Troubleshooting
22 3A4399A
Pump output is low Pump rod damage Repair pump. See Pump, page 40.
Low stall pressure Turn pressure knob fully clockwise. Make sure
pressure control knob is properly installed to
allow full clockwise position. If problem per-
sists, replace pressure transducer.
Piston packings are worn or dam-
aged
Replace packings; see pump manual.
O-ring in pump is worn or damaged Replace o-ring. See Pump, page 40.
Intake valve ball is packed with mate-
rial
Clean intake valve; see pump manual.
Pressure setting is too low Increase pressure. See Pump, page 40.
Large pressure drop in hose with
heavy materials
Use larger diameter hose and/or reduce overall
length of hose.
Motor runs but pump does
not stroke
Displacement pump pin damaged or
missing; see pump manual.
Replace pump pin if missing. Be sure retainer
spring is fully in groove all around connecting
rod; see pump manual.
Connecting rod assembly damaged;
see pump manual.
Replace connecting rod assembly. See Pump,
page 40.
Gears or drive housing damaged. Inspect drive housing assembly and gears for
damage and replace if necessary. See Pump,
page 40.
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 dam-
aged
Replace packings. See Pump, page 40.
Displacement rod is worn or dam-
aged
Replace rod. See Pump, page 40.
Fluid is spitting from gun Air in pump or hose Check and tighten all fluid connections. Cycle
pump as slowly as possible during priming.
Tip is partially clogged Clear tip. See Clear Tip Clog, page 12.
Fluid supply is low or empty Refill fluid supply. Prime pump; see pump man-
ual. Check fluid supply often to prevent running
pump dry.
Pump is difficult to prime
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. Reas-
semble valve.
Pump packings are worn Replace pump packings. See Pump, page 40.
Paint is too thick Thin the paint according to supplier recommen-
dations.
No display, sprayer
operates
Display is damaged or has bad con-
nection
Check connections. Replace display.
TYPE OF 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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