Ingersoll-Rand 2906P User Manual

Air Impact Wrench

2906P

Maintenance Information

Form 04584272

Edition 1

April 2005

Save These Instructions

Always wear eye protection when operating or

2 Form 04584272-Edition 1

performing maintenance on this tool.

Always turn off the air supply and disconnect the air
supply hose before installing, removing or adjusting any
accessory on this tool, or before performing any
maintenance on this tool.

LUBRICATION

Each time a Series 2906P Impactool is disassembled for
maintenance and repair or replacement of parts, lubricate
the tool as follows:

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 ” and
the bottom hammer “B ” with the arrows pointing
upward. 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.

1. Work approximately 6 to 8 cc of Ingersoll–Rand

No. 105 Grease into the impact mechanism. Coat the

Anvil (48 or 100) lightly with grease around the
Hammer Case Bushing (45). Inject approximately 1 to
2 cc of grease into the Grease Fitting (25).

2. Use Ingersoll–Rand No. 10 Oil 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 (4) 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.

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. Unscrew Reverse Valve Knob Screw (24) and remove
Reverse Valve Knob (23).

This Screw is installed with a thread locking
compound.

2. While slowly rotating Reverse Valve (20), withdraw it
from Reverse Valve Bushing (18).

Disassembly of the Impactool

1. Clamp handle of Impactool in a vise with square drive
pward.

2. Unscrew and remove the four Hammer Case Cap
Screws (47).

3. While lightly tapping on end of Anvil (48 or 100) with
a plastic hammer, lift off the Hammer Case
Assembly (44).

4. Grasp Hammer Frame (41) and carefully lift off entire
impact mechanism, making certain not to drop the two
Hammer Pins (42).

5. Lift Hammer Frame Washer (43) off Motor Housing
(1) and remove Impactool from vise.

Be careful not to lose the Reverse Valve Detent Ball
(21) and Spring (22) from the hole in the side of the
Reverse Valve.

3. Remove the two Reverse Valve Bushing Seals (19)
from Reverse Valve.

4. Press Reverse Valve Bushing from Housing Cover
(17).

Disassembly of the Motor

1. Remove the four Housing Cover Cap Screws (26 and

27) and separate the Housing Cover (17) and Housing
Cover Gasket (29) from Motor Housing (1).

2. Slide assembled motor out of Motor Housing.

3. If Motor Clamp Washers (39) remained in Housing,

Form 04584272-Edition 1 3

remove them. If Washers remained with motor, lift
them off Front End Plate (37).

4. Slide Front End Plate, Front Rotor Bearing (38) and
Cylinder (35) off Rotor (33) and remove Cylinder
Dowel (36) and Vanes (33).

5. Using snap ring pliers, remove Rear Rotor Bearing
Retainer (31) and slide Rear End Plate (34) and Rear
Rotor Bearing (30) off Rotor shaft.

6. If Front Rotor Bearing or Rear Rotor Bearing must be
replaced, use a drift to tap the Bearing out of End Plate.

Disassembly of the Throttle Mechanism

1. Unscrew and remove Oil Chamber Plug (4) and Oil
Chamber Plug Seal (5). Drain oil from oil reservoir.

2. Unscrew and remove Air Inlet (16).

3. Lift off Exhaust Deflector (15) and withdraw Exhaust
Silencer (l4).

4. Using snap ring pliers, remove Oiler Retaining Ring
(13) from inside handle.

5. Withdraw Oiler Body Assembly (10), Throttle Valve
Spring (9) and Throttle Valve (8) from handle.

6. Withdraw Trigger Assembly which consists of Trigger
Pin (2) and Trigger (3).

7. If Throttle Valve Seat (6) must be replaced, thread a
long 3/8” cap screw into it and pull it from handle.

Do not remove the Throttle Valve Seat unless you
have a new Seat on hand for installation. Be careful
not to lose the Throttle Valve Seat Support (7).

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 pressing the bearing into a bearing recess.

3. Whenever grasping a tool or part in a vise, always use
leather–covered or copper–covered vise jaws. Take
extra care with threaded parts and housings.

4. Always clean every part and wipe every part with a
thin film of oil before installation.

5. Apply a film of O–ring lubricant to all O–rings before
final assembly.

Assembly of the Throttle Mechanism

1. If Throttle Valve Seat (6) was removed, install and a
new Throttle Valve Seat by pushing Seat into place
with a 1/2” (13 mm) diameter dowel.

2. Wipe Trigger Pin (3) with some light grease, and insert
Trigger Assembly (2) into the trigger bushing.

3. Insert Throttle Valve (8), long stem end first, into
bottom of handle so that the valve stem engages hole in
Trigger Pin.

4. Install Throttle Valve Spring (9), small end first.

5. Make certain two Oiler Body Seals (12) are positioned
in annular grooves on the Oiler (10) and install Oiler,
counterbored end first, into handle. The large end of
the Throttle Valve Spring should seat in counterbore in
Oiler.

6. Install Oiler Retaining Ring (13) in groove in handle.

7. Grasp new (or solution cleaned) Exhaust Silencer (14)
by long edge. Fold it lengthwise and while squeezing
one end into a round configuration, insert it into the
handle flush with exhaust deflector recess.

8. Position Exhaust Deflector (15) on bottom of handle
and retain it with Air Inlet (16). Tighten Air Inlet to 30
to 35 ft–lb (40.5 to 47.5 Nm) torque.

Assembly of the Motor

1. Using a sleeve that will contact only the outer ring of

the bearing, press the Front Rotor Bearing (38) into
Front End Plate (37) and Rear Rotor Bearing (30) into
the Rear End Plate (34).

