Graco EM 380 Instructions-Parts List Manual page 3

SERVICE
^ ,
Service instructions are given in the following
paragraphs. Check everything in the chart
before dis-
assembling any part of the sprayer.
WARNING
Always disconnect sprayer
from power source
and relieve system pressure before attempting any
service.
TROUBLESHOOTING GUIDE
PROBLEM CAUSE SOLUTION
Electric motor won't run Power cord unplugged, or building circuit fuse Check, replace
blown
Overload switch has opened Unplug cord'. decrease pressure
Pressure setting too low Increase
Electric motor stops while spraying Power cord unplugged o* hl,':~', ~-' Git fuse Check, replace
blown
Overload switcCl has opened
Unplug cord", relieve pressure, allow
to cool, decrease pressure
Pressure setting too low Increase
Tip or filter plugged Remove and clean
Electric motor runs but output low Piston ball check not seating Service, see disp. pump service
Piston packings worn or damaged
Replace, see disp. pump service
Intake valve ball check not seating Service, see disp. pump service
Displacement pump frozen or gear train damage Thaw**, replace
Electric motor runs, but no output Displacement pump frozen or gear train damage Thaw'"
Electric motor labors when starting, Capacitor failure Replace capacitor
blowing fuses
Paint leaks into wet-cup Throat packings worn or damaged
Replace, see disp. pump service
Excessive surge at spray gun Tip or filter plugged Remove and clean
Spray tip too big or worn Change tip see manual 307-321
Paint too viscous Thin
Wrong type hose Use minimum 50 ft (15.2 m) static free
nylon hose only -wire braid hose unac
ceptable
Not enough paint pressure Pressure setting too low Increase
Spray tip too big or worn Change tip - see manual 307-321
Tails or fingers in spray pattern Pressure setting too low Increase
Outlet filter dirty or plugged
Clean
Spray tip too big or worn Change tip see manual 307-321
Paint supply low or pail empty
Fill
Paint too viscous Thin
Wrong type hose Use -?inimL*m 50 ft (15.2 m) static free
rylr~ hose only -wire braid hose unac
ceptable
Paint runs or sags Outlet filter dirty or plugged Clean-see manual 307-273
Spitting from spray gun Paint supply low or pail empty Fill
Sprayer sucking air or gun needle not seating Tighten fittings, service gun -see
manual 307-046
Static sparking from spray gun Sprayer or work not grounded Check, ground
*The electric motor has an overheating protector switch which automatically resets on cooling. If it opens. unplug unit and let it
cool for 30 to 60 minutes. Also try to correct the cause of overheating. Always use the lowest pressure setting needed.
**Freezing results from failure to replace flushing water with mineral spirits solvent.