Graco 309550Y Instructions - Parts Manual page 30

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.
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
18c
18b
18d
30
19
B
A
TI2428A
N
TI2427A
11.
Liberally lubricate and reinstall side seal car-
tridges (18).
18 B
12.
Lubricate all threads and reinstall retaining ring
(9). Install air cap (10).
9
10
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.
24
18
A
TI2426A
TI2424A
309550Y