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16575128_ed2
For Model 77A45W109, 77A60W107, 77A60P107, 77A60P109 or
77A75P107:
Lightly tap the Angle Arbor Housing (43) to remove the Motor
Spacer (41), Arbor Coupling (42), Thrust Spacer (38), Bevel Pinion
Bearing Assembly (39), and the Bevel Pinion Driver (31).
Unscrew and remove the Bevel Pinion (40).
NOTICE
If the Pinion is worn or broken, replace both the Pinion and
the Bevel Gear as they are a matched set and cannot be
matched with other Bevel Gears.
3. Press the Bevel Pinion Bearing (39) from the Bevel Pinion Driver.
Assembly
General Instructions
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 into a bearing recess.
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.
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 final
assembly.
Assembly of the Motor and Throttle
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.
Insert the Assembly into the large diameter of the handle, Valve
Seat Screw end first.
Using No. 77H-154 Retainer Pliers, install the Throttle Valve Seat
Support Retainer (15).
Press the Front Rotor Bearing (29), with Front End Plate (28), onto
the rotor shaft.
Grasp the splined end of the Rotor (26) in leather-covered or
copper-covered vise jaws.
Place the Cylinder (25) over the Rotor, aligning the dowel hole in
the Cylinder with the dowel hole in the Front End Plate.
Apply a film of light 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.
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.
NOTICE
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
bevelled end of the Spacer faces the Cylinder or front of the
1.
2.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
6.
7.
8.
Grinder.
10. Clean the threads of the Controller Assembly and apply two or
three drops of a thread-locking compound to the threads. Thread
the Controller onto the Rotor.
CAUTION
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.
WARNING
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, making sure
the Cylinder Dowel aligns with the pin hole inside the Throttle
Handle.
Assembly of the Bevel Pinion Driver
For Model 77A25F107:
Install the Planet Gear Bearings (37) into the Planet Gears (36).
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.
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.
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 gear
head. 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.
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
Ingersoll Rand
No. 68 Grease.
Press the Bevel Pinion Driver Bearing (33) onto the gear head
end of the Bevel Pinion Driver (31).
Install the Internal Gear (32) over the gear head end of the
Bevel Pinion Driver, making sure the splines of the Internal
Gear mesh with the Planet Gear teeth.
Install the Thrust Spacer (38) over the threaded end of the
Bevel Pinion Driver.
Press the Bevel Pinion Bearing (39) onto the Bevel Pinion
Driver.
NOTICE
If the Pinion (40) needs to be replaced, replace both the
Pinion and Bevel Gear. They are a matched set and cannot
be matched with other Bevel Gears.
j. Check the Pinion for worn or broken teeth.
k. Screw the Pinion onto the threaded Bevel Pinion Driver and
tighten to 14 to 19 ft-lb (19 to 26 Nm) torque.
For Model 77A45W109, 77A60W107, 77A60P107, 77A60P109 or
77A75P107:
1.
a.
b.
c.
d.
e.
f.
g.
h.
i.
