Piston pump bearing shaft is the most important part to support member, if in bearing clearance is not guaranteed portion of pumped fluid permits three normal friction pair gap, but also a bad break deputy rub each static Hydraulic bearing oil film thickness, reducing the plunger so that the bearing shaft pump with life. According to information provided by the manufacturer of the pump are flat bearing axis, the service life of 10000h, this change more than the value of the new port will be required. Unloading commitment to dismantle the pump shaft under maintenance, no professional testing equipment is unable to detect the bearing axis gap swim out, but to use visual, such as found in the roller table marked with complexion changed or marks, it must be replaced. In more should, when the original bearing note bearing axis exchange letters and type hydraulic pumps, columns are large bearing axis of the plunger with large load capacity bearings, it is best to buy the original format of the original regulation, home plant products, if the replacement of another brand, should be bearing axis of experienced personnel to teach your look-up table on the exchange, the purpose is to maintain equi-precision bearing axis level and load capacity. In the main circuit safety valve, overload valve and other accessories intact under the premise of the inlet pipe and motor interfaces sealed (no spill), the motor being, the maximum pressure oil passage when measuring reverse; then turn on the motor piping, have measured the load pressure; last measured value is compared to its technical requirements determine the fault location. (2) Because the pump flow rate are inadequate or low pressure drop causes the motor output, torque and speed while reducing, so the determination of the flow rate should be synchronized with the measured pressure. (3) Check the assignment shaft and rotor bore clearance is within the allowable range (see table), check the assignment of the rotary shaft and the cylinder bore center line are the same, such as exceeding the allowable value should be re-assembled. If there is assignment shaft and the rotor hole with the gap of more than 0.6mm, or with orifices along the circumferential groove appeared to pull the rotor; the plunger and the rotor with the gap exceeds 0.05mm, the wheel axle and the chute side with the gap of more than 0.05mm, all inside cause low speed high torque curve motor rotation weakness. If the two travel motors are not synchronized, then it will track deviation. (4) The swash plate type axial piston motors, the long-term high-speed operation, the motor output shaft support bearing clearance increases, the axial positioning large gap over the disc spring compensation value; cylinder (rotor) and with flow cross-examination because the center location pole 4 disc spring is not normally the rotor cylinder is pressed against the valve plate (disc spring fatigue strength decreased detection stretch down the pump, in the cold state of the motor can operate normally, under the hot deformed disc spring will increase) , resulting in a reduced ability to repair pumps with flow, causing the motor running weakness. When the rotor and the cylinder bore clearance exceeds 0.05mm, or when more than normal wear and tear, will cause motor weakness and running slow. Repair of hydraulic pumps, hydraulic pumps, hydraulic creating crystal factory direct from 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!