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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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