Does anyone know what type of concrete pump this could be? It has a CAT Diesel engine but no other manufacturer markings or stickers. I can't even find the serial or model numbers. The only pumps that I could find that have CAT Diesel engines are Schwings. Those are all white but this one is the yellow Reed pump color.

Can you put up some photo's?

I think Reed also switched over to cat motor (Perkins) 

Nope, no Cats here at REED - Perkins on our A Series pumps and CUMMINS on B & C Series.

Agreed...photos would probably help us solve the mystery

i ran an old pumpit made by allentown neumatics made in pennsylvania

yeah that was in 1981 and it was yellow too

have you got a picture

I have seen a few old whitemans with cat engines that were painted yellow