Sandvik has released a new Up-box for Sandvik TH551, TH551i, TH663 and TH663i dump trucks.
In the new improved up-box the weight of gears has been optimized in order to reduce inertia values. Gear teeth width has changed from 60mm to 43mm.
This improvement, associated with the Improved Flexible Coupling (see next page), will help to reduce the torsional vibration in the rest of the power train, which improves the lifetime of the power train components.
This modification is only possible on Volvo powered trucks.