Check Valves - Graco 309550Y Instructions - Parts Manual

Check Valves

Before disassembling, press on ball (26c) to test
check valve for proper movement and spring
action.
1.
Follow Pressure Relief Procedure, page 15.
2.
Remove fluid manifold (M). Leave air connected.
Clean Fluid Manifold, page 20.
M
3.
Flush gun to remove residual A and B compo-
nents, page 20. Follow Pressure Relief Proce-
dure, page 15.
4.
Disconnect air.
CAUTION
To prevent cross-contamination of the check valves,
do not interchange A component and B component
parts. The A component check valve is marked with
an A.
309550Y
5.
Pry out check valves (26) at notch.
WARNING
Read warnings, page 7. Damaged check valve o-rings
(26f, 26g) may result in external leakage. Replace
o-rings if any damage is seen.
6.
Slide filter (26d) off. Clean and inspect parts. Thor-
oughly inspect o-rings (26f, 26g). If necessary,
remove screw (26b) and disassemble entire check
valve.
TI2543A
7.
Reassemble check valves. Screw (26b) should be
flush (within 1/16 in. or 1.5 mm) of housing (26a)
surface. Liberally lubricate o-rings (26f, 26g) and
carefully reinstall in fluid housing.
8.
Attach fluid manifold. Connect air. Return gun to
service.
TI2540A
B
A
26b
26e
26c
26d
26
26g
26a
26f
Repair
TI2429A
31