Ingersoll-Rand 2908P Setup guide

Form 04584256
Edition 1
October 2004
Air Impact Wrench
2908P Series
Maintenance Information
Save These Instructions

2 Form 04584256-Edition 1
WARNING
Always wear eye protection when operating or performing maintenance on this tool. Always turn off the air supply and disconnect the air supply
hose before installing, removing accessory on this tool, or before performing any maintenance on this tool.
Lubrication
Each time a Series 2908P Air Impact Wrench is disassembled for
maintenance and repair or replacement of parts. lubricate as follows:
1. Work approximately 6 to 8 cc of Ingersoll-Rand Grease No. 105 into
the impact mechanism. Coat Anvil (46) lightly with grease around the
Hammer Case Bushing (41). Inject approximately 1 to 2 cc of grease
into the Grease Fitting (23).
2. Use Ingersoll-Rand Medium Oil No. 10 for lubricating the motor.
Inject approximately 1 to 2 cc of oil into the air inlet before attaching
the air hose. Remove the Oil Chamber Plug (15) and fill the oil
chamber.
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 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 Impact Wrench
1. Clamp handle of Air Impact Wrench in a vise with square driver
upward.
2. Unscrew and remove the four Hammer Case Cap Screws(45).
3. While lightly tapping on end Anvil (46) with a plastic hammer, lift off
the Hammer Case (40).
4. Grasp Hammer Frame (36) and carefully lift off entire impact
mechanism, making certain not to drop the two Hammer Pins (37). If
it is necessary to disassemble the impact mechanism, refer to
Disassembly of the Impact Mechanism on this Page. If it is
unnecessary to disassemble the impact mechanism, set it aside
intact.
Disassembly of the Impact Mechanism
1. Set mechanism, driver end up, on a workbench.
NOTICE
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 “Ty” and
the bottom Hammer “By” with the arrows pointing upward. Mark
both Hammers on the same end.
2. With mechanism sitting upright on the workbench, slowly rotate the
Anvil in a clockwise direction until it comes up solid.
NOTICE
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 clockwise about 1/8 of a
turn, from Hammer Frame.
NOTICE
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 the Anvil removed, lift out the two Hammer Pins.
5. Remove the Hammers.
Disassembly of the Motor
1. Lift Rear Hammer Frame Washer (38) and two Motor Clamp
Washers (35) from front of motor.
2. Grasp splined end of Rotor (28) and pull assembled motor from
Motor Housing (1).
NOTICE
Be careful not to lose the small End Plate Dowel (32)
3. Lift Front End Plate (33) and Front Rotor Bearing (34) from splined
end of the Rotor (28).
4. Remove Cylinder and Vanes (29).
5. Remove Rear Rotor Bearing Retainer (25).
6. Lift Rear End Plate and Rear Rotor Bearing (26) from Rotor.
7. Remove Oiler Retaining Ring (12A).
8. Unscrew and remove Air Strainer (13).
9. Withdraw Exhaust Deflector (6), Oiler Assembly (10), Throttle Valve
Spring (9) and Throttle Valve (8).
10. Withdraw Trigger Assembly (3).
11. If the Throttle Valve Seat (7) must be replaced, thread a long 3/8‘‘
cap screw into it and withdraw it from the handle.
NOTICE
Do not remove the Throttle Valve Seat unless you have a new
Throttle Valve Seat on hand for installation.
12. Unscrew Reverse Valve Knob Screw (22) and remove Reverse Valve
Knob (21).
NOTICE
This Screw is installed with Loctite ®*
13. While slowly rotating Reverse Valve (18), withdraw it from Reverse
Valve Bushing (16).
NOTICE
Be careful you do not lose the Reverse Valve Detent Ball (19) and
Spring (20) from the hole in the side of the Reverse Valve.
Assembly
General Instructions
1. Always press on the inner ring of a ball–type bearing when installing
the bearing on a shaft.
2. Always press on the outer ring of a ball–type bearing when installing
the bearing in a bearing recess.
3. 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.
* Registered trademark of Loctite Corporation.
4. Always clean every part and wipe every part with a thin film of oil
before installation.
5. Apply O-ring lubricant to every O-ring before assembly.
6. Check every bearing for roughness. If an open bearing must be
cleaned, wash it thoroughly in clean solvent and dry it with a clean
cloth. Sealed or shielded bearings should never be cleaned.
Work grease thoroughly into every open bearing before installation.

