Table of Contents
Advertisement
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.
Disassembly of the Motor
1.
Grasp the Motor Retainer (35) and remove it from the
Motor Housing (1).
MAINTENANCE SECTION
2.
3.
4.
5.
6.
7.
8.
9.
Disassembly of the Throttle Mechanism
1.
2.
3.
Model 2920B9
Dissasembly of the Angle Attachment
1.
2.
19
Remove the Rear Hammer Frame Washer (41) and
the Motor Clamp Washers (34) from the front of the
Motor.
The End Plate Dowel (30) will fall free when the
Front End Plate (29) clears the Housing. Do not
lose the Dowel.
Grasping the splined end of the Rotor (31), carefully
lift the assembled motor from the Motor Housing.
Remove the Rear End Plate Gasket (26).
Remove the Motor Housing from the vise.
Slide the Front End Plate (29) with the Front Rotor
Bearing (32) from the Rotor.
Remove the Cylinder Dowel (33), Cylinder (27) and
Vanes (28) from the Rotor.
Using snap ring pliers, remove the Rear Rotor
Bearing Retainer (23) and slide the Rear End Plate
(25) with the Rear Rotor Bearing (24) from the Rotor.
If the Front or Rear Rotor Bearing requires
replacement, press it from the End Plate.
Unscrew the Air Inlet Bushing (9) and remove the Air
Strainer Screen (8), Throttle Valve Spring (7),
Throttle Valve Assembly (5) and Throttle Valve
Plunger(4).
If the Throttle Valve Seat (6) needs replacement,
insert a hooked tool through the center of the Valve
Seat. Catch the backside of the Seat with the hook
and pull the Seat from the Housing.
Unscrew the four Exhaust Deflector Screws (15) and
remove the Exhaust Deflector (13) Exhaust Deflector
Gasket (14) and the Exhaust Silencer/Exhaust Baffle
(12, 11) combination.
Slide the Connector Retaining Sleeve (116) toward
the square drive anvil and pull the Angle Housing
Assembly (102) off the tool.
Be careful not to lose the three Connector
Retaining Balls (119) as they are free to fall out
when the Connector Retaining Sleeve is removed.
Grasp the Angle Housing Assembly in
leather–covered or copper–covered vise jaws, bevel
pinion end facing upward. Slide the Connector
Retaining Sleeve (116) toward the square drive anvil
and remove the Connector Retaining Sleeve Stop
(118) from the Angle Housing Connector (114).
Advertisement
Table of Contents
