Graco LTS 15, Repair And Parts Manual

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Basic Troubleshooting
313036N 15
Pump cycles but does not build up
pressure. Prime/Spray valve in PRIME posi-
tion (pointing down). Turn Prime/Spray valve to SPRAY
position (pointing forward).
Pump is not primed. Prime pump, see Operation manual
313034.
Inlet screen is clogged or suction
tube is not immersed. Clean debris off inlet screen and
make sure suction tube is immersed
in fluid.
Suction tube is leaking, allowing air
to enter. Check suction tube for cracks and
cuts. Make sure suction tube clamp
is on hose. Replace suction tube if
cracked or damaged.
Prime/Spray Valve is worn or
obstructed with debris. Take sprayer to Graco/M
AGNUM
authorized service center.
Pump check ball is stuck. Read Pump does not prime sec-
tion in Troubleshooting, page 14.
Pump cycles, but paint only dribbles
or spurts when spray gun is trig-
gered. Pressure is set too low. Slowly turn pressure control knob
clockwise to increase pressure set-
ting which will turn motor on to build
pressure.
Spray tip is clogged. Unclog spray tip, see Operation
manual 313034.
InstaClean fluid filter is clogged.
(ProLTS 17 and ProLTS 19 Only)
Clean or replace InstaClean fluid fil-
ter, see Operation manual 313034.
Spray gun fluid filter is clogged. Clean or replace gun fluid filter, see
Operation manual 313034.
Spray tip is too large or worn. Replace tip.
Problem Cause Solution