Graco Python A25177 Instructions Manual page 30

Repair
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).
17
F . 18 Inlet check valve assembly
IG
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).
30
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).
18b
18a
17d
F . 19 Outlet check valve assembly
IG
3. Remove the retaining nut (18a), spring (18b), and
17b
piston (18c).
17c
4. Remove the piston o-ring (18d).
5. Inspect parts for wear, replace as needed.
17e
6. Install the piston o-ring (18d), piston (18c),
spring (18b), and retaining nut (18a).
7. Reconnect the outlet check valve assembly (18).
18
18d
18c
3A4386C