I have aquired an **OLD** Thomsen mechanical ball vlave pump, it is based on the Mayco C30. The unit is kind of backwards....than the Mayco, and has a gear box up top. The pump is  in great conditoion and I am almost done rebuilding it but I do not know what model it is. I cannot find any literature. Most of the wear parts are the same as the Mayco but I cannot find the ball valve seats as they are not the same as the Mayco. Is there anyone familiar with this unit? Any info would be helpful.

Call 416-749-2843 and ask for Nathan.   If there's something available he will figure it out.  There's a bunch of clones of those machines out there and parts from one of them is bound to fit.   They might even be in stock.   

Thanks!! I will call him.

Most likely you have a Thomsen 260.  Hopper was on the opposite side when compared to a Mayco C30.  Is the hopper on a hinge for easy access?

Yes it is hinged. I added pictures. Any chance anyone has a parts manual for this?

That is definitely a Thomsen 260.

I know I have the original brochure and Ops Manual.  Not sure if I still have a parts book.

Call Dan DeFrange at PM West location.  He can tell you what parts are still available.  He has all the original drawings.

Airplaco made a near identical knockoff of the 260 until recently.  They may have parts that cross too.

Nathan is the man!!! He found someone with a parts manual and sent me a scan. Now if I can get the seats I will be in business.