Output flow fluctuations related to many factors. Variable pump can be considered controlled variable caused by poor organization, such as foreign matter into the variable mechanism, set aside the order marks in the control piston, wear marks, scars, resulting in unstable control piston movement. Because the amplifier energy shortage or damaged parts, comprising a control piston spring damper effectiveness is poor, it can cause instability in the control piston movement. Unstable flow is often accompanied by pressure fluctuations. Such failures are generally open hydraulic pump maintenance, replacement of damaged parts, increased damping, spring rates and improve control pressure. Inlet pipe is too small, the flow capacity into the oil filter too small or clogged intake air inlet pipe, exclusion of oil is too high, too low, insufficient oil suction and pressure pipes produce liquid impact, etc., will produce noise . Therefore pump agent, must be properly designed tank, the correct choice filter, tubing and directional valve. Overheating hydraulic folding excessive heat pumps for two reasons, one is mechanical friction and heat. Since moving surfaces in dry or semi-dry friction friction state service pumps, heat friction between moving parts. The second is a liquid friction and heat. High pressure oil leak to the low pressure chamber through a variety of gap, a large number of hydraulic energy into heat energy loss. Therefore, the correct choice of the gap between moving parts, fuel tank capacity and cooler pump, the pump can prevent excessive heat and high oil temperature phenomenon. Also, back to the oil filter blockage caused by excessive back pressure back to the oil, the oil temperature is too high and can cause the pump to overheat. Hydraulic pump repair _ _ crystal create hydraulic preferred by the Jinan Jing Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead crystal create hydraulic and you hand into the brilliant, for a better future!