Graco 238338 Operation Manual page 7

4. Remove valve seat and o-ring from valve housing
and remove gun needle.
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5. Remove seal nut and o-ring.
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6. Clean all parts. Inspect o-rings for signs of wear,
replace as necessary.
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7. Lubricate o-ring with one drop of oil. Install o-ring.
8. Install seat nut, o-ring, and gun needle.
ti16189a
308612K
ti16183a
ti16197a
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9. Install o-ring on valve seat and insert into valve
housing.
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10. Install retaining nut.
Air Piston, Spring and Seals
1. Perform Pressure Relief Procedure, page 4.
2. Remove valve housing (step 2, page 6).
3. Pull out piston and spring guide, then clean and
inspect all parts.
Double Acting
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Check the piston o-rings carefully. Lubricate all parts
with a light waterproof grease and reassemble the valve
using new parts as necessary.
Service
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Single Acting
ti17002a
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