Dewalt D55146 compressor builds pressure very slowly.

by Ray H
(wenatchee Wa)

D55146 1.6 HP Continuous, 200 PSI, 4.5 Gallon Compressor

D55146 1.6 HP Continuous, 200 PSI, 4.5 Gallon Compressor

Hello and thanks for taking my question.I have a dewalt D15546 4.5 gallon 1.8hp air compressor. Its only three years old and has had very little use the last two years. it now takes forever to build to shut off pressure of 212 lbs (45 minutes or more) and sometimes wont even build to that pressure. after about 150 lbs it just seems to slow way down but just keeps running. I have done all the troubleshooting tips that you have suggested on this site and everything looks just fine. I isolated the power source, took the head off and checked the reeds, they looked fine. it has metal fingers on the reeds no corrosion no broken fingers. what else could be the problem? thanks much Ray

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Nov 23, 2014
pressure switch
by: Doug in s.d.ca

Couple of points, during or after what Bill said:

That's supposed to be 200PSI MAX. So, you should look to see if its pressure switch is adjustable, and set it to cut out at 200, not 212PSI.

Second, that high pressure could have contributed to accelerated wear of the piston ring(s), which would slow down the pressure build time.

Nov 23, 2014
D55146 1.6 HP Continuous, 200 PSI, 4.5 Gallon Compressor
by: Bill

The air intake to the pump is clear I expect?

Next thing I'd check is the line that enters the tank, Ray to be sure that the check valve itself isn't the problem. Make sure the tank is empty before you break that connection, of course.

After that, if still no relief on your D55146 1.6 HP Continuous, 200 PSI, 4.5 Gallon Compressor, I'd be checking the run capacitor. See the page on this site for that.

Bill

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