Troubleshooting
38 3B0070C
Pump output is low Low stall pressure. Pressure setting is
too low.
Change spray mode to High Pressure.
Turn pressure knob fully clockwise.
Make sure pressure control knob is
properly installed to allow full
clockwise position. Perform Knob
Calibration, page 32. If problem
persists, replace pressure transducer.
Pump rod damage. Repair pump. See pump manual.
Piston packings are worn or
damaged.
Replace packings. See pump manual.
O-ring in pump is worn or damaged. Replace o-ring. See pump manual.
Intake valve ball is packed with
material.
Clean intake valve. See pump manual.
Large pressure drop in hose with
heavy materials.
Reduce overall length of hose. Use
larger diameter hose.
Check extension cord for correct size. See Extension Cords, page 16.
Connecting rod assembly damaged. Replace connecting rod assembly.
Amp switch is on low setting. Switch to a 16A or 20A setting.
Motor doesn’t run
Error code on the display. Determine fault correction from
electrical, see page 39.
Motor cables damaged or loose
connections.
Reconnect or replace if necessary.
Potentiometer wire damaged or loose
connections.
Reconnect or replace if necessary.
Control board, see page 40. Replace power cord or control board.
Additional motor troubleshooting. See page 41.
Motor runs but pump does not stroke Connecting rod assembly damaged. Replace connecting rod assembly.
Excessive paint leakage into throat
packing nut
Throat packing nut is loose. Remove throat packing nut spacer.
Tighten throat packing nut just
enough to stop leakage.
Throat packings are worn or
damaged.
Replace packings.
Displacement rod is worn or
damaged.
Replace rod.
Fluid is spitting from gun Air in pump or hose. Cycle pump as slowly as possible
during priming. Purge paint through
gun by following Startup, page 22.
Spray tip is partially clogged. Clear tip. See Clear Spray Tip Clog,
page 26.
Fluid supply is low or empty. Refill fluid supply. Prime pump. Check
fluid supply often to prevent running
pump dry.
Pump is difficult to prime Clog in prime valve. Remove prime valve, check for clogs,
replace.
Air in pump or hose. Check and tighten all fluid
connections. Cycle pump as slowly as
possible during priming.
Intake valve is leaking. Clean intake valve. Be sure ball seat is
not nicked or worn and that ball seats
well. Reassemble valve.
Pump packings are worn. Replace pump packings. See pump
manual.
Paint is too thick. Thin the paint according to supplier
recommendations.
Pump loses prime Leak in suction tube. Replace suction tube.
Debris stuck in inlet ball. Remove foot valve and clean with
appropriate cleaning solution.
Problem
What to Check
If check is OK, go to next check
What to Do
When check is not OK, refer to
this column
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