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Posted on Mar 25, 2009
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D55168 lost compression while running

Runs approx 8 hrs a day

1 Answer

John Trevino

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  • Dewalt Master 1,420 Answers
  • Posted on Mar 25, 2009
John Trevino
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The dewalt model d55168 is a high-end oil-free compressor. Oil free compressors could have a short life span due to dusty or dirty conditions at the job site. The cylinder of your compressor is open from the bottom and will **** in debris scratching the cylinder/ silicone-vinyl piston ring reducing pressure. However the reduction in pressure will be over time till the point that the compressor will not reach cut-out pressure and just keep running. If you lost pressure suddenly to "0" then you probably lost the drive belt. A replacement can be found at a local dewalt service center or ordered thru www.toolpartsdirect.com. When you take down the compressor, be sure to examine the cylinder /piston for wear. These are the two most common problems. Good Luck on your repair and email if you have other questions.

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Related Questions:

1helpful
1answer

Dewalt D55168 225 PSI Air compressor: What are the preset pressure limits for this model? Is it actually 225 - 180?

https://www.manualslib.com/manual/494085/Dewalt-D55168.html

Specifncations
MODEL D55168
WEIGHT 88 Ibs. (39.92 kg)
HEIGHT 41.75" (1060.5mm)
WIDTH 19.0" (4826 mm)
LENGTH 21.25 (539.8 ram)
AIRTANK CAPACITY (GALLONS) 15 Gallon (56.8 fiters)
APPROX CUT-_N PRESSURE 160 PSI (1103.2 kPa)
APPROX. CUT-OUT PRESSURE 200 PSI (1379.0 kPa)
SCFM @ 90 PSI (620.5 kPa_ 5._

cant get fixya comment to work so will edit here...

The 200/160 are the typical DS55168 settings from factory and meet the 90 psi @ 5.4 cfm rating.

Pressures can be adjusted to a MAXIMUM 225/185 with a resulting lower cfm rate.

I'm not familiar with "type 9". Likely nothing special just different setting from factory?
1helpful
1answer

45 lbs. of compression...........good or bad?

If it is still under warrenty then return it for a new one...
Compression should be around 90-110 lb. per sq inch.
Sounds like ring problems, valves, etc.
If it is not under warrenty, time to trash it...because the engine is shot.
Please take time to rate me
Bud
0helpful
1answer

I have a dewalt D55168 air compresser. motor stays running ,air pressure won't go over 35 psi.. thanks , frank n2141s

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.

 

0helpful
1answer

Where is the fuel pump fuse located on a 1992 Oldsmobile 98 Regency? The Olds runs fine except after it's on the road for approx 2 hrs it starts to lose power even if you put the gas pedal to the floor....

hi,
It is under the dash on the passenger side. There are a few fuses and 8 or 9 relays
You have to remove the underside cover to gain access to the electrical panel.

good luck!!!!!
1helpful
1answer

Typical Lifespan

run her till she quits running probally be fine for a long long time keep her squeakey clean okay
0helpful
1answer

Compression rates

Record Mode Recording Size (Resolution) Compression SHQ 1600 x 1200 Approx. 1/2.8 HQ 1600 x 1200 Approx. 1/8 SQ1 1024 x 768 Approx. 1/6 SQ2 640 x 480 Approx. 1/4
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