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-11-
TO REPLACE PISTON:
a. Insert the flats on the lower end of the driver piston stem carefully into the end of piston and
plunger wrench, BC1009.
b. Using another special wrench, BC1009, or another wrench of the proper size, unscrew the
plunger from the upper end of the stem. After this is done, it will be possible to lift the poppet
off the stem.
c. Place the special wrench, BC1009, down over the piston stem onto the driver piston, locking
the piston ears in the slots in the wrench. Unscrew the piston from the stem.
TO REPLACE DRIVER:
a. It is not necessary to disassemble the piston-poppet-driver assembly to replace the driver. Pull
the poppet up on the driver piston stem as far as it will go.
b. Insert special wrench, BC1009, over the driver piston, locking the piston ears in the slots in the
wrench. Unscrew the piston from threaded portion of the stem.
c. To remove the driver blade from the piston stem, push the driver blade pin out of the stem. This
will release the blade.
d. Insert new driver blade into the slot in the end of the driver piston stem and assemble the
driver blade pin. Test the side play in the driver blade by grasping the driver piston stem in one
hand and the blade in the other and moving the blade sideways in alignment with the slot in
the stem. There should be a small amount of side play in the blade. This is necessary to take
care of any slight misalignment between the blade and guide in the nose. If there is no side
play, the blade should be removed and the top (pin end) just barely dressed off with a stone.
It is not necessary to do more than smooth off the top to get the necessary side play. Do not
grind. Reinsert the blade and pin in the stem and test for side play once more. Repeat as
necessary to get this small amount of side play. Carefully examine the large threaded portion of
the piston stem. A nylon lock can be seen imbedded in a recessed hole in the stem. It is very
important that this nylon lock can be replaced when its locking efficiency has been reduced
through several disassemblies of the piston. It is necessary to use the sharp point of a knife,
or some such instrument, to remove this nylon lock. Insert a new one by setting it into the
recessed hole in the stem, and tapping it gently until firmly seated. Reverse these instructions
to reassemble.
e. Assemble plunger flush with end of piston stem.
TO REPLACE PILOTED VALVE SEALS:
1. Remove exhaust deflectors and four hex socket head cap screws holding cap to cylinder.
Remove cap, exposing the poppet piston and piloted valve.
2. Remove gasket, piloted valve seat, piloted valve, spring and O-rings.
3. Clean all O-ring grooves. Lubricate new O-rings, and assemble.
4. After new O-rings have been assembled to piloted valve, insert spring into valve body. Lay tool
on its side and slide valve into position. Turn tool upright and replace gasket.
5. After new O-ring has been assembled to valve seat, slide it through the gasket and over the
piloted valve.
6. Insert new O-ring in stepped hole in cap directly over piloted valve. Assemble cap using four
socket head cap screws and replace exhaust deflectors.
MIIIFS
TO REPLACE WEAR PLATE OR BLADE GUIDE:
1. Seperate the magazine from the nose by removing four socket head cap screws.
2. Remove and replace Wear Plate or Blade Guide.
TO REPLACE DETENT SPRING, OR PUSHER SPRING:
1. Remove Magazine.
2. Set the magazine down on a flat surface. Cup palm over the hooked end of the cover to prevent
the detent pin and the detent pin spring from popping out and being lost when cover is removed.
Turn the magazine upside down and reach in with a small screwdriver, or needle nose pliers, and
lift the pusher spring off the pusher. Slide cover out the BACK end of the magazine.
3. To remove the springs from the magazine, use a 3/32” (2.4mm) pin punch and drive the spring
anchor pin out of the magazine body. Replace and reverse the instructions to reassemble.
MIIIFN
TO REPLACE WEAR PLATE OR DRIVER GUIDE:
1. Remove the three socket head cap screws holding the wear plate and driver guide
to the magazine assembly.
2. Pull the pusher assembly back to disengage from the wear plate.
3. Remove and replace the wear plate and driver guide.
TO REPLACE the PUSHER SPRING assembly:
1. Remove the three socket head cap screws holding the wear plate and driver guide
to the magazine assembly.
2. Remove the four socket head cap screws holding the magazine assembly halves together.
3. Remove two of the flat head cap screws holding the plastic spacer to the bottom of the
magazine assembly.
Note: remove both screws from the same magazine half.
4. Remove the socket head cap screws holding the pusher handle to the pusher assembly .
5. Remove the shoulder screw holding the pusher drum to the magazine.
6. Replace the pusher assembly.
MAINTAINING THE MIII SERIES TOOLS
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