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10. Insert the protruding end of the guide rod into the cast slot at
the bottom of the Motor Housing bore and slide the assembled
motor along the rod until it is completely seated in the housing.
11. Remove the guide rod and install the Cylinder Dowel (33).
12. Install the End Plate Dowel (30).
13. Grasp the handle of the Motor Housing in leather-covered
or copper-covered vise jaws with the open end of the Motor
Housing upward.
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
Bottom Hammer
Half-Round Notch on left
(Dwg. TPD652)
1. Coat the Hammers (44) with a light film of Ingersoll Rand No.
170 Grease.
4
Top Hammer
wide Bevel up
Top hammer Half-Round
Notch on right
Bottom hammer
wide Bevel down
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. 170 Grease
into the impact mechanism.
5. Smear a thin film of Ingersoll Rand No. 170 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).
Assembly of the Quick–Change 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. 170 Grease
into the impact mechanism.
5. Smear a thin film of Ingersoll Rand No. 170 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 and against the
Motor Retainer.
6. Reinstall the rear Thrust Ring Lock (49) or (52) on the Quick
Change Anvil (47) or (50).
7. Place a dab of grease into the hole in the Quick Change Anvil to
temporarily hold the Retaining Ball (52) or (55).
8. Slide the Retaining Sleeve (48) or (51), Retaining Sleeve Spring
(51) or (54), Thrust Ring (50) or (53), and front Thrust Ring Lock
(49) or (52) onto the Anvil.
NOTICE
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