Troubleshooting
3A4416A
37
Sprayer runs, but pump does not
prime or looses prime while in use.
(Pump cycles but does not pump
paint or build pressure.)
Prime/Spray valve is in SPRAY
position.
Lift Prime/Spray valve to PRIME
position until paint exits drain tube.
The pump is now primed.
Inlet strainer is clogged or suction
tube is not immersed in paint.
Clean debris off inlet strainer and
make sure suction tube is immersed
in paint.
Inlet valve ball is stuck or dirty.
Remove suction tube and place a
pencil into the inlet section to dislodge
the ball, see page 15. Clean inlet
valve ball, see page 16, OR Power
Flush Sprayer, see page 23.
Thick or “sticky” paint.
Some fluids may prime faster if the
ON/OFF switch is momentarily turned
off so the pump can slow and stop.
Turn ON/OFF switch on and off
several times if necessary, see page
Suction tube is leaking.
Inspect suction tube connection for
cracks or vacuum leaks.
Outlet valve ball is stuck.
Unscrew outlet valve, remove, and
clean assembly, see page 15.
Debris in paint.
Strain the paint. See page 12.
Prime/Spray valve is worn or
obstructed with debris.
Take sprayer to Graco/MAGNUM
authorized service center.
Problem
Cause
Solution
