Magnum Venus Plastech ATG Gel Coat Gun - Manual (Page 17)

ATG Chopper Gun Manual
Rev. 05/2012 Page | 17
Gun Head Repair:
1. Remove the Catalyst spool valve assembly; note it consists of two (3) pieces.
2. Unscrew the Valve Back from the Catalyst Piston, using caution not to lose
the lock nut.
3. Replace the o-rings on the Valve Back and Catalyst Piston.
Note: A special tool is available to install the o-rings on the catalyst spool
valve – Catalyst Valve O-ring Tool ATC-40204-1.
4. Install the Lock Washer on the Valve Back.
5. Thread the Valve Back into the Catalyst Piston.
Note: Use a drop of removable thread lock compound on threads of the Valve
Front and Valve Back during reassembly.
6. Unscrew the Valve Front for the Valve Back – Note this is a reverse thread.
Note: The threads on the Valve Front are reverse threads and will unscrew
clockwise from the Valve Back.
7. Install new O-Rings on the Valve Front and O-Ring between the Valve Front
and Valve Back
8. Thread the Valve Front into the Valve Back – Note this is a reverse thread.
Set Catalyst Spool aside for now.
9. Install a new o-ring onto the catalyst cylinder on the gun head.
10. Remove the two set screws on the side of the gun head assembly holding the
catalyst cylinder in place.
11. Remove catalyst cylinder from the gun head.
Note: Make note of the o-ring positions on the catalyst cylinder. Installing the
new o-rings in the wrong positions will cause the gun to not work properly.
12. Replace the old o-ring with the new o-rings from the seal kit.
13. Lubricate the o-rings with SSL-10 or Vaseline.