Therefore, the front pump handles everything EXCEPT the hitch; it supplies oil for steering, remotes and lube. Rear (piggyback) pump handles the hitch only under normal operation. That's why it is called the hitch pump. :>)
However, under full system demand, and IF the hitch isn't being used (or has arrived at the end of the hitch piston's travel), the rear pump can/will assist the front pump in it's duties.
But, not the other way around.
So, if yer hitch isn't working right, (everything else is okay) suspect the rear pump. Especially so, since we're talking a tractor that old.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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