campbell hausfeld airless paint sprayer won t prime

Remove siphon tube and feel lower ball check to be sure it is free to move off its seat. Dried out piston packings and stuck ball valves. If the light is 'OFF', proceed to Step 3. Check if the green power light on the board is lit. Remove the electrical cover on the bottom of the machine. Ensure the ON-OFF toggle switch is in the 'ON' position and that the Pressure Control Knob is fully CW (maximum pressure). Ensure suction nut is tight and lower ball cage O-ring is not worn. Inspect suction hose for holes, if so equipped. Unit hose air leak (bubbles blowing out bypass hose.) Service upper and lower check ball valve.Ģ. Upper or lower ball is stuck or obstructed. The displacement pump operates but the unit does not prime.ġ. The displacement pump operates but the pressure is too low.Ģ. The upper check valve ball is not seating properly.Ģ. The displacement operates, but the output is too low on the upstroke.ġ.

Service the lower check valve ball check. The lower check valve ball is not seating properly. The displacement pump operates, but the output is too low on the down stroke or both strokes.ġ.

There is a large pressure drop in the fluid hose.

The fluid displacement pump filter (if used) is clogged.ĥ. Remove the tip and/or filter and clean them.Ĥ. The motor and displacement pump operates, but paint pressure is too low, or none. The displacement is seized by dried paint. The motor operates, but the paint pump doesn't.Ģ. Air entrapped in the fluid pump of the hose.Ĭheck for loose connections on the siphon assembly, tighten, then re-prime pump.Ģ.

Campbell hausfeld airless paint sprayer won t prime