Fusion AP Trouble Shooting

This article features a selection of common problems applicators have experienced with the Fusion Air Purge spray gun along with the cause.

Gun does not fully actuate when triggered.

Safety lock engaged
Plugged muffler
Damaged air valve o-rings

Fluid does not spray when gun is fully actuated.

Closed fluid valves
Plugged impingement ports
Plugged check valves

Gun actuates slowly.

Plugged muffler
Damaged piston o-rings
Dirty air valve, or damaged o-rings

Gun delays, then actuates abruptly.

Cured material around side seals
Retaining ring not bottomed out

Loss of round pattern.

Dirty mix chamber nozzle
Worn mix chamber

Loss of flat pattern.

Plugged spray tip
Worn tip
Dirty mix chamber nozzle

Fluid mist from mix chamber or air cap.

Damaged side seals
Damaged side seal o-rings
Damaged mix chamber

Excessive overspray.

Too much cleanoff air

Rapid buildup of material on air cap.

Plugged air cap holes
Too little cleanoff air
Damaged/missing fluid housing o-ring
Damaged front o-ring

Reduced cleanoff air.

Damaged front o-ring

Excessive cleanoff air when fluid valves are closed and gun is triggered.

Damaged/missing fluid housing o-ring

Fluid does not shut off when fluid valves are closed.

Damaged fluid valves

Steady air leakage from muffler.

Damaged air valve o-rings
Damaged piston o-rings

Air leakage from front air valve.

Damaged air valve o-rings

Air leak around lock ring.

Damaged o-ring

Cannot tighten retaining ring until it bottoms out.

Air cap assembled before retaining ring