Troubleshooting
311020Y 9
Pinion assembly is worn or damaged Repair or replace pinion assembly. Page 13.
Pump output is low Strainer (34f) is clogged Clean strainer.
Piston ball is not seating Service piston ball. 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 not seating properly Clean intake valve. See pump manual.
Intake valve ball is packed with material Clean intake valve. See pump manual.
Engine speed is too low Increase throttle setting. See operation
manual.
Clutch is worn or damaged Replace clutch. Page 13.
Pressure setting is too low Increase pressure. See operation manual.
Fluid filter (11), tip filter or tip is clogged
or dirty
Clean filter. See operation or spray gun
manual.
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
performance (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. See pump manual.
Displacement rod is worn or damaged Replace rod. See pump manual.
Fluid is spitting from gun Air in pump or hose Check and tighten all fluid connections.
Reprime pump. See operation manual.
Tip is partially clogged Clear tip. See spray gun manual.
Fluid supply is low or empty Refill fluid supply. Prime pump. See
operation manual. 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.
Reassemble
Pump packings are worn Replace pump packings. See pump manual.
Paint is too thick Thin the paint according to the supplier’s
recommendations
Engine speed is too high Decrease throttle setting before priming
pump. See operation manual.
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.
High engine speed at no load Misadjusted throttle setting Reset throttle to 3600 engine rpm at no load
Worn engine governor Replace or service engine governor
Problem Cause Solution
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