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PROBLEM CAUSE REMEDY
Unit will not run Blown panel fuse or tripped Check and replace/reset
breaker
Unit not plugged in Plug in
Pressure control knob set too low Turn knob to higher pressure
Faulty or loose wiring Inspect/Take to SprayTech Authorized Service
Center
Worn motor brushes Check and replace brushes
Clogged Tip or Filters Clean tip and filters.
Faulty On/Off switch fuse Take to SprayTech Authorized Service Center
Unit will not prime Dried out piston packings Remove siphon tube and feel lower ball check to
be sure it is free to move off its seat. Place full
cup of paint thinner over end of fluid section and
turn on pump.
Pump inlet screen plugged Remove and clean.
Air in pump or hose Hold gun trigger in open position and run unit
about 10 seconds until air is purged
Check for siphon tube leak
Packings worn Replace packings. (See page 14)
Fluid is too viscous Prime pump with compatible solvent. Bring pump
up to pressure. Carefully remove pump from
solvent container and immerse inlet tube in heavy
material to be sprayed. With nozzle tip removed,
trigger gun until heavy material appears at gun.
Replace nozzle tip.
Siphon tube clogged Remove and clean
Siphon tube air leak Check connection and seal
Clogged tip Relieve pressure, remove tip and clean.
Unit will not build or Pressure adjusting knob not Adjust to increase pressure
maintain pressure properly set
Pump inlet strainer dirty Clean
Valve balls or seals worn or dirty Replace or clean
Air in pump or hose Hold gun trigger in open position and run about 10
seconds until air is purged
Packings worn Replace (See Page 14)
Worn spray tip Replace (Follow direction supplied with gun)
Internal leakage With gun trigger closed, allow unit to pump up to
pressure and shut off if pump momentarily starts.
Internal leak is indicated and fluid section rebuild
is necessary. (See Page14)
Fluid leak Check for external leaks including hydraulic
fittings attached to pressure control housing
Fluid too viscous Consult manufacturers recommendations on paint
container label
Spray tip too large Change tip
Fluid leakage at upper Upper packing worn Relieve pressure and tighten packing take up nut
end of fluid section or replace packings. (See Page 14)
Piston rod worn Replace. (See Page 14)
TROUBLESHOOTING