Milwaukee M4910-20 Pressure setting is too low, and Motor, Seems to be running properly but

troubleshooting

Problem	Cause	Possible Solution
Pump does not prime	Prime/Spray valve is in Spray position	Turn Prime/Spray lever to Prime
	Inlet screen is clogged or intake tube is not	Clean debris off inlet screen and make
	immersed	sure intake tube is at bottom of paint
		bucket
	Inlet valve check ball is stuck	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.
	Intake tube is loose	Tighten intake tube with flat-head
		screwdriver
Motor seems to be running	Reversible spray tip is worn	Replace spray tip
properly but pressure drops when	Spray tip is clogged	Turn spray tip 180° and spray to clean
pistol-grip sprayer is triggered	Suction tube and filter are loose or	Reinstall or replace suction tube and
	damaged	filter as needed
	Pistol-grip sprayer filter is clogged	Clean or replace pistol-grip sprayer
	Material being sprayed is too thick	filter
		Follow material manufacturer’s directions
	Inlet valve is damaged or worn	and thin material as needed
		Replace inlet valve
	Intake tube is loose
		Tighten intake tube
Prime/spray lever is set to spray	Prime/spray lever is dirty or damaged	Contact Authorized Service Center
but there is flow through the prime
tube
Pistol-grip sprayer leaks	Internal sprayer parts are worn or	Contact Authorized Service Center
	damaged
Nozzle tip guard leaks	Nozzle tip guard or spray tip were assembled	Reassemble according to nozzle tip guard
	improperly	and Spray tip assembly instructions
Pistol-grip sprayer will not spray	Spray tip is clogged	Turn spray tip 180° and spray to clean
	Pistol-grip sprayer filter is clogged	Clean or replace pistol-grip sprayer
	Spray tip is not fully seated into nozzle tip	filter
	guard	Reassemble according to nozzle tip guard
		and Spray tip assembly instructions
Paint pattern is weak or uneven	Pressure is set too low	Turn variable pressure control to a higher
		setting
	Pistol-grip sprayer or intake tube filter is	Clean or replace filters
	clogged
	Intake tube is loose at inlet valve	Tighten tube fitting
	Spray tip is worn	Replace spray tip
	Material being sprayed is too thick	Follow material manufacturer’s directions
		and thin material as needed
	Loss of pressure	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

14 — English