Troubleshooting
40 313483A
Pump output is low
(Base Coat Pump see pages 70.
Top Coat Pump see manual 310894)
Strainer (82) is clogged Clean strainer.
Piston ball is not seating Service piston ball.
Piston packings are worn or damaged Replace packings.
O-ring in pump is worn or damaged Replace o-ring.
Intake valve ball is not seating properly Clean intake valve.
Intake valve ball is packed with material Clean intake valve.
Engine speed is too low Increase throttle setting.
Clutch is worn or damaged Adjust or replace clutch. Page 57.
Pressure setting is too low Increase pressure.
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.
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.
Displacement rod is worn or damaged Replace rod.
Fluid is spitting from gun Air in pump or hose Check and tighten all fluid connections. Rep-
rime 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.
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.
Paint is too thick Thin the paint according to the supplier's rec-
ommendations
Engine speed is too high Decrease throttle setting before priming pump.
Prime/Drain valve is plugged
Material hardened in valve Operate drain valve at least once per hour
when spraying.
Flush valve more thoroughly when cleaning
sprayer.
Aggregate packed up in valve Valve is opened too slowly and/or aggregate is
too large.
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
No display, sprayer operates Display damaged or has bad connec-
tion
Check connections. Replace display.
Problem Cause Solution
