My compressor will pump up but will not shutoff and will continue to pump until it blows the safety valve then will keep doing this over and over. Would this be the pressure switch?
I experienced the same problem with my DeWalt D55141 compressor. The air leaks when the pressure reaches 80 to 100 psi. I saw a small hole on the outside of the head if you shine a light from the other side of the head. I filled the hole on the outside using epoxy pudding that I bought at a hardware store.
Response #2 Posted By Mark
Hi Donnie and Greg,
The hole on the side of the head should be there. It is a pressure release hole to guard against a bad check valve. If the check valve fails, air from the tank will bleed back to the cylinder. With the tank pressure pushing back on the piston the motor must work much harder and will heat up and fail. The hole must not be blocked. Replacing the check valve should solve the air leak. The check valve is part #D27022 and is available from http://www.ereplacementparts.com.
I hope this helps with your repair!
-Mark
Drain oil Question by Kevin
I've had the DeWalt 55141 compressor for a few years now and I want to change the oil but I've lost the manual. What is the best way to drain the oil and replace the oil with new oil?
My compressor looses air while compressing. This continues after it shuts off. When it tries to restart the pressure on the compressor is too high and the motor stalls. Is this because of a sticking check valve or is there an unloader valve I don't see. Help.
MY COMPRESSOR HAS BEEN RUNNING SLOWLY AND SMOKING SO I TOOK IT APART AND NOTICED QUITE A BIT OF ARCHING FROM THE BRUSHES. THE ARMATURE WAS DIRTY SO I CLEANED IT AND THE BRUSHES TOO. PUT IT BACK AND SAME AMOUNT OF ARCING?
THERE DOESN'T SEEM TO BE ANY SHORTS OR LOOSE WIRES. IS IT POSSIBLE THAT THE ARMATURE IS BAD? WHAT ELSE SHOULD I TRY?
The arching is caused by a shorted out armature. DeWalt does not offer individual parts for the motor on this compressor. You will need to purchase the motor and pump assembly to make the repair. The motor and pump assembly is part #A16342 and is available from http://ereplacementparts.com.
I hope this helps with your repair!
-Mark
compressor is not stoping Question by roger
When the compressor start charging until 120 psi the motor
doesn't stop automatic, just continue working. What is wrong with it?
It sounds like you have a bad pressure switch. The pressure switch is the part that senses when the compressor has filled the tank to a certain pressure at which point it cuts the power to the motor. The pressure switch is part #A05802 and is available from http://ereplacementparts.com.
Good luck with your repair!
-Mark
Air compressor DeWalt D55141 Question by Luis
I have air compressor D55141. This compressor is running and running never make stop, when the valve pressure past 130 the valve safety is open and continued running.
How I can repair and what is the part need replaced?
It sounds like your pressure switch has failed and will need replacing. It is item #312 on page B of the parts diagrams. The pressure switch is part #A05802 and is available from http://ereplacementparts.com.
Good luck with your repair!
-Mark
Power Tool Repair Forum
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