Loader torque converter the cause of the oil temperature is too high and out countermeasures

Loader torque converter the cause of the oil temperature is too high and out countermeasures - 2019 08 - 19 a, introduction torque converter is mainly composed of pump wheels, turbine and guide wheel. Torque converter is installed between the engine and transmission, hydraulic oil as working medium, the transmission torque, speed and the clutch. Actual use process, high torque converter oil temperature is one of the more common fault and its harm is bigger, the mechanical transmission efficiency and service life of parts of the transmission system has a different degree of influence. Generally speaking, the average efficiency of torque converter of loader's normal use within the scope of 75% ~ 85%, that is to say, there are 15% ~ 25% from the engine the power will be passed into a torque converter working oil heat, make the oil temperature rise high. Normal work, the export of torque converter oil temperature is 80 ℃ ~ 110 ℃, a short period of time allowed 110 ℃ ~ 120 ℃. In excess of the prescribed scope of temperature continue to use will lead to a series of negative effects, such as: work oil deterioration, the viscosity, lubrication effect to drop, affect the service life of the entire transmission system; Seal aging, deformation, sealing effect decreased, resulting in failure of oil leakage of leakage or work happens, the normal operation of the loader, etc. Second, the reason of the torque converter oil temperature is too high and elimination method in use process, the heat generated by the hydraulic transmission system through working oil circulation into the cooling system heat dissipation. If the cooling system anomalies or hydraulic transmission system which link produces too much heat is likely to lead to torque converter oil temperature is too high. Too much heat generated by the hydraulic drive system of links can be roughly from several aspects to consider: the oil viscosity and the amount of oil is normal; Oil have blocked; Oil pressure is normal; Parts whether there are abnormal friction; Operation is reasonable. The following is the specific analysis and troubleshooting advice. 1, the cooling system is working correctly. Use a set of cooling system and engine hydraulic transmission system, if cannot normal heat dissipation of the cooling system, the oil temperature rises quickly. Inspection according to check whether the water is enough, when the radiator blockage, fan belt is normal, water pump, thermostat, etc. It is working correctly. 2, hydraulic transmission oil viscosity and oil is normal. High oil viscosity will increase power loss, high oil temperature rise, low viscosity increased leakage, make transfer efficiency drops, can cause high oil temperature rise; Oil too much will make high-speed rotating components resistance increases, high oil temperature, oil amount too little, participate in the work of the oil is accelerated circularly, working oil cooling time in the tank, also can make oil temperature rise high. Maintenance according to the need to reduce, supplement, or replace the oil. 3, line, or filter blockage. Congestion can smooth circulation, the oil can't lead to participate in the circulating oil to reduce, a decline in the general cooling effect of the system, on the other hand, the oil pump load also increases, both can lead to high oil temperature rise. When maintenance should be smooth, clean lines, clean or replace oil filter and replace the oil. 4, the oil pressure is normal. Torque converter inlet pressure low if make the torque converter work efficiency will be reduced, the oil temperature is high, if the outlet pressure is lower than the setting pressure, oil return valve cannot open, circulating oil into the cooling system, leading to a high oil temperature rise. Import and export pressure valve setting pressure or jams are likely to lead to the failure, can test the first hydraulic maintenance overhaul pressure valve cleaning again. 5, if there is a abnormal friction parts. 1) The oil pump. Oil pump internal if worn over limit or seals damaged, can reduce leaking seriously, volumetric efficiency, the system pressure is low, leading to a high oil temperature rise. Maintenance should be first to test the pump output pressure, if low the collapse of the repair, adjust clearance, replacement of seals or repair, ensure that the oil pump gear and cover the gap between the standard range. 2) Torque converter internal. Torque converter internal seals are damaged, gears, bearings and other parts are damaged, or guide roller, the clearance between the pump wheels, turbine more than the limit, will make the oil temperature rise high. Maintenance can check the oil filter, or moderate oil drain first, see if any obvious powdery metal or black jelly, if determine the torque converter internal fault, need to collapse to repair, replace the corresponding parts, and need to clean the whole hydraulic system. 3) The gearbox. If the transmission control valve valve core, gear clutch piston seals, clutch wear, is likely to lead to oil temperature rise high. Can check the oil filter when maintenance or moderate oil drain, confirm whether there is a metal powder, make good use of hydraulic principle diagram, the process of inspection to lateral pressure of each test mouth, confirm the specific point of failure and then to disassemble repair, avoid by all means is blind to repair. 6, the operation is reasonable. If a torque converter in high load condition for a long time, the heat generated by the long time work is higher than heat exhaust heat, oil temperature will rise. This requires drivers to use specification, forbidden rough operation. Three, in the causes of the torque converter oil temperature is high, and the harm of high oil temperature is bigger, more found high oil temperature should immediately stop operation, after the step, primary and secondary organized check, troubleshooting step by step, after repair to participate in the work, avoiding damage to spread. Besides fault after the repair work, the use of the loader should also focus on the standardization of operation and regular maintenance of execution, ensure the normal service life of converter.