Graco 24G979 用户手册

4. Remove valve seat and o-ring from valve housing 

and remove gun needle.

5. Remove seal nut and o-ring.

6. Clean all parts. Inspect o-rings for signs of wear, 

replace as necessary.

7. Lubricate o-ring with one drop of oil. Install o-ring. 

8. Install seat nut, o-ring, and gun needle. 

9. Install o-ring on valve seat and insert into valve 

housing.

10. Install retaining nut. 

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.

Check the piston o-rings carefully. Lubricate all parts 
with a light waterproof grease and reassemble the valve 
using new parts as necessary. 

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