A MD will have a belly pump, and a 400 will have an engine mounted pump in front of the distributor. If we discuss a SMD it might (I think) have a belly pump if stage 1, or a engine pump if stage 2 (later production).The SMD stage 2 engine pump is the same as 400 SMTAD, and 450. all Diesel engine pumps rotate backwards from the gas engine models and are not interchangeable with a gas tractor. Jim
 

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