311020 9
Troubleshooting
PROBLEM CAUSE SOLUTION
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 thr ot t le setti ng. See oper at i on 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 manu-
al.
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. 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. Reas-
semble valve.
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
Misadjusted throttle setting Reset throttle to 3600 engine rpm at no load
oa
Worn engine governor Replace or service engine governor
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