Troubleshooting
311159A
9
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
(counter-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
(counter-clockwise)
Nozzle too large
Replace nozzle with smaller size
Gun will not shut off
Worn nozzle and/or needle
Relieve pressure
, page 3. Replace
worn parts
Nozzle retaining ring not on all the
way
Tighten completely.
Debris in gun passages
Relieve pressure
, page 3. Clean
gun.
Fluid leaking at flow adjustment
nut (B)
Damaged seal
Relieve pressure,
page 3. 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 3. 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)