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1. Coat Hammers (37) with a light film of Ingersoll-Rand Impactool Grease No. 170.
2. Replace Hammers in Hammer Frame (35) exactly as they were.
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.
3. Replace Hammer Pins (36).
4. Examine base of Anvil (38) and note its contour. While looking down through 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 opposite direction from the top Hammer and maneuver Anvil slightly until it drops into bottom Hammer.
Assembly of the Impactool
1. Set assembled hammer mechanism onto Rotor shaft spline.
2. Place Hammer Case Gasket (34) over mechanism and against face of Motor Housing.
3. Grease Anvil and top of Hammer Frame.
4. Place Hammer Case (39) over mechanism assembly against Gasket.
5. Assemble Auxiliary Handle (43) to Aux. Handle Strap (42). Insert two Cap Screws (54). Position assembly against Hammer Case and thread
the Hammer Case Cap Screw (41) into Housing.
For 3956 Series: Thread remaining two Cap Screws into Housing and using an alternating pattern for all four fasteners, tighten Screws
between 35 and 40 ft-lb (47 and 54 Nm) torque.
6. Install a new Exhaust Silencer (33) in Motor Housing Assembly (26) and install the Exhaust Deflector (32).
Troubleshooting Guide
Trouble
Dirty Inlet Bushing or Air Strainer Screen
and/or Exhaust Silencer.
Worn or broken Vanes.
Worn or broken Cylinder and/or scored
Low power
End Plates.
Dirty motor parts.
Improper positioning of the Reverse Valve.
Incorrect assembly of the motor.
Motor will not run
Insufficient lubricant in the impact
mechanism.
Broken or worn impact mechanism parts.
Tool will not impact
Impact Mechanism not assembled
correctly.
Related Documentation
Manuals can be downloaded from ingersollrand.com
For additional information, refer to:
Product Safety Information Manual 04580916
Product Information Manual TL-3956-PIM
Parts Information Manual TL-3956-PLM
TL-3956-MIM_ed1
Probable Cause
NOTICE
Solution
Using a clean, suitable, cleaning solution, in a well ventilated area,
clean Air Strainer Screen, Inlet Bushing and Exhaust Silencer.
Replace complete set of Vanes.
Examine Cylinder and replace it if it is worn or broken or if the bore is
scored or wavy. Replace End Plates if they are scored.
Disassemble tool and clean all parts with a suitable cleaning solution,
in a well ventilated area. Reassemble tool as instructed in this manual.
Make certain that the Reverse Valve is fully engaged to the left or right.
Disassemble the motor, replace worn or broken parts and reassemble
as instructed.
Remove Hammer Case Assembly and lubricate impact mechanism.
Remove Hammer Case and examine the impact mechanism parts.
Replace any worn or broken parts.
Refer to Assembly of the Impact Mechanism.
EN
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