Troubleshooting
3A3426EOperation 51
Displacement pump operates
but output is low on
downstroke and/or on both
strokes.
Strainer is clogged. Clean strainer.
O-ring in pump is worn or damaged. Replace o-ring. See Pump manual 309277.
Intake valve ball is packed with material or is
not seating properly.
Clean intake valve. See Pump manual 309277.
Engine speed is too low. Increase throttle setting.
Suction tube air leak. Tighten suction tube.
Pressure setting is too low. Increase pressure.
Fluid filter, tip filter or tip is clogged or dirty. Clean filter.
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 (22 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. Reassemble
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.
High engine speed at no load. Mis-adjusted 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.
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 309277.
Displacement rod is worn or damaged. Replace rod. See Pump manual 309277.
Fluid is spitting from gun. Air in pump or hose. Check and tighten all fluid connections. Reprime
pump.
Tip is partially clogged. Clear tip.
Fluid supply is low or empty. Refill fluid supply. Prime pump. Check fluid
supply often to prevent running pump dry.
Excessive leakage around
hydraulic motor piston rod
wiper.
Piston rod seal worn or damaged. Replace these parts.
Problem Cause Solution
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