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Product Safety Information
•
Failure to observe the following warnings, and to avoid these potentially hazardous situations, could result in death or serious injury.
•
Read and understand this and all other supplied manuals before installing, operating, repairing, maintaining, changing accessories on, or
working near this product.
•
Always wear eye protection when operating or performing maintenance on this tool. The grade of protection required should be assessed
for each use and may include impact-resistant glasses with side shields, goggles, or a full face shield over those glasses.
•
Always turn off the air supply, bleed the air pressure and disconnect the air supply hose when not in use, before installing, removing or
adjusting any accessory on this tool, or before performing any maintenance on this tool or any accessory.
Note: When reading the instructions, refer to exploded diagrams in Parts Information Manuals when applicable (see under Related Documentation
for form numbers).
Lubrication
Each time a Model 2920B and 2920B9 Impactool is disassembled for
maintenance and repair or replacement of parts, lubricate the tool as follows:
1. Work 12 to 15 cc of Ingersoll Rand No. 170 Grease into the
impact mechanism. Coat the Anvil (45, 47, 48, 50, 53 or 56) lightly
with grease around the Hammer Case Bushing (38 or 41). Inject 2
to 4 cc of grease into the Grease Fitting (10 or 18).
Disassembly
General Instructions
1.
Do not disassemble the tool any further than necessary to replace
or repair damaged parts.
2.
Whenever grasping a tool or part in a vise, always use leather-
covered or copper-covered vise jaws to protect the surface of
the part and help prevent distortion. This is particularly true of
threaded members and housings.
3.
Do not remove any part which is press fit in or on a subassembly
unless the removal of that part is necessary for repairs or replacement.
4.
Do not disassemble the tool unless you have a complete set of
new gaskets and O-rings for replacement.
Model 2920B
Disassembly of the Square Drive Anvil and Spline Drive
Anvil
1. Clamp the handle of the Impactool in leather-covered or copper-
covered vise jaws with the square drive Anvil upward.
2. Unscrew and remove the four Hammer Case Cap Screws (39).
3. While lightly tapping on the end of the Anvil (45 or 53) with a
plastic hammer. Lift off the Hammer Case (37).
4. Remove and discard the Hammer Case Gasket (36).
5. Grasp the Hammer Frame (42) and carefully lift off the entire
impact mechanism, making certain not to drop the two Hammer
Pins (43). If it is necessary to disassemble the impact mechanism,
refer to Disassembly of the Impact Mechanism. If it is unnecessary
to disassemble the impact mechanism, set it aside intact.
Disassembly of the Quick–Change Anvil
1. Clamp the handle of the Impactool in leather-covered or copper-
covered vise jaws with the Quick-Change Anvil upward.
2. Remove the front Thrust Ring Lock (49) and Thrust Ring (50).
The Retaining Ball (52) is held in the hole in the Anvil (47) by
the Retaining Sleeve. Once the Retaining Sleeve is removed,
the Retaining Ball will fall free.
3. Remove the Retaining Sleeve Spring (51), Retaining Sleeve,
Retaining Ball, and the rear Thrust Ring Lock (49).
4. While lightly tapping on the end of the Anvil with a plastic
hammer, lift off the Hammer Case (37) and remove the Hammer
Case Gasket (36).
5. Grasp the Hammer Frame (42) and carefully lift off the entire
impact mechanism, making certain not to drop the two Hammer
Pins (43). If it is necessary to disassemble the impact mechanism,
refer to Disassembly of the Impact Mechanism. If it is unnecessary
to disassemble the impact mechanism, set it aside intact.
2
NOTICE
WARNING
2. Use Ingersoll Rand Oil No. 50 for lubricating the motor. Inject
1 to 2 cc of oil into the air inlet before attaching the air hose.
Remove the Oil Chamber Plug (16 or 10) and fill the oil chamber.
Disassembly of the Impact Mechanism
1. Set the mechanism, driver end up, on the workbench.
Note the twin Hammers (44) within the Hammer Frame (42).
These are identical but must be placed in the Hammer Frame
in a certain relationship. Using a felt–tipped pen, mark the
top Hammer "T ↑ " and the bottom Hammer "B ↑ " with the
arrows pointing upward. Mark both Hammers on the same
end.
2. With the mechanism sitting upright on the workbench, slowly
rotate the Anvil (45 or 47) in a clockwise direction until it comes
up solid.
If you continue to rotate the Anvil, it will cam the Hammers
out of engagement. Do not allow this to happen; merely
rotate the Anvil until it comes up solid.
3. Hold the Hammer Frame firmly and, without disturbing the
Hammers, gently lift the Anvil, simultaneously rotating it
counterclockwise about 1/8 of a turn, from the Hammer Frame.
The twin Hammers will be free to slide from the Hammer
Frame when the Hammer Pins (43) are removed. Do not drop
the Hammers.
4. With the Anvil removed, lift out the two Hammer Pins.
5. Remove the Hammers.
Disassembly of the Reverse Valve
The Reverse Valve Knob Screw (20) is installed with a thread
locking compound. You may have to heat the Screw slightly
to loosen it.
1. Unscrew the Reverse Valve Knob Screw and remove the Reverse
Valve Knob (19).
For models with optional Power Regulator
Part No. 2920–K329 only, be careful not to lose the Reverse
Valve Detent Ball (21) and Reverse Valve Detent Ball Spring
(22) from the hole in the side of the Reverse Valve (17).
2. While slowly rotating the Reverse Valve, withdraw it from the
reverse valve bushing in the Motor Housing.
NOTICE
NOTICE
NOTICE
NOTICE
NOTICE
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