When you correct the fault with the unharnessed oscillating crank, this falls into the neutral position.
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Depending on context (I'm assuming its something technical) you could also have 'rocker arm'; 'motion link' instead of "oscillating crank" Or also see below for itsatrap100 's suggestion for 'freigesetzte Schwinge'
I translated *freigesetzt* as "unharnessed", but it could also mean 'redundant'
** thanks to gbernsdorff for suggesting a different meaning for 'Leerstellung'
I think that *Leerstellung* is the neutral position (point mort) of a mechanical device.
(by analogy with *in den Leerlauf schalten* = mettre le moteur au point mort/put the engine out of gear)