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 - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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