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Piston Lock Adjustment and Installation
Procedure
The P2 gun piston throw is factory set and as a rule, should
not require adjustment. The piston throw refers to how far
back the air piston will travel when the gun is triggered.
Proper throw adjustment will align the mixing chamber side
ports with the side block seal thru port. There is a set screw
that determines how far the piston will travel before it stops.
To determine if the throw is correct:
1.
Follow the pressure relief procedure on page 16 and
disconnect material hoses from the gun.
2.
Turn the material ball valves to the OFF position.
Verify that the piston lock cap has been tightened and
3.
fully threaded into the gun.
Remove the side blocks.
4.
Section 3 - General Information: Maintenance
r_gcp3ra_313266_1_6e
Remove one of the side block seal housings, from side
5.
block. Leave the seal (34) in housing and rinse with
suitable solvent.
6.
Place the side seal housing in the gun head so the face
of the seal sets against the mix chamber.
WARNING
If the material valves are on when side blocks are
removed, the gun will quickly become encased in ure-
thane!
7.
Turn the gun trigger air supply on, then trigger the gun.
The purge air will not shut off with the side block
removed.
8.
If the impingement port is not fully visible through the
side seal housing turn the trigger-air off and trigger the
gun to relieve pressure. Use a 9/16 in. open-end
wrench to adjust the adjustment nut in the appropriate
direction. Repeat steps 7 and 8 until it is
adjusted properly.
9.
If the impingement port on the mix chamber is fully
visible through the side seal housing (either on
center or slightly forward), the piston lock adjustment
nut is properly aligned.
Non-permanent thread locker can be applied to the
adjustment nut if necessary.
10.
Reassemble the gun.
Before each use: Verify that the piston lock assembly is
installed and working properly.
•
Engage piston lock.
•
Pressurize the system to working pressure.
•
Open material ball valves.
•
Point the gun in a safe direction and trigger gun. No
material should flow from gun tip.
•
DO NOT USE IF IT IS NOT WORKING PROPERLY.
20
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