Service
312372E 7
Service
Preparation
1. Flush and clean gun before servicing.
2. Follow Pressure Relief Procedure, see
page 4.
Air Cap, Nozzle, and Needle
1. Unscrew air cap (1).
2. Trigger gun while you remove the nozzle
(2) with gun tool (27).
3. Remove fluid adjustment knob (8-2) and
spring (9).
4. Pull needle (10) out of the back of the gun.
Air Valve and Needle Packings
1. Remove retaining rings (15), pin (16), and
trigger (17).
2. Remove packing nut (4) and fluid needle
packings (3-1 and 3-2).
3. Remove fluid needle guide (7).
4. Remove fluid adjusting guide (8-1).
5. Remove spring (18) and air valve (19).
6. Remove air valve seat (20) and o-ring.
7. Replace parts as needed.
8. Assemble gun in reverse order. Lubricate
needle and o-rings. Be sure to trigger gun
when installing nozzle (2).
Fluid leaking from
packing nut (4).
a. Packing nut (4) loose. a. Tighten, but not so tight as to grip needle.
b. Packing (3-1 or 3-2) worn
or dry.
b. Lubricate or replace.
Fluid nozzle (2)
dripping.
a. Dry packing (3-1 or 3-2). a. Lubricate.
b. Sluggish needle (10). b. Clean and lubricate.
c. Packing nut (4) too tight. c. Loosen.
d. Worn fluid nozzle or
needle.
d. Replace.
Thin, coarse
finish.
a. Gun held too far from
surface.
a. Hold gun about 6-8 inches (150-200 mm)
from surface.
b. Atomization air pressure
set too high.
b. Reduce air pressure.
Thick, dimpled
finish (resembling
orange peel).
Gun held too close to
surface.
Hold gun about 6-8 inches (150-200 mm)
from surface.
Problem Cause Solution
Trigger gun and use gun tool (27) when-
ever you tighten or remove the nozzle (2)
to avoid damage.
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