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Troubleshooting
313313A 25
Pump output is low Strainer is clogged Clean strainer.
Piston ball is not seating Service piston ball. Manual 310643.
Piston packings are worn or damaged Replace packings. Manual 310643.
O-ring in pump is worn or damaged Replace o-ring. Manual 310643.
Intake valve ball is not seating properly Clean intake valve. Manual 310643.
Intake valve ball is packed with material Clean intake valve. Manual 310643.
Engine speed is too low Increase throttle setting.
Clutch is worn or damaged Adjust or replace clutch. Page 37.
Pressure setting is too low Increase pressure.
Fluid filter, tip filter or tip is clogged or
dirty
Clean filter. Manual 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
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. Manual 310643.
Displacement rod is worn or damaged Replace rod. Manual 310643.
Fluid is spitting from gun Air in pump or hose Check and tighten all fluid connections.
Reprime pump.
Tip is partially clogged Clear tip. Manual 309640.
Fluid supply is low or empty Refill fluid supply. Prime pump. 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 valve.
Pump packings are worn Replace pump packings. Manual 310643.
Paint is too thick Thin the paint according to the supplier's
recommendations
Engine speed is too high Decrease throttle setting before priming pump.
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 3300 engine rpm at no load.
Worn engine governor Replace or service engine governor
Problem Cause Solution