Graco 313483A Operation - Repair - Parts page 40

Troubleshooting
Problem
Pump output is low
(Base Coat Pump see pages 70.
Top Coat Pump see manual 310894)
Excessive paint leakage into throat
packing nut
Fluid is spitting from gun
Pump is difficult to prime
Prime/Drain valve is plugged
Clutch squeaks each time clutch
engages
High engine speed at no load
No display, sprayer operates
40
Cause
Strainer (82) is clogged
Piston ball is not seating
Piston packings are worn or damaged
O-ring in pump is worn or damaged
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
Clutch is worn or damaged
Pressure setting is too low
Tip filter or tip is clogged or dirty
Large pressure drop in hose with heavy
materials
Throat packing nut is loose
Throat packings are worn or damaged
Displacement rod is worn or damaged
Air in pump or hose
Tip is partially clogged
Fluid supply is low or empty
Air in pump or hose
Intake valve is leaking
Pump packings are worn
Paint is too thick
Engine speed is too high
Material hardened in valve
Aggregate packed up in valve
Clutch surfaces are not matched to
each other when new and may cause
noise
Misadjusted throttle setting
Worn engine governor
Display damaged or has bad connec-
tion
Solution
Clean strainer.
Service piston ball.
Replace packings.
Replace o-ring.
Increase throttle setting.
Adjust or replace clutch. Page 57.
Increase pressure.
Clean filter.
Use larger diameter hose and/or reduce overall
length of hose.
Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leakage.
Replace packings.
Replace rod.
Check and tighten all fluid connections. Rep-
rime pump.
Clear tip.
Refill fluid supply. Prime pump. Check fluid
supply often to prevent running pump dry.
Check and tighten all fluid connections.
Reduce engine speed and cycle pump as
slowly as possible during priming.
Clean intake valve. Be sure ball seat is not
nicked or worn and that ball seats well. Reas-
semble valve.
Replace pump packings.
Thin the paint according to the supplier's rec-
ommendations
Decrease throttle setting before priming pump.
Operate drain valve at least once per hour
when spraying.
Flush valve more thoroughly when cleaning
sprayer.
Valve is opened too slowly and/or aggregate is
too large.
Clutch surfaces need to wear into each other.
Noise will dissipate after a day of run time.
Reset throttle to 3300 engine rpm at no load.
Replace or service engine governor
Check connections. Replace display.
313483A