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Troubleshooting
Before servicing this equipment always make sure to
follow the Pressure Relief Procedure on page 10.
Problem
Pump fails to operate.
Pump operates, but output is low.
Erratic or accelerated pump.
*
To determine if the fluid hose or gun is obstructed, relieve the pressure. Disconnect the fluid hose and place a
container at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump (about 20-40 psi
[140–280 kPa, 1.4–2.8 bar]). If the pump starts when the air is turned on, the obstruction is in the fluid hose or dis-
pensing device.
308302P
Check all possible problems and solutions before disas-
sembling the pump.
Cause
Restricted line or inadequate air
supply; closed or clogged valves.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small.
Fluid dried on displacement rod.
Dirty, worn, or damaged motor
parts.
Fluid is too heavy for pump priming
Held open or worn intake valve or
seals.
Exhausted fluid supply.
Fluid is too heavy for pump priming.
Held open or worn intake valve of
seals.
Held open or worn priming piston.
Worn packings in displacement
pump.
Troubleshooting
Solution
Clear; increase air supply. Ensure
that all valves are open.
Open, clear*; use a hose with a
larger ID.
Clean. Always stop pump at the bot-
tom of the stroke. Keep enclosed
wet cup 1/3 filled with a compatible
solvent.
Clean or repair; see separate motor
manual.
Use drain/purge valve. use a ram.
Clear valve. Replace seals.
Refill and prime.
Use drain/purge valve.
Clear valve. Replace seals.
Clear; service.
Replace packings.
15
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