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14. Place a Motor Clamp Washer (34), concave side first,
down over the hub of the Front End Plate so that the
outer rim of the Washer contacts the Front End Plate.
Place the second Motor Clamp Washer, convex side
first, down over the hub of the Front End Plate so that
the inner rims of both Washers are in contact but the
outer rims are separated.
15. Place the Motor Retainer (35), small bore first, down
over the hub of the Front End Plate and against the
outer rim of the second Motor Clamp Washer.
Assembly of the Reverse Valve
1. After applying o–ring lubricant to the Reverse Valve
Seals (18), install them in the undercuts in the reverse
valve bushing. Make certain they are properly seated.
2. Dampen the Reverse Valve (17) with light oil. For
models with optional Power Regulator Part No.
2920–K329 only, install the Detent Spring (22)
followed by the Reverse Valve Detent Ball (21) in the
hole in the Reverse Valve. With the Impactool in an
upright horizontal position, and while facing the
handle end of the Impactool, insert the Reverse Valve
from left to right into the reverse valve bushing.
3. For models with optional Power Regulator Part
No. 2920–K329 only, position the Reverse Valve with
the indicator slot on the end of the Valve pointing to
the number 5 on the Housing. Position the Reverse
Valve Knob (19) on the opposite end of the Valve with
the small notch pointing, as near as possible, to the
number 5 on that side of the Housing. Apply a thread
locking compound to the Reverse Valve Knob Screw
(20) and fasten the Knob to the Valve with the Screw.
Tighten the Knob Screw to 5 to 6 ft–lb (6.75 to
8.15 Nm) torque.
Assembly of the Impact Mechanism
TOP HAMMER
WIDE BEVEL UP
TOP HAMMER
HALF–ROUND NOTCH ON RIGHT
BOTTOM HAMMER
HALF–ROUND NOTCH ON LEFT
1. Coat the Hammers (44) with a light film of
Ingersoll–Rand No. 100 Grease.
MAINTENANCE SECTION
BOTTOM HAMMER
WIDE BEVEL DOWN
(Dwg. TPD652)
2.
Replace the Hammers in the Hammer Frame (42)
exactly as they were when you marked them prior to
disassembly.
If you are installing new Hammers, or want to
change the location of the existing Hammers to
utilize both impacting surfaces, slide the Hammers
in the Hammer Frame so that the half–round notch
on one Hammer is located on one side of the Frame
and the half–round notch on the other Hammer is
located on the other side of the Frame. These
Hammers must be installed with the wide bevels
facing the web of the Hammer Frame as
illustrated.
3.
Replace the Hammer Pins (43).
4.
Examine the base of the Anvil and note its contour.
While looking down through the Hammer Frame,
swing the top Hammer to its full extreme one way or
another until you can match the contour of the Anvil.
Enter the Anvil into the Hammer Frame and through
the first Hammer. Swing the bottom Hammer in the
opposite direction from the top Hammer and
maneuver the Anvil slightly until it drops into the
bottom Hammer.
Model 2920B
Assembly of the Square Drive Anvil and Spline
Drive Anvil
1.
Place the Rear Hammer Frame Washer (41) or (44),
hub side first, over the hub of the Rotor and against
the Front Rotor Bearing.
2.
Set the assembled impact mechanism down over the
splined hub of the Rotor. If the impact mechanism
was disassembled, refer to Assembly of the Impact
Mechanism.
3.
Position the new Hammer Case Gasket (36) or (39) on
the Housing.
4.
Work approximately 12 to 15 cc of Ingersoll–Rand
No. 100 Grease into the impact mechanism.
5.
Smear a thin film of Ingersoll–Rand No. 100 Grease
on the inside surface of the Hammer Case Bushing
(38) or (41) and place the Hammer Case (37) or (40)
down over the Anvil (45 or 53) or (48 or 56) and
against the Motor Retainer.
6.
Install the Hammer Case Cap Screws (39) or (42) and
Cap Screw Lock Washers (40) or (43) and tighten
them to 20 to 25 ft–lb (27 to 34 Nm) torque.
7.
Remove the Impactool from the vise and inject 2 to
4 cc of the recommended grease into the Grease
Fitting (10) or (18).
21
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