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Troubleshooting
313034A 27
Pump does not prime. Prime/Spray Valve is in SPRAY
position.
Turn Prime/Spray Valve to PRIME
position (pointing down).
Inlet screen is clogged or suction
tube is not immersed.
Clean debris off inlet screen and
make sure suction tube is
immersed in fluid.
Pump was not primed with
flushing fluid.
Remove suction tube from paint.
Prime pump with water or
solvent-based flushing fluid, page
10.
Inlet valve check ball is stuck. Remove suction tube and place a
pencil into the inlet section to dis-
lodge the ball, allowing pump to
prime properly. OR Power Flush
sprayer, page 19.
AutoPrime may need replace-
ment. Turn power switch ON and
listen for “tap” in pump. If you do
not hear “tap”, AutoPrime is dam-
aged. Take sprayer to Graco/M
AG-
NUM authorized service center.
Inlet valve check ball or seat is
dirty
Remove inlet fitting. Clean or
replace ball and seat.
Outlet valve check ball is stuck. ProLTS 17 and ProLTS 19: Insert
screw driver in slot and remove
Easy-Access
™
door, page 7.
Unscrew outlet valve with a 3/4 in.
socket. Remove and clean
assembly.
LTS 15 and LTS 17: Remove out-
let fitting and clean outlet check
ball.
Suction tube is leaking. Tighten suction tube connection.
Inspect for cracks or vacuum
leaks.
Pump does not prime with fluid. Remove suction tube from paint.
Prime pump with water or sol-
vent-based flushing fluid.
Problem Cause Solution