No matter what kind of construction machinery, excavators, cranes, bulldozers, forklifts, tractors and machinery are there .... These three systems, these three systems is very important to the entire machinery to determine the mechanical efficiency, performance what, the list of Lee's work that the hydraulic network of excellence that is the hydraulic system, engine system, electrical system. Many engineering machinery parts, such as hydraulic parts, engine parts, electrical parts, etc., to understand the hydraulic network of excellence Li Gong is actually a service for these three systems. Construction machinery operation of these three systems good or not, with the owner's blood pressure index is closely related, so important in view of these three systems, intends to make good use of the next few days to understand this situation.
Today, hydraulic Li Gong Shanghai compiled some information on the hydraulic system. And share with you the hydraulic system oil heat, high temperatures, will cause operation is not flexible, work is not continuous working pressure of work and decreased weakness and failure. Causes of fever are on the hydraulic system and the resulting hazards and preventive measures are simple analysis and discussion.

* The reasons for oil heating
(1) Fuel tank capacity is too small, heat dissipation area is not enough, the oil cooling system is not installed, or although the cooling device, but its capacity is too small.
(2) press the fast forward speed of the capacity of selected quantitative pump oil pump system, there will be at work most of the excess flow from the high pressure relief valve in the overflow back to the heat.
(3) loop unloading system failure or due to unloading is not set, loop, stop working when the pump can not be unloaded, the full flow of the pump under high pressure overflow, resulting in overflow loss and fever, leading to oil heat.
(4) system piping too small and too long, bending over, local pressure loss and pressure loss along great.
(5) lack of precision components and assembly of poor quality, the relative motion between the large mechanical friction losses.
(6) with the pieces with the gap is too small, or the wear and tear cause the gap is too large, internal and external leakage volume, resulting in loss of large volume, such as reduced volumetric efficiency of pumps, heat quickly.
(7) adjustment of the hydraulic system pressure higher than the actual needs. Sometimes due to tight seal, or seal damage due to leakage increases have increased the pressure to work.
(8) climate and operating environment temperature is high, resulting in temperature rise.
(9) Select the improper oil viscosity, viscosity, viscosity resistance, viscosity increase is too small the leak, two cases can result in heating oil.

* High temperature damage
(1) to produce thermal deformation of mechanical and hydraulic components in the thermal expansion coefficient of different moving parts with the gap becomes smaller and its stuck,causing action failure of the hydraulic system driving accuracy, resulting in deterioration of the quality components.
(2) to reduce the viscosity of the oil leakage increases, the pump volumetric efficiency and overall system efficiency will be significantly reduced. Reduce the viscosity of the oil, slide valves and other moving parts of the film was cut thinning and breaking, friction increases, resulting in increased wear and tear.
(3) deformation of the rubber seals, accelerated aging failure, reducing sealing performance and service life, resulting in leakage.
(4) accelerate the oxidative deterioration of oil, and precipitation of asphalt material, reducing the service life of hydraulic oil. Precipitates clogging pores and cracks damping valve port, causing death card can not move the pressure valve, elongation and bending of metal piping Code, or even rupture.
(5) to reduce the oil pressure of the air separation, oil dissolved air to escape, resulting in cavitation, resulting in reduced performance hydraulic system.

* Preventive measures
(1) according to different load requirements, always check and adjust the pressure relief valve to make it just right.
(2) a reasonable choice of hydraulic oil, particularly oil viscosity, under the conditions allow, as far as possible in order to reduce the viscosity of low viscosity that the friction losses.
(3) to improve the lubrication of moving parts to reduce friction loss, help to reduce the workload and reduce fever.
(4) hydraulic components and hydraulic systems to improve the assembly quality and its accuracy, strict control with the parts with the gap and improve the lubrication conditions. Sealing with low friction materials and improved seal structure, to minimize start-force hydraulic cylinder to reduce the mechanical heat generated by friction loss.
(5) providing the necessary cooling