Graco 311320H important safety instructions Centerline Component Removal, Mixing Chamber Removal

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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 2-3 turns. DO NOT REMOVE.

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 leak-proof seal. When handling or cleaning these parts be careful not to dam- age finish. Do not use metal tools to clean these parts.

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

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311320H

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Contents Important Safety Instructions Model D Spray GunContents ModelsPersonal Protective Equipment Fire and Explosion Hazard Overall View Major ComponentsCenterline Components Centerline ComponentsIsocyanate Hazard Operation BasicsGrounding Keep a and B Components SeparateManual Valves Remove Coupling BlockValving Rod Adjustment Screw Air Hose ConnectionClean Felt Wiper Air Cap Adjustment ValveAdjust Felt Wiper Felt WiperInitial Set Up Valving Rod Closed PositionDaily Start-Up Daily ShutdownPressure Relief Procedure Spray Pattern Adjustment Point of ValvingTern opens as adjustment is made FIG Turns Out From Point Recommended Valving Rod Adjustment for Standard Mixing ChambersDistance of Gun Chamber Minimum Maximum From Surface Maintenance Gun Service KitsClean Spray Gun Procedure Filter Screen Removal and Service RepairClean Injection Slots Check ValvesValving Rod Adjustment Not RemoveCenterline Component Removal Mixing Chamber RemovalSleeve Removal Block Centerline Component Installation Chamber SeatingRepair Model D Spray Gun Assembly PartsModel D Spray Gun Assembly No. Part No. DescriptionAC chamber Standard Mixing Chambers Air Cylinder Assembly Part NumberCoupling Block Assembly Model311320H Technical Data Category DataGraco Standard Warranty Graco Information