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24
MAINTENANCE SECTION
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 Assembly
(8). Secure the Valve Seat (12), the Valve Seat
Washer (11), and the Valve Seat Lock Washer (10)
with the Valve Seat Screw (9). Tighten the Valve Seat
Screw between 0.75 to 2.25 ft–lb (1 to 3 Nm) torque.
Apply o–ring lubricant to the Valve Support Seals
(13) before installing them on the Throttle Valve Seat
Support.
2. Insert the Assembly into the large diameter of the
handle, Valve Seat Screw end first.
3. Using No. 49843–146 Retainer Pliers, install the
Throttle Valve Seat Support Retainer (15).
4. Press the Front Rotor Bearing (29), with Front End
Plate (28), onto the rotor shaft.
5. Grasp the splined end of the Rotor (26) in
leather–covered or copper–covered vise jaws.
6. Place the Cylinder (25) over the Rotor, aligning the
dowel hole in the Cylinder with the dowel hole in the
Front End Plate.
7. Apply a film of the recommended oil to each Vane
(27) 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 (23) for wear. If the large inside diameter
of the Rear End Plate is worn to 1.516” (38.506 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. The Rear Rotor Bearing is always damaged
during removal and a new Rear End Plate
Assembly must be installed.
9. Press the Rear End Plate Assembly onto the shaft of
the controller body making certain the marked end of
the Bearing faces toward the Controller or rear of the
Grinder. Also make certain that the beveled end of
the Spacer faces the Cylinder or front of the Grinder.
10. Clean the threads of the Controller Assembly (22) and
apply two or three drops of a thread locking
compound to the threads. Thread the Controller onto
the Rotor.
Before tightening the Controller, be certain that
the dowel holes in the Cylinder and End Plate are
aligned. Use the 77H–950 Controller Wrench to
tighten the Controller between 7.5 and 8.0 ft–lb
(10.1 and 10.8 Nm) torque. Do not exceed 8 ft–lb
(10.8 Nm) torque because it could damage the
Controller. Allow the thread locking compound to
cure for six hours before putting the 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 that
exceeds the maximum speed listed on the
Nameplate.
11. Remove the Rotor from the vise.
12. Insert the Cylinder Dowel (30) so it is flush with the
face of the Front End Plate and protrudes from the
back of the Rear End Plate Assembly.
13. Install a new End Plate Gasket (24) into the Throttle
Handle (1).
14. Install the assembled motor into the Throttle Handle
(1), making sure the Cylinder Dowel (30) aligns with
the pin hole inside the Throttle Handle.
Assembly of the Bevel Pinion Driver
1. For GRP15A Models:
a. Install the Planet Gear Bearings (37) into the
Planet Gears (36).
b. Install an assembled Planet Gear into one of the
slots in the gear head. Make sure the shaft hole
aligns in both the Planet Gear and the gear head.
c. Press the Planet Gear Shaft (34) into the hole
opposite the tapered shaft hole in the gear head
until it is flush with the face of the gear head.
d. Install the Rotor Pinion (35), making sure the teeth
of the Planet Gear and Rotor Pinion mesh. Install
the other assembled Planet Gear into the
remaining slot of the gearhead. Make sure the
teeth of the Planet Gear and the Rotor Pinion mesh
and the shaft hole aligns in both the Planet Gear
and gear head.
e. Press the other Planet Gear Shaft (34) into the hole
opposite the tapered shaft hole in the gear head
until it is flush with the face of the gear head.
Lubricate the Gearing liberally with IRAX
No. 68–1LB Grease.