Parts Replacement/Maintenance; Servicing Air Valve - DeVilbiss HD Series Technical Bulletin

Parts Replacement/Maintenance

AIR VALVE INSTRUCTIONS

Servicing Air Valve

Reasons to service air valve:
A) Air valve not functioning correctly (may need
cleaning).
B) Routine maintenance.
C) Air leaks (advise replacement, see p10)
1. Remove trigger using the tool supplied (SPN-8) or TORX
T20 key. (See fig 1 & 2)
2. Unscrew air valve using SN-28 (14 mm) spanner. (See
fig 3)
3. Remove air valve by gripping stem. (See fig 4)
4. Remove spring with spring pad. (See fig 5)
5. DO NOT REMOVE REAR SEAL (35) FROM GUN
BODY. (See fig 6)
6. DO NOT REMOVE PLASTIC CAGE FROM AIR VALVE
BODY AS THIS MAY DAMAGE THE CAGE. (See fig 7)
7. CLEAN
a. Remove all paint build up. (See fig 8)
b. The 4 poppet holes must be clear. (See fig 9)
c. Stem must be free to float in poppet. (See fig 10)
d. Stem must slide through cage bore with slight
resistance (due to seal).
e. Rear seal must look clean and in position in the
bore. (See fig 6)
f. If any of the above cannot be rectified, replace the
air valve (See Replacing Air Valve p10).
8. Replace spring ensuring the end with the plastic bearing
pad goes in first. (See fig 5)
9. Insert air valve assembly into gun and carefully feed
over the spring and through the rear seal. (See fig 11)
10. Tighten air valve assembly using fingers first, and then
tighten with SN-28 (14mm) Spanner. (See figs 12 & 3)
11. Replace trigger. (See figs 2 & 1)
12. If there is an air leak through the gun, the air valve may
need replacing (See Replacing Air Valve).
013 Finishing Brands UK Ltd.
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