Graco 309550Y important safety instructions 18 B

Repair

8. Pull mix chamber (19) out rear of fluid housing.

Inspect for damage and clean ports, page 21. Inspect o-ring (23) in front of fluid housing.

CAUTION

To prevent cross-contamination of the gun’s wetted parts, mix chamber is marked with an A and a notch

(N)on back edge. Be sure the A side of mix chamber is on the A side of gun.

9.Apply thin coat of lubricant to mix chamber (19).

Install mix chamber. Etched A and notch (N) must be on same side as A on fluid housing. Mix cham- ber is keyed to fit in fluid housing.

11. Liberally lubricate and reinstall side seal car-

tridges (18).

24

18B

18

A

TI2426A

12. Lubricate all threads and reinstall retaining ring

(9). Install air cap (10).

9

B

19

10

A TI2428A

N

CAUTION

To prevent cross-contamination of side seal car- tridges, do not interchange A component and B com- ponent parts. The A component cartridge is marked with an A.

10. Carefully inspect side seal cartridge o-rings and

surfaces. Replace worn or damaged parts. Lib- erally lubricate o-rings (18d, 18e) and reassem- ble. Press on side seal (18c) to check proper spring (18b) operation.

18e

TI2427A

18c

18b

18d

TI2424A

13. Attach Front End, page 28.

14. Connect air, and trigger the gun a few times to

check for leaks. If either check valve pops out of its seated position, there is a poor fluid seal on that side of the mix chamber or side seal/car- tridge components. Correct the problem before attaching the fluid manifold.

15. Attach fluid manifold. Connect air. Return gun to

service.

30 309550Y