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Service
Fan Air Adjustment Valve Repair
1. Prepare the gun for service as instructed on page
22.
2. Place a wrench on the flats of the valve housing
and remove it from the handle. See Fig. 20.
NOTE: The fan air valve (43) can be replaced as an
assembly or as individual parts.
To disassemble the fan air valve:
1. Rotate the adjustment knob (43c) counterclock-
wise, backing out until it stops. Remove the retain-
ing ring (43h) and back off the KV HI-LO lever
(43g) from the valve housing (43d). See Fig. 20.
2. Using a standard wrench, remove the valve hous-
ing (43d) from the gun.
3. Remove the retaining ring (43b).
4. Rotate the adjustment knob (43c) counterclock-
wise until it is disengaged from the valve housing
threads (43d). Pull the fan valve from the housing.
The KV HI-LO lever (43g) and the wave spring
(43f) can be removed if necessary.
5. Clean all the parts and inspect them for wear or
damage.
6. When reassembling the fan air valve (43), lubricate
the o-rings (43e) and the threads on the adjust-
ment knob (43c) with petroleum jelly. Reassemble
the retaining ring.
7. Apply low strength (purple) Loctite or equivalent
thread sealant to the threads of the valve housing
(43d). Start the valve housing threads into the
handle by turning the adjustment knob (43c). Once
the threads are started, rotate the knob (43c) fully
counterclockwise. Torque the valve housing (43d)
to 10–12 in-lb (1.1–1.4 NSm).
8. Reposition the KV HI-LO lever (43g) back onto the
valve housing (43d) in correct orientation. Reinstall
the retaining ring (43h) into the groove on the
valve housing.
0385A
0386A
Fig. 20
DETAIL
43
43b
43d
43c
43h
43e
43g
43f
Lubricate o-rings (43e) and top knob threads
(43c) with petroleum jelly
Apply low strength (purple) Loctite or equiva-
lent to housing (43d) threads; Torque to
10–12 in-lb (1.1–1.4 N.m)