Graco Magnum L10 Repair Manual page 16

Basic Troubleshooting
Problem
Pump does not prime.
16
Cause
Prime/Spray Valve is in SPRAY posi-
tion.
Inlet screen is clogged or suction
tube is not immersed in fluid.
Pump was not primed with flushing
fluid.
Inlet valve check ball is stuck.
Inlet valve check ball or seat is dirty
or worn.
Outlet valve check ball is stuck or
worn.
Suction tube is leaking.
Pump does not prime with fluid.
Fluids are viscous or sticky.
Solution
Move Prime/Spray Valve to PRIME
position.
Clean debris off inlet screen and
make sure suction tube is immersed
in fluid.
Remove suction tube from paint.
Prime pump with water or sol-
vent-based flushing fluid, see Opera-
tion manual.
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.
L30+: AutoPrime may need replace-
ment. Turn power switch ON and lis-
ten for "tap" in pump. If you do not
hear "tap", AutoPrime is damaged.
Take sprayer to Graco/M
authorized service center.
Remove inlet fitting. Clean or replace
ball and seat.
L30+: 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.
M5, L10, M3+, M5+, and L10+:
Remove outlet fitting and clean outlet
check ball. Replace if worn.
Tighten suction tube connection.
Inspect for cracks or vacuum leaks.
Remove suction tube from paint.
Prime pump with water or sol-
vent-based flushing fluid.
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.
AGNUM
332642C