Many fixed displacement gear pumps are used in open center systems. Ford did a lot of that over the years with smaller tractors.
What Jim is talking about... is technically classed as an open center load sensing system as it used fixed displacement gear pumps and an unloading valve. However... all spool valving beyond the load sense valve WAS Closed Center Load Sensing (CCLS). They used the same CCLS remotes as would have been used on modern Pressure Flow Compensated (PFC) hydraulic systems that is standard on all larger tractors today.
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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 "Replaced by" means the part was superseded.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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