Graco Python A25011, Instructions - Parts Manual

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Repair
3A4386E 31
Inlet Check Valve Repair (models
PCI-xxx-xxH only)
1. Follow the Pressure Relief Procedure, page 17.
2. Remove the inlet check valve assembly (17).
3. Separate the front housing (17d) from the back
housing (17e).
4. Remove the piston (17b) and the piston o-ring (17c).
5. Inspect parts for wear, replace as needed.
6. Install the piston o-ring (17c) and piston (17b) in the
back housing (17e).
7. Reattach the front housing (17d) to the back hous-
ing (17e).
8. Reconnect the inlet check valve assembly (17).
Outlet Check Valve Repair (all models
except PCI-xxx-xxH)
1. Follow the Pressure Relief Procedure, page 17.
2. Remove the outlet check valve assembly (18).
3. Remove the retaining nut (18a), spring (18b), and
piston (18c).
4. Remove the piston o-ring (18d).
5. Inspect parts for wear, replace as needed.
6. Install the piston o-ring (18d), piston (18c),
spring (18b), and retaining nut (18a).
7. Reconnect the outlet check valve assembly (18).
F
IG
. 18 Inlet check valve assembly
17d
17b
17c
17e
17
F
IG
. 19 Outlet check valve assembly
18
18d
18c
18b
18a