With the setscrew to the Cup Seal Valve in place you can see that the threads
holding the setscrew are missing on the sides. This is
because of the oval cut made to match the cut in the top of
the cup seal for the Sweep airflow.
You can install the longer LPR hose supplied with the gun
to gas up the marker while the ram is separated from the
gun body to check for the source of any leak.
To remove the Cup Seal Valve assemble, first check to make sure the guns is
not holding pressure, then remove the setscrew and, with needle-nose pliers, pull
the cup seal assembly out of the gun body. However the Cup Seal should only
be removed because you have a leak down the barrel.
The front edges of cup seal valves are prone to
damage. Alien’s valve body has raised edges to
protect the seat if the valve body is dropped or
hit against another surface.
Look for a foreign substance on the body or the
cup seal cap. This can be caused from dirty air in
a compressor. Next, make sure the O-Rings do
not have any nicks. Then check the raised ridge
on the Cup Seal with your fingernail. If you can feel a bump or catch, that is
where it is leaking. A small nick can cause a leak and once it is nicked it is likely
that you will have to replace the Valve body.
Oil the O-Rings before replacing the Cup Seal
assembly and put the pin on the spring before
sliding the cup seal back into the body. Don’t force
the Cup Seal as the O-Rings can be cut when
replacing the valve in the body.
MAKE SURE the open end faces inside the body!
The cap sits against the ridge. If your gun no
longer shoots, but still cycles, turn the cup seal around!
As previously mentioned, there is little reason to take the LPR body out of the
body. In the event of a leak down the
barrel, removing the ram and taking the
cup seal out the back is usually the best
way to service. To remove the LPR detach
the Inline Regulator. One screw holds the
LPR body to gun body.
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