Troubleshooting Guide

Troubleshooting
3A3208B 33
Sprayer runs, but pump does not
prime or looses prime while in use.
(Pump cycles but does not pump
paint or build pressure.)
Inlet valve check ball is stuck. Press PushPrime button to dislodge
the ball allowing pump to prime
properly, OR Power Flush sprayer,
see page 20.
Prime/Spray valve is in SPRAY
position.
Turn Prime/Spray valve down to
PRIME position until paint exits drain
tube. The pump is now primed.
Pump was not primed with flushing
fluid.
(Thick fluids may not prime if not
initially primed with flushing fluid.)
Remove suction tube from paint.
Prime pump with oil or water-based
flushing fluid. See page 26.
Debris in paint. Strain the paint. See page 12.
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.
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 check ball or seat is dirty. Remove inlet fitting. Clean or replace
ball and seat. ProX only: See page
30.
Suction tube is leaking. Inspect suction tube connection for
cracks or vacuum leaks.
Outlet valve check ball is stuck. Unscrew outlet valve, remove, and
clean assembly.
Prime/Spray valve is worn or
obstructed with debris.
Take sprayer to Graco/MAGNUM
authorized service center.
Problem Cause Solution