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Troubleshooting
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Troubleshooting
Problem Cause Solution
Material will not flow out of gun Material too thick Thin material. Increase pressure at
pump.
Not enough air Open gun air valve (A) more (coun-
ter-clockwise)
Trigger adjustment set too low Rotate trigger nut clockwise to
increase (adjust) trigger travel
Nozzle too small Increase nozzle size
Gun is plugged Clean gun
Pattern too fine Material too thin Add more dry material to mix to
thicken
Air pressure too high Close gun air valve (A) partially
(clockwise)
Gun needle travel too low Rotate trigger nut clockwise to
increase (adjust) trigger travel
Nozzle too small Replace nozzle with larger size
Pattern too coarse Material too thick Add water to mix to thin material
Air pressure too low Open gun air valve (A) more (coun-
ter-clockwise)
Nozzle too large Replace nozzle with smaller size
Gun will not shut off Worn nozzle and/or needle Relieve pressure, page 9. Replace
worn parts
Nozzle retaining ring not on all the
way
Tighten completely.
Debris in gun passages Relieve pressure, page 9. Clean
gun.
Fluid leaking at flow adjustment
nut (B)
Damaged seal Relieve pressure, page 9. Replace
seal (3).
Trigger nut won’t adjust Dirty threads Clean threads.
Nozzle not on gun Put nozzle on gun.
Needle triggered Adjust when trigger is not pulled.
Air won’t shut off when gun trigger is
released (non-bleeder model only)
Debris in gun air passages Relieve pressure, page 9. Clean
gun.
Loose air fittings Tighten air fittings on gun
Worn air seals Replace air shutoff needle u-cup (4)
and/or air valve seal (18)