I bought a old compressor yesterday on Market place.

[pinballlooking]

The pump is two stage rated at 8.8 CFM. Kellogg 321TX
He said it worked 5 years ago time will tell. The wiring needs redone.
I bought it mostly for extra capacity. But now that I see it has a great USA made cast iron pump. I will try to get it running.
I got it for $100 so I am pretty good shape at this point.

If I get it working good I will combine it to have more CFM for sand blasting and a backup for plasma cutting.

[Daox]

Very nice find. I hope the wiring is all it needs.

[pinballlooking]

I drained a couple gallons of water out of it. the I ran fresh water into it until it came out clean.
I put a new pressure gauge on it clean out pressure switch Temp wired the motor.
It fired right up. I have it sitting a 100 psi now for a little while before I see if pressure switch is working.

The exit valve has a slow leak but so far everything is good.

Having a stacker lift sure makes draining much simpler.

I actually had it higher than this where I could just walk under it.

Here it is running.

https://www.youtube.com/watch?v=cpQ8BnVt9tg

It is hard to tell from this clip but it is not very loud.
I have to guard off until I clean it up.

[Daox]

Ha, I was just about to say it seems very quiet! Thats so nice. So many of the newer compressors are so loud...

[pinballlooking]

Now it is not putting out the CFM it should. I am only getting about 2 CFM. I pulled the check valve. I was rusted up and not working very much.
I cleaned it wire brushed/sand paper. Put I very light coat of grease on it. it is working good now. I have 5 CFM now still too low.



The unloader is not working right. I took off the side. The unloader works pretty simple. It has a shaft the presses a Schrader valve that releases pressure on the head so it can restart not under load. There two weights as the compressor spins up the weight move out this pulls in the rod that pushes the Schrader valve. Now pressure is not released on the head and compressor builds pressure.

But the cylinders looked good and the outside bearings look good internals all looked good.

Mine has a bad Schrader valve so it is offloading all the time.
Luckily this part is available. I am going to take off the head to look at the valves.

This compressor has valves that are screwed into the head and needs a special tool to remove them @ $200 I saw where someone made the tool I think I will try to make my own tool. I don’t want to order a part until I know what other parts I need.

I will replace the drain in the bottom and pipe it out the bottom so you can reach it easily.
It needs a new exit valve.

I will clean out the pressure safety switch and maybe the pressure valve.

I think I will hydro test tank with water at 350 PIS
Similar to this guy

But you need to let it sit one hour under pressure.

https://www.youtube.com/watch?v=XE3jGyqquqg

[pinballlooking]

I have the compressor apart. It does not look that bad. The cylinders look great.



The intercooler pipes really need cleaned.


I have a new unloader valve and Head valve rebuild kits coming. $66 shipped.

[pinballlooking]

Originally Posted by Daox

Ha, I was just about to say it seems very quiet! Thats so nice. So many of the newer compressors are so loud...

I have a craftsman 6.5 HP 240 Volt direct drive compressor.
That thing sounds like a air plane taking off. You do not want to be in the garage working while it is running.

I really dislike it and never really use it any more.