2. Slip Front End Plate and Bearing over splined hub of
Rotor (32).

3. Grasp splined hub of Rotor in leather–covered or
copper–covered vise jaws so that Rotor is in a vertical
position.

4. Dampen each Vane (33) with light oil and insert a Vane
into each vane slot.

5. Set Cylinder (35) over Rotor and onto Front End Plate.

6. Slide Rear End Plate and Bearing onto rotor hub and
against Cylinder.

7. Install Rear Rotor Bearing Retainer (31) in groove on
rotor hub.

8. Align dowel hole in both End Plates with one through
Cylinder, and insert a guide rod 5/32” diameter x 6”
long (3.9 mm diameter x 152 mm long). Allow rod to
protrude from Front End Plate.

9. Remove assembled motor from vise and grasp handle
of Motor Housing (1) in leather–covered or
copper–covered vise jaws so that bore of Motor
Housing is horizontal.

10. Place two Motor Clamp Washers (39), concave side
flat, against Front End Plate. Make certain small holes
in Washers fit onto guide rod and outer rim contacts
Front End Plate.

11. Insert protruding end of guide rod, Motor Clamp
Washers leading, into dowel hole in bore of Motor
Housing and slide motor along the rod until it is
completely seated.

12. Remove guide rod and replace it with Cylinder
Dowel (36).

13. Reposition Motor Housing in vise so that Rear End
Plate is upward.

14. Position Housing Cover Gasket (29) and Housing
Cover (17) against Motor Housing.

4 Form 04584272-Edition 1

15. Secure Housing Cover with Housing Cover Cap
Screws (26 and 27) and Lock Washers (28). Tighten
Screws to 50 to 60 in–lb (5.6 to 6.8 Nm) torque.

Install the two short Cap Screws (27) in the holes
farthest from the Air Inlet and the two long Cap
Screws (26) in the holes nearest the Air Inlet.

16. Remove tool from vise.

Assembly of the Reverse Valve

1. If Reverse Valve Bushing (18) was removed, align
notch in end of Bushing opposite the internal spline
with cast line on Housing Cover (17). The cast line is
approximately 180 from the number “5” on Oil
Chamber Plug (4) side of Housing Cover. Press the
Bushing into Cover until splined end is flush with
numbered face of Cover.

When properly installed, the notch and cast line will
be on opposite sides of the Housing Cover.

2. Make certain Reverse Valve Bushing Seals (19) are
properly located in undercuts in Reverse Valve
Bushing.

3. Dampen Reverse Valve (20) with light oil. Install
Reverse Valve Detent Spring (22) followed by Reverse
Valve Detent Ball (21) in hole in Reverse Valve. With
Impactool in an upright horizontal position and while
facing handle end of Impactool, slowly rotate Reverse
Valve and insert it from left to right in splined end of
Reverse Valve Bushing.

4. Apply a thread locking compound to Reverse Valve
Knob Screw (24). Attach Reverse Valve Knob (23) to
Reverse Valve with Reverse Valve Knob Screw, and
tighten Screw to 40 to 50 in–lb (4.5 to 5.6 Nm) torque.

Assembly of the Impact Mechanism

2. Replace Hammers in Hammer Frame (41) 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.

3. Replace Hammer Pins (42).

4. Examine base of Anvil (48 or 100) 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. Position Motor Housing in leather–covered or
copper–covered vise jaws with splined shaft of Rotor
(32) upward.

2. Place Hammer Frame Washer (43), small hub leading,
over hub of Rotor and against the Front Rotor Bearing
(38).

3. Place assembled impact mechanism down over splined
hub of Rotor.

4. Position Hammer Case Gasket (46) against face of
Motor Housing.

5. Smear a thin film of Ingersoll–Rand No. 105 Grease on

inside surface of Hammer Case Bushing (45), and
place Hammer Case (44) down over Anvil and against
Motor Housing.

6. Install Hammer Case Cap Screws (47) and tighten
them to 60 to 70 in–lb (6.8 to 7.9 Nm) torque.

TOP HAMMER
WIDE BEVEL UP

TOP HAMMER
HALF–ROUND NOTCH ON RIGHT

BOTTOM HAMMER
WIDE BEVEL DOWN

BOTTOM HAMMER
HALF–ROUND NOTCH ON
LEFT

(Dwg. TPD652)

1. Coat Hammers (40) with a light film of Ingersoll–Rand
Impactool Grease No. 100.

Form 04584272-Edition 1 5

TROUBLESHOOTING GUIDE

Trouble Probable Cause Solution

Low power Dirty Inlet Bushing or Air

Strainer Screen and/or Exhaust
Silencer

Worn or broken Vanes Replace complete set of Vanes.

Worn or broken Cylinder and/or
scored End Plates

Dirty motor parts Disassemble tool and clean all parts with a

Improper positioning of Reverse
Valve

Motor will not run Incorrect assembly of motor Disassemble motor and replace worn or broken

Insufficient lubricant in the
impact mechanism

Tool will not impact Broken or worn impact

mechanism parts

Impact mechanism not assembled
correctly

Using a suitable cleaning solution, in a well
ventilated area, clean Air Strainer Screen, Inlet
Bushing and Exhaust Silencer.

Examine Cylinder and replace it if it is worn or
broken or if bore is scored or wavy. Replace End
Plates if they are scored.

suitable cleaning solution, in a well–ventilated area.
Reassemble tool as instructed in this manual.

Make certain that Reverse Valve is fully
engaged to the left or right.

parts and reassemble as instructed.

Remove Hammer Case Assembly and lubricate
impact mechanism.

Remove Hammer Case and examine impact
mechanism parts. Replace any worn or broken
parts.

Refer to Assembly of the Impact Mechanism.

SAVE THESE INSTRUCTIONS. DO NOT DESTROY.

www.irtools.com

© 2005 Ingersoll-Rand Company