12
MAINTENANCE SECTION
Assembly of the Trigger Mechanism
1. Install the three Valve Bushing Seals (10, 11 and 18)
in the grooves on the Throttle Valve Bushing (9).
2. Install the Throttle Valve Seal (8) in the groove on the
Throttle Valve (7).
3. Insert the Throttle Valve, threaded end leading, into
the end of the Throttle Valve Bushing. Start the Valve
into the end of the Bushing farthest from the radial
holes.
4. Thread the Speed Regulator (12) onto the threaded
shaft of the Throttle Valve.
5. Thread the Trigger (14) onto the threaded shaft of the
Throttle Valve until the Trigger Setscrew (15) stops
against the end of the valve shaft.
6. Encircle the small hub of the Throttle Valve with the
Throttle Valve Spring (6) and insert the assembly,
Spring first, into the throttle hole in the Motor
Housing (1).
7. Slide the Trigger Shield (16) onto the shaft of the
Throttle Valve between the Bushing and the Speed
Regulator. Position the Shield on the hub of the
Bushing and against the Housing and secure it by
installing the two Trigger Shield Screws (17).
8. Thread the Speed Regulator to the desired position
and tighten the Regulator Setscrew (13) with a hex
wrench.
Assembly of the Motor
Before reassembly, check the Rotor, Cylinder and faces
of the End Plates for scoring. Minor scoring can be
smoothed over with a fine emery cloth. Make certain
all parts are clean and free of dirt and grit. Work a
little Ingersoll–Rand No. 28 Grease into the gear train,
Rear Rotor Bearing and Front Rotor Bearing. Coat the
Vanes, Rotor, End Plates and Cylinder bore with a light
coat of the Ingersoll–Rand No. 10 Oil.
1. Press the Rear Rotor Bearing (20) into the Rear End
Plate (21).
2. Place the Rear End Plate, Bearing trailing, onto the
shaft of the Rotor (24) without the spline. Install the
Rear Rotor Bearing Retainer (19) in the groove on the
rotor hub to retain the Bearing and End Plate.
3. Place a Vane (25) in each slot of the Rotor.
4. Slide the Cylinder (23) over the splined end of the
Rotor until the cylinder alignment groove engages the
End Plate Dowel (22) in the Rear End Plate.
5. Install the Front End Plate (26) onto the splined hub
of the Rotor until it contacts the Cylinder. Make
certain the cylinder alignment groove engages the
End Plate Dowel (27) in the Front End Plate (26).
6. With the Rotor standing on the hub with the Rear
Rotor Bearing, press the Front Rotor Bearing onto the
splined rotor hub and into the Front End Plate.
7. Slide the assembled motor into the Motor Housing
(1). Using a soft hammer, lightly tap the splined end
of the Rotor to seat the Motor into the Motor Housing.
8. Install the Ring Gear (38) in the Motor Housing.
Assembly of the Shear Head and Gearing
1. If the Spindle Planet Gears (32) are being replaced,
proceed as follows:
a. Stand the Spindle Planet Gear upright on a smooth
surface and insert one of the retaining washers into
the Gear.
b. Grind or cut one of the old Planet Gear Shafts (33)
to equal the length of the Gear.
c. Stand the old, shortened Shaft upright in the center
of the Gear and place the eleven rollers inside the
Gear around the Shaft.
d. Place the second retaining washer on top of the
rollers encircling the Shaft.
e. Without loosing the washers, position the
assembly inside the Spindle (31).
f. Use a new, longer Planet Gear Shaft to push out
the shortened Shaft and capture the assembly
inside the frame of the Spindle.
g. Repeat the procedure for the other Planet Gear.
2. Press the Rear Spindle Bearing (29) onto the short
hub of the Spindle.
3. Install the Grease Shield Retainer (34) in the groove
on the shaft of the Spindle.
4. Install the Front Spindle Bearing Spacer (37), Front
Spindle Bearing (36) and Grease Shield (35) in the
Gear Case Housing (39).
5. Insert the threaded end of the assembled Spindle
through the Bearing and Gear Gear Case Housing.
6. Place the Washer (41) on the Spindle against the Gear
Case and thread the Eccentric Driver (42) onto the
threaded shaft of the Spindle.
7. Grasp the Eccentric Driver of the assembled Spindle
and insert the assembly into the Ring Gear and Motor
Housing. Make certain the Spindle engages the spline
of the Rotor and the Planet Gears engage the Ring
Gear without binding.
8. When the components mesh without binding, thread
the Gear Case onto the Motor Housing and tighten it
securely.
9. Position the assembled Shear Attachment (40) on the
hub of the Gear Case. Make certain the hex on the
Driver is properly positioned to engage the Center
Blade (44).
10. When the Shear Attachment is properly positioned,
tighten the three Cap Screws (46) that hold the
Housing in position.
