Hydraulic oil tank by air pressure, after each start of the machine, must wait for the hydraulic tank to reach the use of air pressure, to operate machinery. Straight shaft and inclined plate type piston pump is divided into two types of pressure oil supply type of self absorption type. Pressure supply type hydraulic pump mostly uses the oil tank, also has the hydraulic pump itself with the oil pump to provide pressure oil to the hydraulic pump. Self suction type hydraulic pump with a strong self absorption capacity, without the need for external supply.