Model GX-8 Spray Gun
22
32943-1, Issue 1
3.
REMOVE THE GUN FROM THE COUPLING BLOCK- Using the 5/16" Spintite;
remove the Coupling Block Mounting Screw. Separate the gun from the Coupling
Block. Using a rag soaked with Gun Cleaner wipe clean the face of the Coupling
Block to prevent material build-up.
4.
PRESSURIZE THE AIR
CYLINDER- After making sure that
the Safety Stop is engaged, connect
the air line from the gun to the air
source.
5.
LOOSEN REAR PACKING NUT-
Using the 5/16” Open-End Wrench,
back out the Packing Nut three or
four turns. This will eliminate the
contact pressure between the Seal,
located inside the Packing Nut, and
the Valving Rod. With the pressure
relieved, the Valving Rod will move
freely making the adjustment
procedure easier to perform.
Figure 13. Valving Rod Adjustments
6.
LOOSEN THE JAM NUT- Using the 3/8” Wrench, on the hex shaped Valving Rod
Shank and the ½” Wrench on the Jam Nut loosen the Jam Nut by turning it
clockwise. (As viewed from the front of the gun.) Continue to back the Jam Nut
away from the Valving Rod Shank by three or four full turns. Now move the
Valving Rod towards the Gun Cylinder by turning the Valving Rod Shank 2 or 3 full
turns clockwise.
7.
ADJUST VALVING ROD CLEARANCE- Slowly turn the Valving Rod counter
clockwise, moving it forward towards the Spray Tip until resistance is felt. Go no
further. The Valving Rod Tip contacting the inside spherical surface of the PCD
causes this resistance.
8.
LOCK ADJUSTMENT IN PLACE- While carefully maintaining the position of the
3/8” Wrench; tighten the Jam Nut up against the Valving Rod Shank.
9.
RETIGHTEN THE PACKING NUT- Using the 3/8” x 5/16” Open End Wrench,
retighten the Packing Nut.
10. CHECK THE REAR SAFETY STOP- Disengage the Safety Stop by pushing in and
turning the knob counter clockwise. If the knob will not turn, the Valving Rod is
adjusted too far forward. Repeat step 6 and 7 making sure not to adjust the Valving
Rod past the point where resistance is felt. Once the Safety Stop moves freely,
proceed to step 11.
11. CONFIRM REAR SEAL ADJUSTMENT- With the Safety Stop disengaged trigger
the gun. Make sure the Valving Rod moves freely. If it does not, loosen the Packing
Nut slightly until it does. Once spraying has started, make sure there is no chemical
weeping from the Packing Nut. If there is, retighten it slightly.