Nothing to do with the pto, early transmissions had a overrunning clutch system that allowed the tractor to freewheel in certain gears when headed down grade, the shifter had red lines on the gear indicator to warn the operator but a person not use to the tractor could experience a runaway condition.
Ford changed the design of the transmission using a direct drive clutch system in the 60's that provided holdback capability in all gears, they then issued a recall to replace to overrunning clutch transmissions but not everyone took their tractors back to the dealers to have the transmissions swapped.
PTO's on SOS tractors were independent with a control handle on the dash shroud to engage and disengage the pto, no clutching needed, the down side was they didn't have a pto brake to stop the pto shaft from rolling while disengaged, to connect or disconnect a implements pro shaft to the tractor the engine had to be shut off.
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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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