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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 Series 3956 Impactool is disassembled for maintenance and repair or replacement of parts, lubricate the tool as follows:
1. Work approximately 12 to 15 cc of Ingersoll-Rand No. 170 Grease into the impact mechanism. Coat the Anvil (38) lightly with Grease. Also,
coat the inside of the Hammer Case Bushing (40) with Grease. Inject approximately 2 to 4 cc of Grease into the Grease Fitting (2).
2. Use Ingersoll-Rand No. 10 Oil for lubricating the motor. Inject approximately 1 to 2 cc of oil into the Straight Inlet (10) before attaching the
air hose.
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 a part in a vise, always use leathercovered 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 a 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.
Disassembly of the Air Impactool
1. Grasp tool in copper-covered or leather-covered vise jaws with square drive upward.
2. Squeeze sides of the Exhaust Deflector (32) and remove from Motor Housing Assembly (26). Remove the Exhaust Silencer (33).
3. Using a hex wrench, unscrew and remove the four Hammer Case Cap Screws (41) and remove Strap, Aux Handle (42).
4. While lightly tapping on the end of Anvil (38) with a plastic hammer, lift off Hammer Case (39).
5. Remove the Hammer Case Gasket (34).
6. Remove Anvil by rotating it as it is lifted out of the assembly.
7. Lift remaining Hammer assembly off Rotor shaft.
8. Push two Hammer Pins (36) out of the Hammer Frame Assembly (35) and slide two Hammers (37) out of the Frame.
Disassembly of the Impact Mechanism
1. Set mechanism, driver end up, on a workbench.
Note the twin Hammers within the Hammer Frame. 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
Mark both Hammers on the same end.
2. With mechanism sitting upright on a workbench, slowly rotate Anvil 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 Hammer Frame firmly and, without disturbing Hammers, gently lift Anvil, simultaneously rotating it clockwise 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 are removed. Do not drop the Hammers.
4. With Anvil removed, lift out the two Hammer Pins.
5. Remove the Hammers.
Disassembly of the Reverse Valve
1. Lightly clamp Motor Housing Assembly (26) in leather-covered or copper-covered vise jaws with Handle Assembly (1) upward.
Excessive clamping pressure will distort the Motor Housing and make motor removal extremely difficult. Do not insert the Hammer
case end of the Motor Housing more than 1" (25 mm) into the vise jaws.
2
WARNING
NOTICE
" and the bottom Hammer "B
NOTICE
NOTICE
NOTICE
" with the arrows pointing upward.
TL-3956-MIM_ed1
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