Graco Pro 270GS Operation page 23

Problem
Pump does not prime.
Pump cycles but does not build up
pressure.
3A2818A
Cause
Prime/Spray Valve is in SPRAY posi-
tion.
Inlet screen is clogged or suction
tube is not immersed.
Pump was not primed with flushing
fluid.
Inlet valve check ball is stuck.
Inlet valve check ball or seat is dirty
Outlet valve check ball is stuck.
Suction tube is leaking.
Pump does not prime with fluid.
Fluids are viscous or sticky.
Engine speed is too high
Pump is not primed.
Inlet screen is clogged .
Suction tube is not immersed in paint. Make sure suction tube is immersed
Suction tube is leaking, allowing air to
enter.
Prime/Spray Valve is worn or
obstructed with debris.
Pump check ball is stuck.
Troubleshooting
Solution
Turn Prime/Spray Valve to PRIME
position (pointing down).
Clean debris off inlet screen and
make sure suction tube is immersed
in fluid.
Remove suction tube from paint.
Prime pump with water or
solvent-based flushing fluid, page 10.
Remove suction tube and place a
pencil into the inlet section to dis-
lodge the ball, allowing pump to
prime properly.
Remove inlet fitting. Clean or replace
ball and seat.
Take sprayer to Graco authorized
service center.
Tighten suction tube connection.
Inspect for cracks or vacuum leaks.
Remove suction tube from paint.
Prime pump with water or sol-
vent-based flushing fluid.
Thin paint per manufacturers guide-
lines.
Decrease throttle setting before prim-
ing
Prime pump.
Clean debris off inlet screen and
make sure suction tube is immersed
in fluid.
in paint.
Tighten suction tube connection.
Inspect for cracks or vacuum leaks. If
cracked or damaged, replace suction
tube.
Take sprayer to Graco authorized
service center.
Read Pump does not prime section
in Troubleshooting, page 23.
23