Question about Dewalt D55168 1.8 HP Wheeled Portable Electric Workshop Compressor

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Dewalt D55168 won't build pressure beyond 125 psi, motor runs continually

It has run perfectly for a year and a half. Started it up today and it won't build pressure beyond 125 psi. Checked for leaks and found none.

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  • 142 Answers

Worn ring and cylinder or bad valves maybe.

Posted on Jan 04, 2013

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Posted on Jan 02, 2017

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mxc2
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SOURCE: I have a dewalt D55168 air compresser. motor stays

Here is a parts diagram for the air compressor:

http://shoppingcart.msservicecompany.com/msservice_net/product_files/D55168/D55168_PL.pdf

 

There are a couple of things to look for on the air compressor.

You will need to see if the piston ring is damaged or if you have a broken reed on the valve plate.

 

These are typically the two most common problems with this model.

 

Posted on Oct 13, 2010

  • 885 Answers

SOURCE: I have a D55168 Dewalt

Your concern is very well placed, at pressures that high a lot of damage can be caused by a failure. According to the manual for this model air compressor the approximate cut-in pressure is 160 psi and the approximate cut-out pressure is 200 psi. Meaning it should pump up to 'about' 200 psi and shut off and not come on again until it gets down to 'about' 160 psi. They say approximate and I say about because it's not an exact science setting the pressure switch. Spring rates are not always exact, pressure guages are not that precise, etc. When turned on, it should shut off at 200 psi +/- 10 lbs. If it goes more than 10 lbs over that (220psi), I'd recommend you get the pressure switch and or guages checked or replaced.

Posted on Jun 16, 2011

  • 142 Answers

SOURCE: Dewalt D55168 air compressor runs until 95 psi and

If you have no leaks the first thing I'd check is the ring and cylinder for wear. The cylinder wear is usually pretty obvious, but if you can see light around the piston ring it's bad. The replacement part number is N038785. Also check to make sure no valves on the valve plate part number A09819 are broken or bent.

Posted on Dec 16, 2011

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Please take time to rate me
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If correct then it will suck you hand against the intake.
If the valve or valves have failed then you will feel the air sucking in and blowing out.


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Pressure Switch...Check for air leaks at the pressure switch, it has a rubber diaphram that can fail and leak air out of the system.
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*Air Leaks..Place your ear close to the compressor and listen for air leaking, if you hear air that is not normal and means you have to locate and repair whatever it is that is leaking.
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