Troubleshooting
Troubleshooting
1. Follow Pressure Relief Procedure, page 14.
2. Check all possible causes and problems before
disassembling pump.
3. See air motor manual for air motor specific
troubleshooting
* To determine if fluid hose or gun is obstructed,
follow Pressure Relief Procedure, page 14.
Disconnect 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.
Problem Cause Solution
Valve clo sed or clogged.
Clear air line; increase air supply.
Check that valves are open.
Fluid hose or gun obstructed.
Clean hose or gun.*
Dried fluid on displacement rod. Clean rod; always stop pump at
bottom of stroke; keep wet-cup
filled with compatible solvent.
Does not operate.
Air moto
r parts dirty, worn, or
damage
d.
Clean or repair air motor. See
motor manual.
Air line restricted o r air supply
inadequate. Valves closed or
clogged.
Clear air line; increase air supply.
Check that valves are open.
Fluid hose/gun obstructed; hose ID
too small.
Clear hose or gun*; use hose with
larger ID.
Output low on both strokes.
Air motor icing.
Open De-Ice contro l.
Open or worn intake valve. Clear or service intake valve.Output low on down stroke.
High viscosity fluid.
Adjust intake spacers.
Output low on upstroke. Open or worn piston valve or
packings.
Clear piston valve; replace
packings.
Fluid supply exhausted, clogged
suction.
Refill supply and prime pump.
Clean suction tube.
High viscosity fluid.
Reduce viscosity; adjust intake
spacers.
Open or worn piston valve or
packings.
Clear piston valve; replace
packings.
Erratic accelerated speed.
Open or worn intake valve. Clear or service intake valve.
Runs sluggishly. Possible icing. Stop pump. Open De-Ice control.
Cycles or fails to hold pressure at
stall.
Worncheckvalvesorseals. Service lower. See
Remove Lower, page 22,and
Xtreme Lowers manual (311762).
Air bubbles in fluid.
Loose suction line. Tighten. Use compatible liquid
thread sealant or PTFE tape on
connections.
Incorrect fluid pressure at gun. See gun manual; read fluid
manufacturer’s recommendations.
Poor finish or irregular spray
pattern.
Fluid is too thin or too thick.
Adjust fluid viscosity; read fluid
manufacturer’s recommendations.
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