Gearboxes can be put into operation in the following conditions:

permanent and alternating load of one direction in the limits of nominal torque;

long-term operation (up to 24 hours per day) or with periodical stops;

shaft rotation in any direction without preference, except gearboxes of KTst type;

input shaft rotational speed - n=750-1500 rpm;

different climatic constructions.
Nominal torques of gearboxes are given in table for constant mode of operation (duration of switching on the PV - 100%).
While gearboxes operate in reverse mode, i.e. the periodical change of rotation direction, except gearboxes of KTst type, the nominal torque at the output shaft decreases to 25%.
The oil-bath circulating and stream non-circulating flow lubrication system shall be provided for gearboxes.
The gearboxes can have different constructions, providing:

cylindrical and conical ends of input and output shafts;

low-speed shaft in the form of tooth-type coupling;

hollow shaft with keyed joint;

different variants of gearbox fastening.