The maintenance of the oil pump (1)Use 32# or 46# hydraulic oil, based on operation environment； (2)Infuse the pump oil filtered through120 – 160 strainer； (3)Gradually boost and release the pressure in operation to avoid oil circuit of lash. (4)Do not adjust the high pressure valve and low pressure valve at will. When necessary, the pump should be assembled with manometer. Adjust the jack bolt until the pressure reach its set point.
