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Problem
Sprayer runs, but pump does not
prime or looses prime while in
use.
(Pump cycles but does not pump
paint or build pressure.)
3A8429B
Cause
Inlet valve check ball is stuck.
Prime/Spray Valve is in SPRAY
position.
Pump was not primed with
flushing fluid.
(Thick fluids may not prime if not
initially primed with flushing
fluid.)
Debris in paint.
Thick or "sticky" paint.
Inlet strainer is clogged or
suction tube is not immersed in
paint.
Inlet valve check ball or seat is
dirty.
Suction tube is leaking.
Outlet valve check ball is stuck.
Prime/Spray Valve is worn or
obstructed with debris.
Troubleshooting
Solution
Press PushPrime button to
dislodge the ball allowing pump
to prime properly, OR Power
Flush sprayer, see page 27.
Turn Prime/Spray Valve down to
PRIME position until paint exits
drain tube. The pump is now
primed.
Remove suction tube from paint.
Prime pump with oil or
water-based flushing fluid. See
page 15.
Strain the paint. See page 12.
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.
Clean debris off inlet strainer and
make sure suction tube is
immersed in paint.
Remove inlet fitting. Clean or
replace ball and seat. See page
36.
Inspect suction tube connection
for cracks or vacuum leaks.
Unscrew outlet valve, remove,
and clean assembly.
See Pump Repair, page 35.
Then reprime pump.
Remove inlet and/or outlet
valves and clean, replace and
reprime. See Fill Pump, page
18.
Make certain to not lose the
ball and spring of the inlet
valve assembly or the sprayer
will not function. See Inlet
Valve Removal, page 36.
Make certain the outlet ball
moves free in the housing
before replacing.
Take sprayer to Graco
authorized service center.
39
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