screw driver or
Allen wrench 0.050
Roll pin punch
3/16 drill bit or rod
Wood dowel ½”
1. Remove roll pin front
sight-barrel band assembly,
2. Remove pump arm linkage and
3. Remove rear sight assembly
4. Remove 0.050 allen screw, breech
& barrel assembly, exhaust port tube & seal
The exhaust port tube has a top and a
bottom note the tapered side and flat side
5. Remove front pistol grip screw
6. Remove rear pistol grip screw
& pistol grip assembly, rear tube plug & hammer spring.
When removing pistol grip from
the pump tube there will be a small spring and check ball, this is what
holds the safety in the on or off position , be careful not to loose they
are very very small.
You can leave spring and ball
check in the pistol grip if you are replacing only the piston and valve.
7. Consist of the hammer & hammer
cocking pin. The hammer must be slid to the rear of the slot to the hole
then the pin may be removed by pulling straight up and the hammer will slide
out of the tube.
8. Use the wood dowel to push
the stock valve out of the tube from the back of the tube
(rear sight end) to the front (front sight end)
Make note of the exhaust port and
threaded hole (top & bottom) the new valve must line-up with the tube when
you reinstall the valve in the tube. Exhaust port on top threaded hole on
9. Clean all burrs from inside
of tube with fine sand paper wrapped around the wood dowel (fine sand
Paper) clean all grit from the tube.
10. Install the new valve, note
the exhaust port and threaded hole, Exhaust port on top threaded hole on the
bottom flat side to the front valve pin to the rear
Push the valve in with wood
dowel line up the holes on top and bottom.
11. Assemble gun in reverse of
tear down except piston, linkage and pump handle.
This is where the 3/16 drill or
rod will come to use
Remove the O-Ring
Oil the pistons oil ring/wiper
Loosen (3) Knurled Lock Ring
and shorten the piston as short as it will go use only your fingers.
Remove stock piston from the
pump linkage and measure up the stock piston and the flattop piston get as
close as possible to the same length.
DO NOT install O-Ring yet
Attach Flat top piston to the
pump linkage with the piston pin then slide piston into guns pump tube
install barrel band front sight assembly using the drill bit slide through
tube, barrel band and linkage to temporally hold the gun together, gently
close pump lever until you feel the pump touch the piston. There should be
only about 3/4s of an inch, or 19 to 20 millimeters gap between the pump
handle and pump tube this will allow the piston to squeeze out maximum air
pressure and then to cam over to hold the pump lever closed on the tube.
After you get this correct go to 6
remove piston from tube snug
lock ring test one more time by following step 5
Reassemble gun and button it
up with roll pin.