The "D" stands for "die-cast." The "B" is the basic pump model/generation.
Roosa invented the distributor pump in 1947. First models were sand-cast housings and called "Model A."
Model A pumps were made until 1956. Then production of the model B and D pumps began. Model B still used sand-cast housings and model D used die-cast housings.
In 1953, CAV purchased rights to copy the American "Roosa" pump and make their own version for use in the rest of the world.
For a long time there was an agreement that American equipment used Roosamaster and never CAV when sold in the USA. Obviously that deal ended at some point.
John Deere - as I recall - was the 2nd tractor company to use the Roosa rotary-distributor die-cast pump. That was on the 1960 1010. I think Hercules was the first to use it.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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