Troubleshooting
Problem | Cause | Solution |
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Fluid needle will not trigger. | Loose or missing fluid needle stop | Replace stop or tighten setscrew. |
| (29) or setscrew (30). |
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| Air leaking around piston (3). | Replace |
| Swollen piston | Replace |
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| piston in solvent. |
| Insufficient air pressure on trigger. | Increase air pressure or clean air |
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| line. |
| Plug (19) is in incorrect fluid port. | Move plug to fluid port consistent |
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| with manifold plumbing, unless |
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| you are using gun in a circulating |
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| system. If you are, all fluid ports in |
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| gun and on manifold should be |
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| open. |
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Fluid does not shut off. | Worn | Replace |
| Piston cap (4) not fully tightened. | Tighten piston cap until it bottoms |
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| out. |
| Spring (6) not in place. | Check spring position. |
| Swollen piston | Replace |
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| piston in solvent. |
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Spray Pattern Troubleshooting
Problem | Cause | Solution |
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Fluid flow is fluttering while spray- | Fluid nozzle is not tight enough. | Tighten fluid nozzle to 60 |
ing. |
| (6.8 N•m). |
| Replace | |
| aged. |
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| Fluid filter is clogged. | Check fluid filter. |
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Fluid flow fades while spraying | Fluid pressure is too low, causing | Raise fluid pressure at source or |
high viscosity fluids. | fluid flow to reduce when gun is | use a smaller fluid nozzle. |
| elevated. |
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Pattern becomes | Air cap horn holes plugged or | Clean air cap horn holes with |
on ends. | damaged. | |
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| pick, or replace air cap. |
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Gun fluid pressure is too high with | Using needle/nozzle kit with too | Use needle/nozzle kit with larger |
gun triggered. | small orifice. | orifice. |
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Fluid system will not operate at | There is no fluid regulator, or air | Add low pressure fluid regulator, |
low enough fluid pressure [below | regulator on pressure pot is not | or add more sensitive low pres- |
10 psi (70 kPa, 0.7 bar)]. | sensitive enough at low pressures. | sure air regulator on pressure pot. |
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22 | 313516C |
