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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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