Graco 311322H, Operation, Parts, Service And Repair

Page: 15 / 34

Repair
311322H 15
Mixing Chamber and Gun
Block
1. Follow Pressure Relief Procedure , page
12.
2. Remove flat tip assembly from end of mix
module.
3. Remove air cap.
4. Use a 5/16 in. nut driver to alternately
loosen side block mounting screws. Care-
fully separate side blocks from gun. Wipe
mating surfaces with a rag soaked in gun
cleaner.
5. Remove gun block bolts. Slide gun block
away from gun. Wipe mating surfaces with
a rag soaked in gun cleaner. Clean gun
block with gun cleaner and brass brushes
to remove residual chemical and built-up
material. This ensures unrestricted move-
ment of mixing chamber.
6. Use a 3/16 in. wrench or needle-nose pliers
to hold end of piston shaft while unscrewing
mixing chamber by hand. Clean mixing
chamber with gun cleaner and drill bits.
Inspect for damage and replace if neces-
sary.
7. Hold end of piston shaft with a 3/16 in.
wrench or needle-nose pliers. Screw mix-
ing chamber onto shaft by hand.
8. Slide gun block over mixing chamber and
up to gun. Install two mounting screws.
Tighten screws alternately and evenly to
prevent leakage.
9. Install side blocks to gun body with two
mounting screws. Tighten screws alter-
nately and evenly to prevent leakage.
10. Return gun to service. See Daily Start-Up ,
page 11.
If your gun has a round pattern spray tip,
skip step 2 and go to step 3.
To repair side blocks, see Side Blocks ,
page 13.