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Repair: • Repair of the ZF S 6-80 gearbox getriebe reparat... PART 1. Repair of the gearbox (gear shift box) ZF S6-80. The box was removed due to extraneous noise during operation (knocking). During disassembly it turned out that there was no oil in the box!!! It worked without lubrication, as a result of which the parts of the synchronizer of 5-6 gears were welded to each other.