
4. Press the Front Rotor Bearing (31) and the Front End
Plate (30) onto the rotor shaft.
5. Grasp the Rotor (28) in a vise, splined end down.
6. Place the Cylinder (27) over the Rotor, aligning the
dowel hole in the Cylinder with the dowel hole in the
Front End Plate.
7. Apply a film of light oil to each new Vane (29) and
insert a Vane, straight edge out, into each vane slot in
the Rotor. If new Vanes are required, replace the
entire set.
8. Check the large inside diameter of the Rear End Plate
Assembly (25) for wear. If the large inside diameter of
the Rear End Plate is worn to 1.516" (38.5 mm) or
larger, install a new Rear End Plate Assembly.
If the Controller Assembly must be replaced, it is
furnished with a new Rear End Plate Assembly.
Use only the End Plate Assembly furnished with the
Controller Assembly. If the Controller is good but
the Rear End Plate Assembly needs replacement,
only install a new Rear End Plate Assembly. Do not
use or interchange old parts with new Rear End
Plate Assembly components. The End Plate, Spacer
and Bearing are a matched set. Do not mix
components with those of another set.
MAINTENANCE SECTION
9. Press the Rear End Plate Assembly onto the shaft of
10. Clean the threads on the Controller Assembly (24) and
11. Remove the Rotor from the vise.
12. Insert the Cylinder Dowel (32) so it is flush with the
13. Install a new Rear End Plate Gasket (26) into the
14. Install the assembled motor into the Throttle Handle
15. Install the Motor Spacer (33) into the large end of the
16. For Wire Brush Machines, install the Planet Gear
20
The Rear Rotor Bearing is always damaged during
removal and a new Rear End Plate Assembly must
be installed.
the Controller Body making certain that the marked
end of the Rear Rotor Bearing faces toward the
Controller or rear of the Grinder. Also make certain
that the bevelled side of the Spacer faces the Cylinder
or front of the Grinder.
apply two or three drops of Loctite No. 277.
Thread the Controller onto the Rotor. Before
tightening the Controller, be certain that the dowel
holes in the Cylinder and End Plate are aligned.
Tighten the Controller to 7.5 to 8.0 ft–lb (10.1 to
10.8 Nm) torque. Do not exceed 8 ft–lb (10.8 Nm)
torque as the Controller could be damaged. Allow
Loctite to cure for six hours before putting Grinder
back in service.
Always check the free speed of the Grinder after it
has been reassembled and before it is put back into
service. Never use a Grinder with a free speed
which exceeds the maximum speed listed on the
Nameplate.
face of the Front End Plate and protrudes from the
back of the Rear End Plate Assembly.
Throttle Handle (1).
(1), making sure the Cylinder Dowel (32) aligns with
the pin hole inside the Throttle Handle.
Arbor Housing. (22).
Bearings (68) into the Planet Gears (67).
a. Install one assembled Planet Gear (67) into one of
the slots in the gear head. Make sure the shaft hole
aligns in both the Planet Gear and the gear head.
b. Press the Planet Gear Shaft (71) into the hole
opposite the tapered shaft hole in the gear head
until it is flush with the face of the gear head.
c. Install the Rotor Pinion (69) making sure the teeth
of the Planet Gear and Pinion mesh. Install the
other assembled Planet Gear into the other slot of
the gear head. Make sure the teeth of the Planet
Gear and Pinion mesh and the shaft hole aligns in
both the Planet Gear and the gear head.
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