This article features a selection of common problems applicators have experienced with the Fusion Air Purge spray gun along with the cause and solution.
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Gun does not fully actuate when triggered | Safety lock engaged | Disengage safety lock |
| Plugged muffler | Clean | |
| Damaged air valve o-rings | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Fluid does not spray when gun is fully actuated | Closed fluid valves | Open |
| Plugged impingement ports | Clean | |
| Plugged check valves | Clean |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Gun actuates slowly | Plugged muffler | Clean |
| Damaged piston o-rings | Replace | |
| Dirty air valve, or damaged o-rings | Clean air valve or replace o-rings |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Gun delays, then actuates abruptly | Cured material around side seals | Inspect side seals and mix chamber for scratches, Replace |
| Retaining ring not bottomed out | Tighten retaining ring until bottomed out |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Loss of round pattern | Dirty mix chamber nozzle | Clean |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Loss of flat pattern | Plugged spray tip | Clean in compatible solvent |
| Worn tip | Replace | |
| Dirty mix chamber nozzle | Clean |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Leakage between flat tip and mix chamber | Damaged side seals | Replace |
| Damaged mix chamber | Replace | |
| Damaged side seal o-rings | Replace | |
| Tightened air cap with fluid valves open | Close valves first |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Fluid mist from mix chamber or air cap | Damaged side seals | Replace |
| Damaged mix chamber | Replace | |
| Damaged side seal o-rings | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Excessive overspray | Too much cleanoff air | Reduce |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Rapid buildup of material on air cap | Plugged air cap holes | Clean |
| Too little cleanoff air | Increase | |
| Damaged/missing fluid housing o-ring | Replace | |
| Damaged front o-ring | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Reduced cleanoff air | Damaged front o-ring | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Excessive cleanoff air when fluid valves are closed and gun is triggered | Damaged/missing fluid housing o-ring | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Fluid does not shut off when fluid valves are closed | Damaged fluid valves | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Burst of air from muffler when gun is triggered | Normal | No action required |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Steady air leakage from muffler | Damaged air valve o-rings | Replace |
| Damaged piston o-rings | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Air leakage from front air valve | Damaged air valve o-rings | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Air leak around lock ring | Damaged o-ring | Replace |
| SYMPTOM | CAUSE | SOLUTION |
|---|---|---|
| Cannot tighten retaining ring until it bottoms out | Air cap assembled before retaining ring | Install retaining ring first, then air cap |