Troubleshooting
PROBLEM | CAUSE | SOLUTION | |
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Fluid pressure low or dropping | Air supply pressure low when spray- | Increase inlet air pressure | |
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| Increase air compressor size to meet | ||
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| flow requirements | |
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| Remove airline quick disconnects | |
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| Use 3/8 in. (0.95 cm) ID or larger air | |
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| supply hose. Use 1/2 in. (12.7 mm) if | |
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| longer than 25 ft (7.6 m). | |
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| Icing in air motor exhausts or mufflers | Check inlet filter water separator; see | |
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| page 25. Stop spraying while ice | |
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| melts. | |
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Pump output low, but pressure is nor- | Obstructed gun impingement ports or | Flush and clean gun; see gun manual | |
mal | filters |
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One pressure gauge drops when | Leaking pump throat | Repair pump; see 309577 | |
pumps are stalled on both the |
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Leak between pump and gun | Check fluid tubes, heater, and hoses | ||
upstroke and the downstroke | |||
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| Pressure Relief/Spray valve leaking | ||
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| back to supply | |
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| Spray gun is leaking on one side or | Clean and repair spray gun | |
| plugged on the other side |
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One pressure gauge drops when | Inlet ball check not sealing | Clean or replace; see 309577 | |
pumps are stalled on the downstroke, |
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Inlet check seat | Repair pump; see 309577 | ||
but not the upstroke |
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One pressure gauge drops when | Piston check ball not sealing | Repair pump; see 309577 | |
pumps are stalled on the upstroke, |
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Piston packing not sealing | Repair pump; see 309577 | ||
but not the downstroke | |||
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Loose piston stud in pump | Repair pump; see 309577 | ||
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| Bad inside sleeve seal | Repair | |
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A side rich; lack of B side | A side gauge is low | B side restriction downstream of | |
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| gauge. Check gun check valve | |
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| screen, mix module, or mix manifold | |
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| restrictor. | |
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| A side impingement port is worn. | |
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| B side gauge is low | B side material supply problem. | |
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| Check B side inlet strainer and pump | |
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| intake valve. | |
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B side rich; lack of A side | A side gauge is low | A side material supply problem. | |
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| Check A side inlet strainer and pump | |
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| intake valve. | |
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| B side gauge is low | A side restriction downstream of | |
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| gauge. Check gun check valve | |
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| screen, mix module, or mix manifold | |
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| restrictor. | |
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| B side impingement port is worn. | |
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16 | 3A1570A |
