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Craftsman air compressor taking forever to fill

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(middletown, md)

I have Craftsman 60 Gal 6.5HP 220V oil less vertical air compressor. It’s about 7 years old. Lately it is taking forever to fill the tank with air and the motor sounds louder than normal. If I let is run it will fill to the desired setting and does not leak once it is full. Any help on this problem would be greatly appreciated.

Thanks in advance

Bill says….

Don’t be surprised if one of these days the compressor pressure level gets to a point and even though the compressor keeps running, the pressure will not build past that point.

There are a number of reasons why this occurs. Visit the TROUBLESHOOTING page, and click the link to the info on why compressors won’t build pressure.

I bet this is your problem, I had it with same model

by: Mike Van Unen

I assume your air filter isn’t clogged up…

The pair of tubes coming out from the head have these little cheap ass rubber cone washers. The head gets way too hot when heavy use for these i.m.o but anyway it is hard to determine this because the fan is blowing so much air on these tube connections anyway,,, and the check valve is shortly downwind from as the tubes go into the checkvalve and then the tank, so the leak stops about instantly when the motor kicks off.

Take off your cover and or shroud.

You could probably feel hot air coming out right around the tubes at head connection.

Take off the compression nuts that hold the tubes in the head. The tubes will come right out.

Best options to fix this are:

1-Figure out a better washer then the cheap ones they come with

2-Order the replacements parts and pay big bucks for cheap ass washers that will take up to weeks to arrive.

3-Go to your local hardware store and get yourself a pair of 3/8″ X 1/2 cone washers. If they have the orange ones, pay the extra 20 cents and get them. They have many names for the same washer in plumbing terms, if in doubt ask for help, tell him you have a 3/8″ supply line that you want to hook to a half inch iron pipe nipple.

Make sure it does NOT have threads in the center, needs to be smooth. Make sure its for 1/2 pipe and not 7/8th toilet ballcock size. Or just look for the biggest hole cone washer available for a 1/2″.

Slide the washer up on the tube where you took the old melted up or missing ones off.

With the new washer and compression nut slide down sever inches, push the tube all the way in the head hole and keep pressing on the tube and slide the rubber cone washer up in the whole with out letting go of the tube you are pushing firmly against the seat in side the head hole outlet.

With your other hand push the nut on the cone washer as your pushing on the tube and turn clockwise until hand tight. Snug it up with a wrench.

Before you put the stuff back together, run it for a little while and watch your pressure gauge. Once it gets up a bit carefully feel around the cone washer tube and nut and feel for air. If it from the fan the air will feel constant, if from the cone washer, it will pulsate.

My unit went from only getting to 60 psi after ten minutes to turning on and getting to the full 120psi in a few short minutes, even though my rings and cyl are not in good shape.

This is the first place to look on oil free units like this as it is the first step in checking the pistons and rings anyway.

Washers about 2- cents.

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By Bill Wade

About Air Compressors has been helping folks with their Air Compressor Problems since 2002 online. We're a community of DIY and Compressed Air professionals who are keen to support everyone across the globe with their air compressor issues and troubleshooting. Whether you're trying to identify an old air compressor, or troubleshoot an error code on a sophisticated new industrial air compressor - the community at About-Air-Compressors.com is here to help you

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