我厂东风340自卸汽车,在使用中发现气温降低至零下12°—15℃以下时,液压举升机构失灵。该机构失灵后,影响整车正常生产。为了使车辆保持正常工况,采用了加热气控液压系统的办法。经过加热后,液压系统虽能正常工作,但是,这样做不能保证车辆在低温情况下长时间使用。后来又采取改用粘度较低的液压油进 I plant Dongfeng 340 dump truck, found in use to reduce the temperature below minus 12 ° -15 ℃, the hydraulic lift mechanism failure. The failure of the body, affecting the normal production of vehicles. In order to keep the vehicle in normal working condition, the method of heating the pneumatic control hydraulic system is adopted. After heating, although the hydraulic system can work normally, however, this does not guarantee that the vehicle will be used for a long time at low temperature. Later, it was switched to lower viscosity hydraulic oil into