Thanks for the post Bobby,

Most likely the Connecting Rods are frozen to the Crankshaft journals, so this is the number one problem you'll probably encounter when you disassemble the pump.
If this is the case then you can purchase the Conrods for about $33 each. You'll probably have to polish aluminum deposits left on the Crank journals from the frozen rods first, then install the new Rods.

You can find a full breakdown of this pump and a parts list at the below link:

www.mastertoolrepair.com/air-compressor-...t203003-p-17665.html

As for the scrubbing sound you're hearing at a certain point in the rotation of the pump, this is most likely an End Cap Bearing that is possibly seized, or is seizing, when it reaches a certain point in the rotation due to the lack of oil.
You'll be able to tell once you remove the End Cap and rotate the Bearing by hand to see if it's seizing or not.

But essentially, the problem will most likely be frozen Rods.

- MTR

Good to see you found the problem. You're right, these are "free-floating" rods which Campbell Hausfeld started using in recent years, so no rod bolts, caps or inserts.

Yes, you'll want to press the bearing on the crank, and if you don't have a press then you can always use a large socket the same diameter as the inner race of the bearing and take a mallet to it.

Hope this helps!

- MTR

Glad to do it Bobby, and good luck!

- MTR