Basic Troubleshooting
16 332695C
Pump does not prime. Prime/Spray Valve is in SPRAY posi-
tion.
Move Prime/Spray Valve to PRIME
position.
Inlet screen is clogged or suction
tube is not immersed in fluid.
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 sol-
vent-based flushing fluid, see Opera-
tion manual.
Inlet valve check ball is stuck. Remove suction tube and place a
pencil into the inlet section to dis-
lodge the ball, press pump priming
button, or Power Flush sprayer. See
Operation manual.
ProLTS 19: AutoPrime may need
replacement. 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
or worn.
Remove inlet fitting. Clean or replace
ball and seat.
Outlet valve check ball is stuck or
worn.
ProLTS 19: Insert screw driver in
slot and remove Easy-Access™
door, page 11. Unscrew outlet valve
with a 3/4 in. socket. Remove and
clean assembly. Replace if worn.
LTS 15 and LTS 17: Remove outlet
fitting and clean outlet check ball.
Replace if worn.
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.
Fluids are viscous or sticky. Some fluids may prime faster if the
Power Switch is momentarily turned
off so the pump can slow and stop.
Repeat several times if necessary.
Problem Cause Solution
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