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PUMP PROBLEM
Doesn't operate.
Output low on both
strokes.
Output low on down
stroke.
stroke
Output low on
upstroke.
Erratic or accelerated
speed.
speed
Runs sluggishly.
Cycles, or fails to hold
pressure at stall.
Audible air leak.
Air bubbles in fluid.
Poor finish or irregular
spray pattern.
16
309340
Troubleshooting
CAUSE
Valves closed or clogged.
Fluid hose or gun obstructed.
Dried fluid on displacement rod.
Air motor parts dirty, worn, or damaged.
Air line restricted or air supply inadequate.
Valves closed or clogged.
Fluid hose/gun obstructed; hose ID too small.
Worn packings in displacement pump.
Air motor parts dirty, worn, or damaged.
Open or worn intake valve.
Open or worn intake valve.
High viscosity fluid.
Open or worn piston valve or packings.
Fluid supply exhausted, clogged suction line.
High viscosity fluid.
Open or worn piston valve or packings.
Open or worn intake valve.
Possible icing.
Worn check valves or seals.
Check air connections.
Loose suction line.
Incorrect fluid pressure at gun.
Fluid is too thin or too thick.
Dirty, worn, or damaged spray gun.
SOLUTION
Clear air line; increase air supply. Check valves open.
Clear hose or gun; use hose with larger ID.
Clean rod; always stop pump at bottom of stroke;
keep wet-cup filled with compatible solvent.
Clean or repair air motor; see motor manual.
Clear air line; increase air supply. Check valves open.
Clear hose or gun; use hose with larger ID.
Replace packings.
Clean or repair air motor; see separate motor manual.
Clear or service intake valve.
Clear or service intake valve.
Adjust intake spacers.
Clear piston valve; replace packings.
Refill supply and prime pump. Clean suction tube.
Reduce viscosity, adjust intake spacers
Clear piston valve; replace packings.
Clear or service intake valve.
Stop pump. Let ice melt.
Service pump.
Service pump.
Tighten. Use a compatible liquid thread sealant or
PTFE tape on connections.
See gun manual; read fluid manufacturer's recom-
mendations.
Adjust fluid viscosity; read fluid manufacturer's recom-
mendations.
Service gun.
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