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| Troubleshooting | |
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Problem | Cause | Solution | |
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Output low on both | Air line restricted or air supply inadequate. Valves | Clear air line; increase air supply. Check that | |
strokes. | closed or clogged. | valves are open. | |
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| Fluid hose/gun obstructed. | Clear hose or gun*. | |
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| Air motor icing. | See air motor manual for instructions. | |
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| Exhausted fluid supply. | Refill and prime pump. | |
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| Worn piston packings. | Replace. | |
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| Open or worn intake valve. | Clear or service intake valve. | |
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Pump output low on | Held open or worn ball check valves. | Check and repair. | |
only one stroke. |
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Worn piston packings. | Replace. | ||
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No output. | Improperly installed ball check valves. | Check and repair. | |
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Pump operates errati- | Exhausted fluid supply. | Refill and reprime pump. | |
cally. |
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Held open or worn ball check valves. | Check and repair. | ||
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| Worn piston packing. | Replace. | |
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| Suction tube too restrictive, causing pump to cavi- | Use larger diameter tube | |
| tate |
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Erratic accelerated | Fluid supply exhausted, clogged suction. | Refill supply and prime pump. Clean suction tube. | |
speed. |
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High viscosity fluid. | Reduce viscosity; increase fluid temperature, | ||
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| reduce flow rate by using smaller tip. | |
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| Open or worn piston valve or seal. | Clear piston valve; replace seal. | |
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| Open or worn intake valve. | Clear or service intake valve. | |
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Runs sluggishly. | Possible icing. | See air motor manual for instructions. | |
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| Filler material clumping causing extra friction on | Flush pump and replace packings. | |
| rods and seals. |
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Cycles or fails to hold | Worn check valves or seals. | Service lower. See lower manual for instructions. | |
pressure at stall. |
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Air bubbles in fluid. | Loose suction line. | Tighten. Use compatible liquid thread sealant or | |
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| PTFE tape on connections. | |
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Poor finish or irregular | Incorrect fluid pressure at gun. | See gun manual; read fluid manufacturer’s recom- | |
spray pattern. |
| mendations. | |
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| Fluid is too thin or too thick. | Adjust fluid viscosity; read fluid manufacturer’s rec- | |
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| ommendations. | |
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| Dirty, worn, or damaged spray gun. | Service spray gun. See spray gun manual. | |
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Difficulty priming | Inlet ball stuck to seat | Tap pump with hammer to dislodge. | |
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| Remove inlet ball, flush dried material, | |
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| inlet ball. | |
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| Suction hose/strainer too restrictive or clogged | Clean inlet strainer, shorten hose length and/or | |
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| increase hose diameter (especially cold or viscous | |
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| material. | |
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*To determine if fluid hose or gun is obstructed, follow Pressure Relief Procedure and Shutdown, page 24. Dis- connect fluid hose and place a container at pump fluid outlet to catch any fluid. Turn on air power just enough to start pump. If pump starts, the obstruction is in fluid hose or gun.
**The runaway solenoid can still be actuated if the Runaway Error is not displayed. Also, disabling the runaway monitor will not retract the solenoid.
3A2012J | 41 |
