Replacing Air Valve - DeVilbiss GFG PRO Technical Bulletin

Replacing Air Valve

Reasons to replace air valve:
A) Air leak through the gun.
B) Air valve not operating correctly.
1. Remove trigger using SPN-8 or TORX (T20) key
provided in the kit. (See figs 13 & 14)
2. Unscrew air valve using SN-28 (14 mm) Spanner. (See
fig 15)
3. Remove air valve by gripping the stem. (See fig 16)
4. Remove spring with spring pad. (See fig 17)
5. Hook out rear seal using Service Tool (56). (See figs 18
& 19)
6. Clean air valve bores in gun body with the brush
supplied in the kit.
7. Place new rear seal onto Service tool (56); grooves
must fit in service tool form. (See fig 20)
8. Push rear seal firmly into hole up to shoulder, using
Service tool. (See figs 21 & 22)
9. Insert new spring, ensuring the end with the plastic
bearing pad goes in first. (See fig 17)
10. Insert air valve assembly into gun and carefully feed
over the spring and through the rear seal. (See fig 23)
11. Tighten air valve assembly using fingers first, and then
tighten with SN-28 (14 mm) Spanner. (See figs 24 &
15)
12. Replace trigger. (See figs 14 & 13)
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