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Air compressor slow to build air pressure.

Black & Decker air compressor bdc4g type1 (200613 - AC) is too slow building pressure

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You might need to checktosee if the filter is blocked or dirty were the air intake is just like a car dirt can build up there.

Posted on May 26, 2009

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Dewalt Emglo 55168 motor starts to slow down as pressure builds to about 30 PSI. It really starts to labor. Any thoughts as to what could be causing the motor to strain and slow?


Most likely in tank check valve is leaking or belt is slipping. Belt tension easy to check, should not deflect with thumb pressure. Check valve should not let air escape out of tank. Easy to check. Run compressor till pressure builds to around 50 psi. Then unplug machine from power outlet. Listen for air leaking out of tank. In bad cases, air will actually leak out of intake filter. Replace check valve as needed. Good luck

Oct 26, 2016 | Dewalt Air Tools & Compressors

1 Answer

Air compressor slow to build pressure, and noisy.


All large air compressors are very noisy.

How long it takes to come up to pressure depends on the size of the compressor piston(s), how fast they are running and the size of the air tank attached to it. (and if the tank or hoses have leaks)
A 20 gallon tank could easily take 10 minutes to get all the way up to 120 psi. 120 is very high, and probably the limit for the compressor. Depending on what you're using it for, try dropping the setting to say 80-90psi.

Sep 25, 2012 | Air Tools & Compressors

1 Answer

My compressor keeps slowly building air after it has reached cut out pressure of 170 , keeps building till it reaches 200 and high pressure valve opens ....


It is not opening the bypass valve all the way see if there is a adjustment so that it pushes the valve open farther when it slows down.

Mar 19, 2011 | Honda Air Tools & Compressors

1 Answer

Won't build air pressure & piston rings seem to be ok


Did you inspect lp and hp valves. I would take a close look at the HP valves first,typically bad Lp valves will cause it to build pressure very slowly.

Jan 31, 2011 | Ingersoll Rand 2340/2475 Electric Air...

3 Answers

I have a dewalt D55155 compressor that has not been used in three years. It starts and builds pressure, but does not charge the air hose. Ant thoughts?


have you turned up the regulator, the big black know by the output fitting

You may have to open andclose it a few times cuz it may have trash or be stuck

Nov 04, 2009 | Black & Decker Dewalt #D55155 2HP 4GAL...

1 Answer

While running to build pressure it slows down then speeds up


hi buddy can be the valves sticking try squirting oil in the air filter and get back to me

Sep 19, 2009 | Air Tools & Compressors

1 Answer

Compressor will not build pressure


It sounds like it is not getting enough electricity.
Try plugging in to an outlet on its own circuit without an extension cord. make sure the circuit is rated for your air compressor. If it is on a circuit with other appliances, refrigerator, lights, ect. try shutting them all off before turning on the air compressor.


Good luck

Aug 04, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

Exhaust fan running slow


sounds like the compressor is turning off cause of high pressure. check the coil that the exhaust hose connects to, if dirty clean it. if the fan is not blowing enough air threw the coil the unit will build up high side pressure and cut out, but will turn back on when pressure drops. if that dont help, maybe the fan motor is bad or needs taken apart and oiled.

May 31, 2009 | Maytag Portable Air Conditioner M6P09S2A

1 Answer

Air compressor fills, but slows down as the pressure builds


sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you

Mar 22, 2009 | Campbell Hausfeld Air Tools & Compressors

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