Lang,
I just had a look at the AEC Matador manual, and the winch overload mechanism is quite interesting. It works on the strain exerted on the winch cable rollers, rather than the winch itself, and as Maurice said, a rod mechanism connects the mechanism attached to the rollers to the engine injector pump, moving it to the engine stop position when the strain gets close to the maximum winch capacity.
There were two capacity winches: early model Matadors had a 3 ton (straight pull) winch, which was soon superseded by a 7 ton (straight pull) winch.
Mike
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