A hybrid system, consisting of an internal combustion engine (1) with added-on and/or integrated hydraulic pumps (2) to supply consumers (5) and/or the drive unit (12), at least one engine control unit (3) for electronic engine regulation and/or fuel-injection regulation, at least one hydraulic control unit (4) to control at least one hydraulic consumer (5), at least one pressure sustaining valve (6), at least one reversing valve (7) and at least one hydraulic pressure accumulator (8).