4
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Troubleshooting
Spray Pattern
Problems
Remedies
Fluttering
1. Air enters between fluid nozzle and tapered seat of spray gun body.
2. Air is drawn from fluid needle packing set.
3. Air enters at fluid container fitting nut or fluid hose joint.
1. Remove fluid nozzle to clean seat. If it is damaged, replace nozzle.
2. Tighten fluid needle packing.
3. Fully tighten joint section.
Crescent
1. Paint buildup on air cap assy. partially clogs horn holes.
Air pressure from both horns differs.
1. Remove obstructions from horn holes with attached brush.
But do not use metal objects to clean horn holes.
Inclined
1. Paint buildup or damage on fluid nozzle circumference and air cap assy.
center.
2. Fluid nozzle is not properly fitted.
1. Remove obstructions.
Replace if damaged.
2. Remove fluid nozzle and clean seat section.
Split
1. Paint viscosity too low.
2. Fluid output too high.
3. Pattern air pressure is too high.
1. Add paint to increase viscosity.
2. Turn fluid adj. knob clockwise to reduce fluid output.
3. Turn pattern adj. assy. clockwise to reduce pattern air pressure.
Heavy Center
1. Paint viscosity is too high.
2. Fluid output is too low.
1. Add thinner to reduce viscosity.
2. Turn fluid adj. knob counter-clockwise to increase fluid output.
Spit
1. Fluid nozzle and fluid needle are not seated properly.
2. The first-stage travel of trigger (when only air discharges) decreases.
3. Paint buildup inside air cap assy.
1. Clean or replace fluid nozzle and fluid needle assy..
2. Replace fluid nozzle and fluid needle assy.
3. Clean air cap assy.
R1: retighten R2: adjust R3: clean R4: replace parts
Problem
Where it
occurred
Parts to be checked
Cause
Remedy
R1
R2
R3
R4
Paint leaks
Fluid nozzle
Fluid nozzle ~ Fluid needle
Dirt, damage, wear on seat
〇
〇
Loose fluid needle adj. knob
〇
Wear on needle spring
〇
Fluid nozzle ~ Spray gun body
Insufficient tightening
〇
Dirt or damage on seat
〇
〇
Needle packing set
Fluid needle does not return due to packing set too tight
〇
〇
Fluid needle does not return due to paint buildup on fluid needle
〇
〇
Needle packing set
Needle packing set
~ Fluid needle
Wear
〇
〇
Needle packing set
Insufficient tightening
〇
Paint does not
come out
Tip of spray gun
Fluid adj. knob
Insufficient opening
〇
Tip hole of fluid nozzle
Clogged
〇
Needle packing set
~ Fluid needle
Clogged
〇
〇
Insufficient tightening
〇
Air leaks
(from tip of air cap
assy)
Air valve &
Air valve seat assy
Air valve
Dirt or damage on seat
〇
〇
Air valve seat assy
Dirt or damage on seat
〇
〇
Wear on air valve spring
〇
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How to operate
・
To achieve the recommended 10 PSI air pressure inside the air cap, first fully open the pattern adjustment.
Then while pulling the trigger, set the air pressure at the gun inlet to that shown in the previous specifications table.
・
Recommended paint viscosity differs according to paint property and painting conditions.
18 to 25 sec. / Ford cup#4 is recommendable.
・
Keep fluid output as small as possible to the extent that the job will not be hindered.
It will lead to better finishing with fine atomization.
・
Set the spray distance from the spray gun to the work piece as near as possible within the range of 100~250 mm (3.9~9.8 in).
・
The spray gun should be held so that it is perpendicular to the surface of the work piece at all times.
Then, the spray gun should move in a straight and horizontal line. Arcing the spray gun causes uneven painting.
3176, Shinyoshida-cho, Kohoku-ku, Yokohama, 223-8501, Japan
Manual No. T942-04
Code No. 03014430
100~250 mm
(3.9~9.8 in)
