HP GRACO OR PRO TI1681A - Manual (Page 49)

Repair
309293J 49
Fan Air Adjustment Valve Repair
1. Prepare the gun for service, page 41.
2. Place a wrench on the flats of the valve assembly
(20) and unscrew it from the handle (17).
You may replace the valve as an assembly (go to step 9)
or as individual parts (steps 3-9).
3. Remove the retaining ring (20a). See F IG . 31..
4. Turn the valve stem (20d) counterclockwise until it
comes free from the valve housing (20c).
5. Remove the o-ring (20b).
6. Clean all parts and inspect for wear or damage.
Use non-silicone grease, Part No. 111265. Do not
over-lubricate.
7. When reassembling the fan air valve (20), lightly
lubricate the valve threads and screw the stem (20d)
fully into the housing (20c) until bottomed. Install the
o-ring (20b*), lubricate, and unscrew the valve stem
until the o-ring enters the housing.
8. Reassemble the retaining ring (20a). Unscrew the
valve stem from the housing until it is stopped by the
retaining ring.
9. Screw the valve assembly (20) into the gun handle,
using a wrench on the flats of the housing. Torque to
15-25 in-lb (1.7-2.8 N•m).
Fig. 31. Fan Air Adjustment Valve
TI1487A
20a
20b*
20c
20d