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Troubleshooting<br />
PUMP PROBLEM CAUSE SOLUTION<br />
Doesn’t operate. Valves closed or clogged. Clear air line; increase air supply. Check valves open.<br />
Output low on both<br />
strokes.<br />
Output low on down<br />
stroke.<br />
Output low on<br />
upstroke.<br />
Erratic or accelerated<br />
speed.<br />
Fluid hose or gun obstructed.<br />
Dried fluid on displacement rod.<br />
Air motor parts dirty, worn, or damaged.<br />
Air line restricted or air supply inadequate.<br />
Valves closed or clogged.<br />
Fluid hose/gun obstructed; hose ID too small.<br />
Worn packings in displacement pump.<br />
Air motor parts dirty, worn, or damaged.<br />
Open or worn intake valve.<br />
Open or worn intake valve.<br />
High viscosity fluid.<br />
Open or worn piston valve or packings.<br />
Fluid supply exhausted, clogged suction line.<br />
High viscosity fluid.<br />
Open or worn piston valve or packings.<br />
Open or worn intake valve.<br />
Clear hose or gun; use hose with larger ID.<br />
Clean rod; always stop pump at bottom of stroke;<br />
keep wet-cup filled with compatible solvent.<br />
Clean or repair air motor; see motor manual.<br />
Clear air line; increase air supply. Check valves open.<br />
Clear hose or gun; use hose with larger ID.<br />
Replace packings.<br />
Clean or repair air motor; see separate motor manual.<br />
Clear or service intake valve.<br />
Clear or service intake valve.<br />
Adjust intake spacers.<br />
Clear piston valve; replace packings.<br />
Refill supply and prime pump. Clean suction tube.<br />
Reduce viscosity, adjust intake spacers<br />
Clear piston valve; replace packings.<br />
Clear or service intake valve.<br />
Runs sluggishly. Possible icing. Stop pump. Let ice melt.<br />
Cycles, or fails to hold<br />
pressure at stall.<br />
Worn check valves or seals.<br />
Service pump.<br />
Audible air leak. Check air connections. Service pump.<br />
Air bubbles in fluid. Loose suction line. Tighten. Use a compatible liquid thread sealant or<br />
PTFE tape on connections.<br />
Poor finish or irregular<br />
spray pattern.<br />
<strong>Inc</strong>orrect fluid pressure at gun.<br />
Fluid is too thin or too thick.<br />
Dirty, worn, or damaged spray gun.<br />
See gun manual; read fluid manufacturer’s recommendations.<br />
Adjust fluid viscosity; read fluid manufacturer’s recommendations.<br />
Service gun.<br />
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