1. The device in a forestry machine (100), the device comprising: a chassis (12), a uniaxial set of rollers (13) pivotally attached to the chassis (12), and at least one auxiliary roller (18) installed outside the set of rollers ( 13) in order to increase the load capacity of the rear part (19) of the chassis (12), characterized in that the device further comprises at least one support arm (20) configured to support said auxiliary roller (18) at its first end (22) ) and pivotally attached at its second end ( 24) to the specified chassis (12) using a transverse shaft (23), a support surface (36) attached to the chassis (12) and an opposite surface (38) attached to the specified support arm (20) to limit the lateral movement of the support arm ( 20) .2. A device according to claim 1, characterized in that said uniaxial set of rollers (13) is a set of track rollers (11) pivotally attached to the chassis (12) using a swivel trolley (14) .3. A device according to claim 2, characterized in that said set of track rollers (11) comprises at least two pairs of track rollers (16 ', 17'). A device according to claim 1, characterized in that said set of track rollers (11) is leading. A device according to claim 1, characterized in that the auxiliary roller (18) is mounted in bearings with the possibility of free rotation. The device according to claim 1, characterized in that the device comprises a pair of auxiliary rollers (18 '). A device according to claim 1, characterized in that said abutment surface (36) is perpendicular to the transverse shaft (23) .8. A device according to claim 1, characterized in that the device (10) comprises one support arm (20) configured to support two auxiliary rollers (18) .9. Device1. Устройство в лесотехнической машине (100), причем устройство содержит:шасси (12),одноосный набор катков (13), шарнирно прикрепленных к шасси (12), ипо меньшей мере один вспомогательный каток (18), установленный за пределами набора катков (13) для того, чтобы увелич
