Repair
Centerline Component Removal
Refer to Figure 2 to view centerline com- 
ponents.
1.Perform Pressure Relief Procedure (page 13) and Clean Spray Gun Procedure, page 18.
2.Remove air cap by hand, turning it counter- clockwise.
3.Remove screen screw assembly. Flush and place in gun cleaner.
4.Remove check valves. Flush and place in gun cleaner.
5.Flush screen screw and check valve ports.
6.Remove spring retainer case by firmly grasping knob of case. Push in and rotate counterclockwise to remove from air cylin- der. Pull spring out of air cylinder.
7.Loosen felt wiper retainer
8.Remove valving rod. Push back firmly on piston rod until end of valving rod stop bar emerges from cylinder.
9.Remove gun block from frame.
10.Unscrew felt wiper assembly from rear of mixing chamber. Keep rear of mixing cham- ber in upright position to prevent possible loss of internal chamber parts. Ensure brass retaining sleeve is not stuck to felt wiper. Place wiper assembly in gun cleaner.
11.Remove mixing chamber. Hold gun block in one hand with chamber tip pointing into your palm. Insert mixing chamber knockout
tool into rear of gun block and tap with hammer until chamber ejects. Place cham- ber in gun cleaner.
Mixing Chamber
Chamber
Knockout
Tool
FIG. 22: Mixing Chamber Removal
CAUTION
Matching tapers on mixing chamber and center hole in gun block are machined to an exact fit to hold chambers in place and cre- ate a
12.Remove closure screw in top of gun block. Place screw in gun cleaner and clean entire gun using appropriate cleanout tools and brass brushes. Then flush thoroughly with gun cleaner.
13.Disassemble check valve assemblies.
Screw
Sleeve
Ball and Spring
FIG. 23: Check Valves
22 | 311320H |