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-11-
T
O 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 willrelease 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.
TO REPLACE WEAR PLATE OR BLADE GUIDE:
1. Separate 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 screw driver, 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.
MAINTAINING THE MIII SERIES TOOLS
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