Maintenance
18
313267W
5.
Remove one of the side block seal housings from
the side block. Leave the seal in the housing and
rinse it with suitable solvent.
6.
Place the side seal housing in the gun head so the
face of the seal sits against the mix chamber.
7.
Turn on the system air and activate the gun.
NOTE:
The purge air does not shut off with the side
block removed.
8.
If the impingement port is not fully visible through
the side seal housing, turn the system air off and
activate 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 cen-
ter or slightly forward), the piston lock adjustment
nut is properly aligned.
NOTE:
Non-permanent thread locker can be applied to
the adjustment nut if necessary.
10. Reassemble the gun.
Verify the Piston Lock Assembly
is Working
Before each use, verify that the piston lock assembly is
installed and working properly.
1.
Engage the piston lock (G).
2.
Pressurize the system to working pressure.
3.
Open the material valves (E,F).
4.
Point the gun in a safe direction and trigger the gun.
No material should flow from the gun tip.
NOTE:
Do not use the gun if it is not working properly.
Refer to information included in this
Maintenance
sec-
tion to troubleshoot problems. For additional information
or technical assistance, contact Graco Ohio Technical
Assistance at 800-746-1334 or Ohio [email protected].
NOTICE
If the material valves are on when the side blocks are
removed, the gun quickly becomes encased in ure-
thane.