Sliding bearings are used as rotating support of high-loaded transport vehicles gearwheels sliding. Design of such units stipulates two basic operational modes for bearings: sliding mode (without transfer of load) and slip rolling (during transfer of load). Technical characteristics of gearwheels bearings determine the modes of gearing and i.e. make it possible to provide reliability of transport vehicles power transmissions in whole. Slip rolling (during transfer of load) mode of bearings hasn’t been studied yet, thus it’s impossible to assess the influence of transport vehicles operational conditions on its wear. To determine the design and operational factors influence on tension-distortion state of sliding bearings material there were provided testing on developed for this purpose by the researchers stand. Gained results made it possible to determine the influence of bearing clearance, viscosity and temperature of oil supplied, rotation frequency, radial load and pressure on bearing unit material distribution. There were experimentally proved, that temperature of oil supplied and speed of unit rocking don’t influence on bearing around the diameter pressure distribution for two equal load conditions while using lubricating material of the same viscosity (SAE 30). Besides, the use of different viscosity oils also doesn’t influence sufficiently on maximal tension readings in high-load bearings. Increase of relative gap in bearing for 45% entailed raise of maximal load on bearing on the average for 50%, and further increase of clearance 3,75 times led to 2,5 times load raise on bearing. There was found, that decrease of average assembly clearance for 0,025mm, average wear reading (with 8 thousand hours running period) decreases up to 40%. Got by the authors statistical data of bearing unit wear during operation and stand testing make it possible to assume probability of its trouble-free operation in case of different readings of assembly and limit clearances values. This enabled to manage the reliability indicators of high-loaded transport vehicles power transmissions without changing of bearing unit design and its operational conditions. Eventually there was offered an algorithm for reliability indicators management on stages of bearing units assembly, which make it possible to increase their trouble-free operation in cases of different designs.