Form 04584256-Edition 1 3
Assembly of the Motor
1. Make certain Reverse Valve Bushing Seals (17) are properly located
in undercuts in Reverse Valve Bushing (16).
2. Dampen Reverse Valve (18) with light oil. Install Reverse Valve
Detent Spring (20) followed by Reverse Valve Detent Ball (19) in hole
in Reverse Valve. With Air Impact Wrench in an upright horizontal
position, and while facing handle end of Air Impact Wrench, slowly
rotate Reverse Value and insert it from left to right in splined end of
Reverse Valve Bushing.
3. Attach Reverse Valve Knob (21) to Reverse Valve with Reverse
Valve Knob Screw (22), and tighten Screw to 60 to 70 in-lb (6.75 to
8.15 Nm) torque.
4. If Throttle Value Seat (7) was removed from handle, install a new
Throttle Value Seat by pushing it into place with a 1/2’’ (13 mm)
diameter dowel.
5. Insert Trigger Assembly (3) into Trigger Bushing(2).
6. Insert Throttle Valve (8). long stem end first, into the bottom of handle
so that the valve stem engages the hole in the Trigger Pin (4).
7. Install Throttle Valve Spring (9), small end first.
8. Make certain two Oiler Body Seals (11) are positioned in annular
grooves on Oiler Body (10), and install Oiler Body counterbored end
first into handle. The large end of Throttle Valve Spring should seat in
the counterbore in Oiler Body. Install the Oiler Retaining Ring (12A).
9. Position Exhaust Deflector (6) on bottom of handle, and retain it with
Air Strainer (13). Tighten Air Strainer to 40 to 45 ft-lb (61 to 67.8 Nm)
torque.
10. Using a sleeve that will contact only the outer ring of the bearing,
press the Front Rotor Bearing (34) into Front End Plate (33) and
Rear Rotor Bearing (26) into Rear End Plate (27).
11. Slip Front End Plate and Bearing over splinded hub of the Rotor (28).
12. Grasp splined hub of Rotor in copper-covered vise jaws so that Rotor
is in a vertical position.
13. Dampen each Vane (29) with light oil and insert a Vane into each
vane slot.
14. Set Cylinder (30) over Rotor and onto Front End Plate.
15. Slide Rear End Plate and Bearing onto rotor hub and against
Cylinder.
16. Install Rear Rotor Bearing Retainer (25) in groove on rotor hub.
17. Align dowel hole in both End Plates with the one through the
Cylinder, and insert a guide rod 3/16’’ (4.7 mm) diameter x 6’’ (152
mm) long. Allow rod to protrude from Rear End Plate.
18. Grasp handle of Motor Housing in copper-covered vise jaws so that
bore of the Motor Housing is horizontal.
19. Wipe a thin film of light grease on End Plate Gasket (24) and press
Gasket firmly against Rear End Plate.
20. Insert protruding end of guide rod into dowel hole in bore of Motor
Housing, and slide motor along rod until it is completely seated.
21. Remove guide rod and replace it with the Cylinder Dowel (31). Install
End Plate Dowel (32) in the matching notches of Front End Plate and
Motor Housing.
22. Re-position Motor Housing in the vise so that the open face of the
Motor Housing is upward.
23. Place two Motor Clamp Washers (35), convex side first against Front
End Plate so that the inner rim of leading Washer contacts the End
Plate, and outer rim of trailing Washer contacts Hammer Case Pilot
(43).
24. Place Rear Hammer Frame Washer (38) over hub of Rotor and
against Front Rotor Bearing.
Assembly of the Impact Mechanism
(Dwg. TPD652)
1. Coat the Hammers with a light film of Ingersoll-Rand Grease No.
105.
2. Replace Hammers in the Hammer Frame exactly as they were when
you marked them prior to disassembly.
NOTICE
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 them Hammer Pins.
4. Examine base of Anvil and note its contour. While looking down
through the Hammer Frame, swing top Hammer to its full extreme
one way or another until you can match the contour of the Anvil.
Enter Anvil into Hammer Frame and through the first Hammer. Swing
bottom Hammer in opposite direction from top Hammer and
maneuver the Anvil slightly until it drops into the bottom Hammer.
Assembly of the Air Impact Wrench
1. Set assembled impact mechanism down over splined hub of Rotor.
2. Smear a thin film of Ingersoll-Rand Grease No. 105 on inside
surface of the Hammer Case Bushing (41), and place Hammer Case
(40) down over the Anvil (46) and against Motor Housing.
3. Install Hammer Case Cap Screws (45) and Lock Washers (44).
Tighten Hammer Case Cap Screws to 14 to 17 ft-lb (19 to 23 Nm)
torque.
BOTTOM HAMMER
HALF-ROUND NOTCH ON
LEFT
BOTTOM HAMMER
WIDE BEVEL DOWN
TOP HAMMER
HALF-ROUND NOTCH ON RIGHT
TOP HAMMER
WIDE BEVEL UP

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© 2004 Ingersoll-Rand Company
Troubleshooting Guide
Related Documentation
For additional information refer to:
Air Impact Wrench Product Safety Information Manual Form 04580916,
Air Impact Wrench Product Information Manual Form 04584785,
Air Impact Wrench Parts List Manual Form 04584389.
Manuals can be downloaded from www.irtools.com.
Troubleshooting Guide
Trouble Probable Cause Solution
Loss of Power Dirty Inlet Bushing or Air Strainer
Screen and/or Exhaust Silencer.
Using a clean, suitable, cleaning solution in a well
ventilated area, clean Air Strainer Screen, Inlet Bushing
Exhaust Silencer.
Worn or broken Vanes. Replace the complete set of Vanes.
Worn or broken Cylinder and/or scored
End Plates.
Examine Cylinder and replace it if it is worn or broken or if
the bore is scored or wavy. Replace the End Plates if they
are scored.
Dirty motor parts. Disassemble the tool and clean all parts with a suitable
cleaning solution, in a well ventilated area. Reassemble
the tool as instructed in this manual.
Improper positioning of the Reverse
Valve.
Make certain that the Reverse Valve is fully engaged to
the left or right.
Motor will not run Incorrect assembly of the motor. Disassemble the motor and replace worn or broken parts
and reassemble as instructed.
Insufficient lubricant in the impact
mechanism.
Remove the Hammer Case Assembly and lubricate the
impact mechanism.
Tool will not impact Broken or worn impact mechanism
parts.
Remove the Hammer Case and examine the impact
mechanism parts. Replace any worn or broken parts.
Impact Mechanism not assembled
correctly.
Refer to Assembly of the Impact Mechanism.