311021 9
Troubleshooting
PROBLEM CAUSE SOLUTION
Displacement pump oper-
ates, but output is low on up-
stroke
Piston ball is not seating Service piston ball. Manual 309277.
Piston packings are worn or damaged Replace packings. Manual 309277.
Displacement pump oper-
ates but output is low on
downstroke and/or on both
strokes
Strainer (34e) is clogged Clean strainer.
O-ring in pump is worn or damaged Replace o-ring. Manual 309277.
Intake valve ball is packed with material or is
not seating properly
Clean intake valve. Manual 309277.
Engine speed is too low Increase throttle setting. Manual 311018.
Suction tube air leak Tighten suction tube.
Pressure setting is too low Increase pressure. Manual 311018.
Fluid filter (11), tip filter or tip is clogged or dirty Clean filter. Manual 311018 or 311254.
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).
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 309277.
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 311018.
High engine speed at no
load
Misadjusted throttle setting Reset throttle to 3700 -- 3800 engine rpm at no
load
Worn engine governor Replace or service engine governor
Low stall or run pressure
shown on display
New pump or new packings Pump break-in period takes up to 100 gallons
of material
Faulty transducer Replace transducer
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