dewalt d55151 type 3 a/c

[wendell]

Compressor runs but will not build pressure above 20 or 25 pounds seems to be blowing back into crankcase

[Mark]

Hi Wendell,

It sounds like your cylinder and piston are worn out. They will need to be replaced. The cylinder is part #5134778-00 and the piston assembly is part #5130102-00. Both parts are available from http://www.ereplacementparts.com.

Good luck with your repair!

-Mark