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3088706
PROBLEM CAUSE SOLUTION
Pump output is low
Strainer (31) is clogged Clean strainer
Piston ball (25) is not seating Service piston ball. Manual 308798.
Piston packings are worn or damaged Replace packings. Manual 308798.
O-ring (227) in displacement pump is worn or
damaged
Replace o-ring. Manual 308798.
Intake valve ball is not seating properly Clean intake valve. manual 308798.
Engine speed is too low Increase throttle setting. Manual 308867.
Clutch is worn or damaged Replace clutch. Page 9.
Pressure setting is too low Increase pressure. Manual 308867.
Fluid filter (318), tip filter or tip is clogged or
dirty
Clean filter. Manual 308867 or 309091.
Large pressure drop in hose with heavy
materials
Use larger diameter hose and/or reduce overall
length of hose. Use of more than 100 ft of 1/4
in. hose significantly reduces performance of
sprayer. Use 3/8 in. hose for optimum perfor-
mance (50 ft minimum).
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. Manual 308798.
Displacement rod is worn or damaged Replace rod. Manual 308798.
Fluid is spitting from gun
Air in pump or hose Check and tighten all fluid connections.
Reprime pump. Manual 308867.
Tip is partially clogged Clear tip. Manual 309091.
Fluid supply is low or empty Refill fluid supply. Prime pump. Manual
308867. 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.
Reduce engine speed and 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. Manual 308798.
Paint is too thick Thin the paint according to the supplier’s
recommendations
Engine speed is too high Decrease throttle setting before priming pump.
Manual 308867.
Clutch squeaks each time
clutch engages
Clutch surfaces are not matched to each other
when new and may cause noise
Clutch surfaces need to wear into each other.
Noise will dissipate after a day of run time
Engine stalls
Engine speed is to slow D Increase throttle setting
D Adjust engine speed at no load to 3750 –
3850 rpm
Fluid filter is clogged Relieve pressure and clean filter
Too much pump friction (new pump) Reduce pressure to 3000 psi until pump wears
in
Spark plug wire is loose Reconnect wire