22
MAINTENANCE SECTION
Disassembly of Gearing Case Assembly
1. Clamp the Gear Case Assembly (76) in
leather–covered or copper–covered vise jaws
horizontally.
2. Carefully unscrew the Motor Housing Assembly (1)
from the Gear Case.
The rear Spindle Bearing (89), Gear Head
Bearing (90), and the Motor Clamp Washer (75)
will either stay with the Motor Housing Assembly
or the Gear Case Assembly.
3. Remove the Motor Clamp Washer and either Bearing
if they stay with the Gear Case Assembly.
For N, P, or Q Gear Ratios only
4. Remove the Gear Head (78).
The Planet Gear Assembly (79) holds the Rotor
Pinion (82) in place.
5. Remove the Planet Gear Shaft (81) that secures the
Planet Gear Assembly.
6. Remove the Rotor Pinion.
7. If required, remove the Planet Gear Bearing (80) from
the Planet Gear Assembly.
For all Ratios
8. Remove the Spindle Assembly.
9. Press the Planet Gear Shaft (87) from the splined end
of the Spindle Assembly.
Disassembly of Motor
1. Grasp the shaft of the Rotor (38) in leather–covered or
copper–covered vise jaws and pull the assembled
motor from the Motor Housing Assembly (1).
2. Remove the Front Rotor Bearing Retainer (51) and
the Front Rotor Bearing Support Assembly (50).
3. Holding the Cylinder (46), tap the splined end of the
Rotor with a light, plastic–faced hammer to remove
the Front Rotor Bearing (48), and Front End Plate
(47).
4. Remove the Cylinder and Vanes (39) from the Rotor.
5. Remove the Rear Bearing Support Gasket (41) and
the Rear Rotor Bearing Support (40).
6. Remove the Rotor Bearing Retaining Nut (43), the
Rear Rotor Bearing (42), the Rear End Plate
Gasket (44), and the Rear End Plate (45).
7. Examine all motor parts for wear or damage as
follows:
a. Vanes – Check for evidence of cracking, chipping
or spalling. Replace the complete set of Vanes if
any of these conditions exists.
b. Rotor Bearings – Check for looseness or
roughness.
Replace a Bearing if either condition is detected.
c. Cylinder –Examine the bore. If it is cracked,
wavy or rough, replace the Cylinder.
d. End Plates – Examine the rotor side for scoring.
Polish out shallow score marks using fine (320
grit) emery cloth placed on a hard, flat surface.
Replace End Plates having deep score marks.
e. Rotor – Polish the ends of the Rotor with fine
emery cloth to remove score marks. Check the
spline for excessive wear. Replace a Rotor with a
worn or broken spline.
Disassembly of the Throttle Mechanism
1. Clamp the Motor Housing Assembly (1) in
leather–covered or copper–covered vise jaws with the
Throttle Lever (29) upward.
2. Drive the Throttle Lever Retaining Pin (30) that
secures the Throttle Lever (29), from the Motor
Housing.
3. Remove the Throttle Valve Plunger Stop (12), the
Throttle Plunger Bushing Assembly (10), and the
Throttle Valve Plunger Assembly (8).
4. Rotate the Motor Housing to gain access to the Inlet
Bushing (28).
5. Remove the Inlet Bushing, Air Strainer (27), Throttle
Valve Spring (17), Throttle Valve Ball (16), Valve
Seat Face (14), Throttle Valve Seat Assembly (13),
and the Valve Seat Seal (15).
Disassembly of the Shutoff Valve
For Series 9T only
1. Remove the Regulator Body Cap (25).
2. Loosen the Lock Screw (22) and remove the
Regulator
Adjusting Screw (21).
3. Remove the Regulator Spring (19), and the Regulator
Ball (20).
4. Carefully remove the Regulator Body Assembly (18).
5. Remove the Shutoff Valve (2), the Shutoff Valve
Body (2A), the Shutoff Valve Spring (3), and the
Shutoff Valve Stop (3A).
Disassembly of the Reverse Valve
For Series 9RS only
The Detent Ball (35) is spring–loaded. Do not lose
the Detent Ball or the Detent Spring (36).
1. Carefully unscrew the Detent Adjusting Screw (37)
and remove the Detent Spring and the Detent Ball.
2. Remove the Reverse Valve Knob Pin (34) and the
Reverse Valve Knob (33).
3. Pull the Reverse Valve Assembly (31) from the
bushing in the Motor Housing Assembly (1).