| 摘要 |
PURPOSE:To prevent an abrupt increase in engine load when a hydraulic pump is shifted into a two-pump mode from a one pump mode. CONSTITUTION:A hydraulic oil supply source including a main pump 16a and a subpump 16b which are driven by an engine, a supply passage 18 and a cooling fan device 24 connected in the latter, an LSD 20 connected to the supply passage downstream of the cooling fan device 24, a passage 14 for returning hydraulic oil into the supply source from the LSD, a control device 70 for controlling the subpump and the cooling fan device 24. This control device decreases the pressure differential across a hydraulic motor 38 for the cooling fan device for a predetermined time when the subpump is operated in such a condition that the main pump is operated. |
