Troubleshooting
36
3A8429A
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 25.
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 14.
Debris in paint.
Strain the paint. See page 11.
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. See page 33.
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 authorized
service center.
Problem
Cause
Solution
Summary of Contents for GX21 Cordless
Page 39: ...Notes 3A8429A 39 Notes...
