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Compressor motor drags (Slow to get going under a load)The more pressure in tank,the worse it sounds.

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SOUNDS LIKE THE REG IS BAD

Posted on Nov 19, 2009

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Posted on Jan 02, 2017

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On my Kenworth K104 the low air buzzer comes on after only 3 brake applications, the air pressure is set to 850kpa.


Are you draining water from the air tanks. There should be small taps on the bottom of all air tanks. Locate these and open slowly when system is under pressure. Make sure you close them when finished.

Jun 02, 2016 | Cars & Trucks

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I just bought a new craftsman prof 27 gal air compressor. it is oil lubricated. i let it run for 30 mins like the manual said to break it in and then filled the tank. i was putting air in my tires and it...


It sounds like the small valve that releases the pressure out of the main pipe that runs between the compressor and tank is not working once the tank is full and the motor automatically cuts off. You know this valve is working by the sound of a short spurt if air being released when the motor cuts off. Releasing this pressure means that the motor is able to restart easily because there is no load. If the valve is not releasing this air, the compressor is trying to start under full load which the motor is not capable of doing, hence the humming and popping of breakers due to a current overload as the motor tries to start. Motor burnout is possible if it keeps recurring.

This small release valve is attached to the Pressure control switch that switches the motor On & Off and usually has a small pipe going to it or is incorporated inside the Pressure Control Switch. If the valve appears to be working then it means that the Non-return valve on the input to the tank is not sealing properly and letting air back into the main pipe causing the compressor to start under load. Check both valves for correct operation and if not working properly, talk to the people you bought it from to have it repaired under warranty seeing that unit is brand new .

Feb 16, 2011 | Craftsman Air Tools & Compressors

1 Answer

Compressor runs until overload release valve opens (pressure at 130 psi) and then air escapes until pressure lowers to 100 psi..Then motor begins to restart, but will not , due to 100 psi and kicks breaker...


There is a check valve between the compressor and tank, and there is also an 'unloader valve' which blows the pressure off the compressor so that it starts under little load. I think your check valve is stuck open and the unloader valve is blowing tank pressure off.. and when the compressor tries to start it's starting against the pressure in the tank.

So check/replace/thaw the check valve and you'll be good to go. It's generally at the tank where the line from the compressor head goes into the tank, it'll be between the two somewhere.

lp

Jan 02, 2011 | Senco PC2001 2 HP 4 Gallon Electric Hand...

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On start up, the motor ran slow then popped the circuit. plugged it into a 20 amp circuit, it ran a little stronger then shut off without popping the circuit. Motor was hot, and after a short period the...


It sounds like the compressor is trying to start under load because there is a tightness in the pump itself or there is high pressure air in the line between the pump and tank There is a small valve that releases the pressure out of the main pipe that runs between the compressor and tank once the tank is full and the motor automatically cuts off. You know this valve is working by the sound of a short spurt if air being released when the motor cuts off. Releasing this pressure means that the motor is able to restart easily because there is no load. If the valve is not releasing this air, the compressor is trying to start under full load which the motor is not capable of doing, hence the slow running, overheating and popping of breakers due to a current overload as the motor tries to run up to normal peed. Motor burnout is possible if it keeps recurring.

This small release valve is attached to the Pressure control switch that switches the motor On & Off and usually has a small pipe going to it or is incorporated inside the Pressure Control Switch. If the valve appears to be working then it means that the Non-return valve on the input to the tank is not sealing properly and letting air back into the main pipe causing the compressor to start under load. Check both valves for correct operation and replace as necessary.

If all the air side checks out OK the check for low oil level and / or binding in the air pump main drive shaft.

Dec 11, 2010 | Craftsman 33 gal Air Compressor 6 hp...

1 Answer

My compressor will start and run well but when it turns off it will turn but not run stalls and kicks the breaker


It sounds like the small valve that releases the pressure out of the main pipe that runs between the compressor and tank is not working once the tank is full and the motor automatically cuts off. You know this valve is working by the sound of a short spurt if air being released when the motor cuts off. Releasing this pressure means that the motor is able to restart easily because there is no load. If the valve is not releasing this air, the compressor is trying to start under full load which the motor is not capable of doing, hence the humming and popping of breakers due to a current overload as the motor tries to start. Motor burnout is possible if it keeps recurring.
This small release valve is attached to the Pressure control switch that switches the motor On & Off and usually has a small pipe going to it or is incorporated inside the Pressure Control Switch.

Sep 17, 2010 | Porter Cable Cable 20 Gal 150PSI Oil Lube...

1 Answer

A/c starts after it reaches required load it shuts off and when it is suppose to start again it just humms and it trips the circut breaker


It sounds like the small valve that releases the pressure out of the main pipe that runs between the compressor and tank is not working once the tank is full and the motor automatically cuts off. You know this valve is working by the sound of a short spurt if air being released when the motor cuts off. Releasing this pressure means that the motor is able to restart easily because there is no load. If the valve is not releasing this air, the compressor is trying to start under full load which the motor is not capable of doing, hence the humming and popping of breakers due to a current overload as the motor tries to start. Motor burnout is possible if it keeps recurring.

This small release valve is attached to the Pressure control switch that switches the motor On & Off and usually has a small pipe going to it or is incorporated inside the Pressure Control Switch. If the valve appears to be working then it means that the Non-return valve on the input to the tank is not sealing properly and letting air back into the main pipe causing the compressor to start under load. Check both valves for correct operation and replace as necessary.

Sep 15, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Cdewalt d55133 compressor. compresor fill air tank but when engine try to start again humms and the breaker come on and wont start


It sounds like the valve that releases the pressure out of the pipe that runs between the compressor and tank is not working once the tank is full and the motor automatically cuts off. This valve is attached to the Pressure control switch that switches the motor On & Off and usually has a small pipe going to it. You know the valve is working by the sound of a short spurt if air being released when the motor cuts off. If the valve is not releasing this air the compressor is trying to start under full load which the motor is not capable of doing, hence the humming and popping of breakers due to a current overload as the motor tries to start.

Aug 25, 2010 | Garden

1 Answer

2 hp 120 v motor on compressor. motor will not start under load


bleeder valve is bad or dirty drain air unplug machine pull the back up plate control plate and make it shinny with emmeory cloth then clen it and try again, if it still does the same thing your going to nedd to replace unloader valve.

Apr 14, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Compressor sounds like it's running under a large load and really slow. Blows circuit breaker eventually.


There is a line running from the pump assembly to the tank. At the tank the compressed air passes a check valve. This valve prevents the air from escaping back along the same line. After the tank reaches max psi the motor shuts off. What is undoubtedly happening or rather not happening with your compressor is the unloader valve is not functioning properly.

The unloader valve is what bleeds off the pressure that remain in the compression chamber after the motor shut off. If the unloader valve fails to bleed the excess psi off then the piston has to work against your minimum psi. or around 80psi.

This is your large load.
The unloader valve is comprised of a mechanical trigger at the switch and a small air line that runs from the switch back to the tank check valve or up at the pump manifold.

Often it is enough to clean the small mechanism and make sure all the small parts are free from corrosion or damage.
However you may need to replace it.
Hope this helps.

Nov 25, 2009 | Air Tools & Compressors

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