A CST gearbox comes in three parts: a supply unit, a first planetary gear stage and an output unit comprising a second planetary gear stage. The KP gearbox also comes in three parts. The supply unit and output unit are the same as the ones from the P gearbox, but the first planetary gear stage is replaced by a bevel helical gearbox unit. The KP gearbox design is available in a left-handed and in a right-handed version. It is also possible to mount the electro-hydraulic controller either inside or outside the supply unit.

The roller bearings of the bevel gear shaft are lubricated by forced lubrication via the built-in oil pump (usually responsible for cooling oil supply to the CST clutch). All other gearings and roller bearings are lubricated by means of splash lubrication.

Reduction ratios of 33:1, 39:1 and 50:1 are available. In addition to the standard CST65 gearbox, we offer the CST65 S gearbox. The S version comes with a sideways mounted electro-hydraulic controller, an extra lube oil filter and two independent cooling circuits (including separate heat exchangers) instead of one.

Depending on the particular ratio, the permissible input power of the gearbox can be up to 1200 kW/1,632 hp at a mains frequency of 50 Hz ( ≈ 1,485 rpm) or 1440 kW/1,958 hp at a mains frequency of 60 Hz (≈ 1,782 rpm). The permissible output torque is 650,000 Nm (max for 3 seconds). The rated continuous output torque is 255,000 (i=33).