Troubleshooting - Milwaukee M4910-20 Operator's Manual

PROBLEM
Pump does not prime
Motor seems to be running
properly but pressure drops when
pistol-grip sprayer is triggered
Prime/spray lever is set to spray
but there is flow through the prime
tube
Pistol-grip sprayer leaks
Nozzle tip guard leaks
Pistol-grip sprayer will not spray
Paint pattern is weak or uneven

TROUBLESHOOTING

CAUSE
Prime/Spray valve is in Spray position
Inlet screen is clogged or intake tube is not
immersed
Inlet valve check ball is stuck
Intake tube is loose
Reversible spray tip is worn
Spray tip is clogged
Suction tube and filter are loose or
damaged
Pistol-grip sprayer filter is clogged
Material being sprayed is too thick
Inlet valve is damaged or worn
Intake tube is loose
PRIME/SPRAY lever is dirty or damaged
Internal sprayer parts are worn or
damaged
Nozzle tip guard or spray tip were assembled
improperly
Spray tip is clogged
Pistol-grip sprayer filter is clogged
Spray tip is not fully seated into nozzle tip
guard
Pressure is set too low
Pistol-grip sprayer or intake tube filter is
clogged
Intake tube is loose at inlet valve
Spray tip is worn
Material being sprayed is too thick
Loss of pressure
14 — English
POSSIBLE SOLUTION
Turn Prime/Spray lever to Prime
Clean debris off inlet screen and make
sure intake tube is at bottom of paint
bucket
Tap firmly on the outside of the inlet valve
with a small wrench, allowing pump to
prime properly
Remove intake tube and place a pencil
into the inlet section to dislodge the ball,
allowing pump to prime properly.
Tighten intake tube with flat-head
screwdriver
Replace spray tip
Turn spray tip 180° and spray to clean
Reinstall or replace suction tube and
filter as needed
Clean or replace pistol-grip sprayer
filter
Follow material manufacturer's directions
and thin material as needed
Replace inlet valve
Tighten intake tube
Contact Authorized Service Center
Contact Authorized Service Center
Reassemble according to nozzle tip guard
and Spray tip assembly instructions
Turn spray tip 180° and spray to clean
Clean or replace pistol-grip sprayer
filter
Reassemble according to nozzle tip guard
and Spray tip assembly instructions
Turn variable pressure control to a higher
setting
Clean or replace filters
Tighten tube fitting
Replace spray tip
Follow material manufacturer's directions
and thin material as needed
See Cause/Possible solutions for
Pressure setting is too low, and Motor
seems to be running properly but
pressure drops when pistol-grip is
triggered