Graco LTS 15, Repair And Parts Manual

Page: 14 / 54

Basic Troubleshooting
14 313036N
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 sol-
vent-based flushing fluid, see Oper-
ation manual 313034.
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, see Operation manual
313034.
AutoPrime may need replacement.
Turn power switch ON and listen for
“tap” in pump. If you do not hear
“tap”, AutoPrime is damaged. Take
sprayer to Graco/M
AGNUM
autho-
rized 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 8.
Unscrew outlet valve with a 3/4 in.
socket. Remove and clean assem-
bly.
LTS 15 and LTS 17: Remove outlet
fitting and clean outlet check ball.
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.
Pump valves are worn.
Check for worn pump valves.
a. Prime sprayer with paint
b. Trigger gun momentarily.
When trigger is released,
pump should cycle momen-
tarily and stop. If pump con-
tinues to cycle, pump valves
may be worn.
Paint is very thick or tacky. Thin material per manufacturer
recommendations.
Momentarily turn power switch OFF
to allow pump to slow and stop.
Repeat as necessary.
Problem Cause Solution