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3
WARNING
Do not remove the Mounting Plate Pin (45) unless it is bent or
broken. The Mounting Plate Pin is the alignment pin for the
Sander Arbor Retaining Plate. Use pliers to remove the Mounting
Plate Pin if removal is necessary and a new pin is on hand.
7. Remove the Angle Arbor Housing from the vise.
8. Lay the Angle Arbor Housing (43) on a workbench, guard side
down. Lightly tap the Angle Arbor Housing with a soft hammer to
release the Upper Arbor Bearing (47) and Upper Bearing Spring
Washer (46).
NOTICE
A thread locking compound was applied to the threads of the
Bevel Gear Nut (48) during assembly. It may be necessary to
warm the Nut with a propane torch in order to remove it. Use
only enough heat to warm the Nut for removal. Do not overheat.
9. Grasp the flats of the Sander Arbor (55) in leather-covered or
copper-covered vise jaws, arbor bearing end up. Using a wrench,
remove the Bevel Gear Nut.
10. Remove the Bevel Gear Spacer (49) and Bevel Gear (40).
11. Press the Arbor Lower Bearing Assembly (50) from the Arbor.
Remove the Lower Arbor Spring Washer (51). Remove the Arbor
from the vise.
Disassembly of the Throttle Lever and Inlet
Grasp the flats of the Throttle Handle (1) in leather-covered or
copper-covered vise jaws, air inlet up.
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.
Drive out the Throttle Lever Pin (16) to release the Throttle Lever
Assembly (17).
Remove the Throttle Handle from the vise.
Using a soft hammer, tap the arbor end of the housing to release
the Throttle Valve Assembly (2), or using snap ring pliers, pull the
Assembly from the Throttle Handle. Remove the two Seals (3).
Disassembly of the Motor and Throttle
Grasp the Angle Arbor Housing (43) horizontally in leather-
covered or copper-covered vise jaws.
Using No. 77H-281 Coupling Nut Wrench, remove the Coupling
Nut (21).
Grasp the Throttle Handle (1) and pull the Handle from the Arbor
Housing.
Grasp the splined end of the Rotor (26) and pull the motor from
the Throttle Handle.
Remove the Cylinder Dowel (30).
Grasp the splined end of the Rotor in leather-covered or copper-
covered vise jaws.
Remove the Front End Plate (28) and Front Rotor Bearing (29)
from the Rotor.
If the Front Rotor Bearing needs to be replaced, press it from the
Front End Plate.
Lift off the Cylinder (25).
Remove the Vanes (27).
NOTICE
A thread locking compound was applied to the threads of the
Rotor during assembly to prevent the Controller Assembly
(22) from loosening during operation. Before attempting to
unscrew the Assembly from the Rotor, apply moderate heat from
a propane torch to the middle of the rotor body to soften the
compound. Do not overheat the Rotor. Heat it only long enough
to allow the Controller Assembly to be unscrewed without using
excessive force.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
CAUTION
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 No. 77H-950 Controller Wrench, unscrew and remove the
Controller Assembly (22).
NOTICE
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.
12. If the Rear End Plate Assembly (23) consisting of the Rear End
Plate, Spacer and Rear Rotor Bearing needs to be replaced, press
it from the Controller.
13. Remove the Rear End Plate Gasket (24).
14. Using No. 77H-154 Retainer Pliers, remove the Throttle Valve Seat
Support Retainer (15).
15. Grasp the Throttle Handle horizontally in leather-covered or
copper-covered vise jaws. 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).
16. Remove the Valve Seat Screw (9), Valve Seat Lock Washer (10),
Valve Seat Washer (11), Valve Seat (12) and Valve Support
Seals (13).
17. Check the Oiler Feeder Plug (14). Replace if necessary.
Disassembly of the Bevel Pinion Driver
For Model 77A25F107:
Lightly tap the Angle Arbor Housing (43) to release the Bevel
Pinion Driver (31).
Remove the Internal Gear (32).
Remove the Bevel Pinion Driver Bearing (33). This is a light press
fit.
Check the Planet Gears (36) and Planet Gear Bearings (37) for
wear. If they need to be replaced, proceed as follows:
NOTICE
Always remove the Planet Gear Shafts (34) in the direction
shown on the drawing.
Using a pin punch and soft hammer, remove the Planet Gear
Shaft.
Remove the Planet Gear Assembly (36).
Remove the Planet Gear Bearing (37) from inside the Planet
Gear.
Remove the Rotor Pinion (35).
NOTICE
Always replace both Planet Gears even if only one Planet Gear
shows wear.
e. Remove the second Planet Gear as previously instructed.
5. Unscrew and remove the Pinion (40).
NOTICE
If the Pinion is worn or broken, replace both the Pinion and Bevel
Gear as they are a matched set and cannot be matched with
other Bevel Gears.
6. Press the Bevel Pinion Bearing (39) from the Bevel Pinion Driver.
7. Remove the Thrust Spacer (38).
1.
2.
3.
4.
a.
b.
c.
d.
