No. The head and rotor for Stanadyne/Roosamaster series pumps differs by the number of cylinders in the engine it powers. Also, it differs by the diameter of the pump-plungers, and the number of plungers.
Usually, if two pumps ran engines with the same amount of cylinders, and both pumps have the same sized plunger, then you can swap.
DB pump, or JDB, on a Deere can be 3, 4, or 6 cylinder. Also, the model number tag will tell you the diameter of the pump plungers.
For example, a pump from a 350 Deere crawler and/or 1020 farm tractor is: JDB331AL2732
That means - J for "John Deere", DB for "die-cast B model pump", 3 for "three cylinder engine", 31 for .31" diameter pump plungers, etc. etc.
All DB pumps and DB2 pumps are two-plunger pumps. DB4 pumps and DC pumps have four plungers.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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