Hydraulic pump is serious wear and the methods to improve

Methods 2019 - hydraulic pump serious abrasion reasons and improvement 02 - 23 when excavator hydraulic pump serious wear have a fatal impact on the excavator, thus excavator such problems must be solved in a timely manner. When excavator hydraulic pump maintenance from the following three points to find the cause of the problem: ( 1) Check movable arm cylinder leakage is the simplest method of excavator hydraulic pump maintenance, the rising of the movable arm to see if it has obvious free fall. If drop obviously remove oil cylinder to check, seal ring must be changed if already wear. （ 2) Check control valve cleaning first safety valve, check valve core for wear, such as wear should be replaced. Safety valve is installed if still no change, check control valve abrasion of valve core, its clearance generally use limit of 0. 6 mm, badly worn should be replaced. （ 3) Measuring the pressure of hydraulic pump if pressure is low, adjustment, and pressure is still not up, the hydraulic pump serious wear and tear. Built movable arm a, general load cannot ascend the main reason is: 1, excavator hydraulic pump serious wear and tear when pump internal leakage at a low speed; High-speed operation, the pump pressure is slightly increased, but due to the wear and inner drainage pump, a significant reduction in the volume efficiency, it is difficult to achieve the rated pressure. Hydraulic pump to work long hours and contributed to the wear and high oil temperature rise, the resulting wear hydraulic components and seal aging, damage, loss of seal ability, hydraulic oil deterioration, resulting in failure. 2, unreasonable hydraulic components selection of movable arm oil cylinder non-standard specifications for 70/40 series, also for non-standard seal, high manufacturing costs and inconvenience seal replacement. Movable arm oil cylinder bore little, it is bound to make the system setting pressure is high. 3, the hydraulic system design is not reasonable control valve and hydraulic steering gear for the single pump in series, the relief valve setting pressure points and 16 mpa, and the rated working pressure of the hydraulic pump is 16 mpa. Hydraulic pump in full load or overload for a long time (often High pressure) Work, and the system has a hydraulic impact, not an oil change for a long time, the hydraulic oil contamination, increase hydraulic pump wear, so that the hydraulic pump shell burst ( After found this kind of failure) 。 Second, the improvement and effect ( 1) Improvement on the design of the hydraulic system after many arguments, excavator hydraulic pump maintenance finally adopted advanced priority valve and load sensing hydraulic steering gear form, the new system can in accordance with the requirements for steering, prior to the distribution of flow, regardless of the load size, the steering wheel rotation speed to ensure oil supply is adequate, the rest can be used all the work device of the supply circuit, thereby eliminating the loss caused by steering loop oil supply too much power, improve the efficiency of the system, reduce the working pressure of hydraulic pump. Reduce the excavator hydraulic pump serious wear and tear. （ 2) Optimization design of movable arm oil cylinder and hydraulic pump modelling to reduce system pressure. Through optimizing calculation, movable arm 80/4 cylinder with a standard series. Hydraulic pump displacement from 10 ml/R is 14 ml/R, system setting pressure for 14 mpa, met the movable arm oil cylinder lifting force and speed requirements. （ 3) Strengthen the daily inspection and maintenance in use process should also pay attention to the correct use and maintenance excavator, add or replace the hydraulic oil regularly, maintain the cleanliness of hydraulic oil, strengthen the daily inspection and maintenance. Avoid excavator hydraulic pump serious wear and tear, such ability reduce maintenance frequency excavator hydraulic pump.