Hydraulic torque converter - bearing fault detection and maintenance knowledge

Hydraulic torque converter common fault mainly include: high oil temperature, low oil pressure, oil, machine driving speed is too low or weakness, and work in a abnormal sound, etc. 5. 1, the oil temperature is too high, the oil temperature is too high performance for machine working oil temperature table more than 120 ° C or soup hand touch feeling, mainly has the following several reasons: the transmission oil level is too low; In the cooling system of water level is too low; Tubing and cooler jam or too dirty; The torque converter is in low efficiency within the scope of work time is too long; Wheel fastening screw loose; Bearing fit loose kuang or damage; Comprehensive type hydraulic torque converter for free wheel stuck atresia; Wheel assembly free wheel mechanism when institutions lack of parts. Hydraulic torque converter oil temperature is too high failure diagnosis and elimination method is as follows: the oil temperature is too high, first of all, should immediately stop, let the engine idle speed running, check the presence of leakage of the cooling system, water tank is filled with water; If the cooling system is normal, should check whether the transmission oil level is located in the oil dipstick between two tags. If the oil level is too low, should be added to the same type of oil; If the oil level is too high, it must be oil discharge to proper oil level. If the oil level meets the requirements, should adjust the machine, the torque converter working in high efficient area scope, avoid the inefficient district work time. If adjust the machine working condition after the oil temperature is too high, should check the tubing and the temperature of the cooler, if use hand touch at low temperature, discharge tubing or cooler jam or too dirty, should discharge tubing will be removed, check for sediment jam, if any sediment should be cleared, then fitted with joints and seal leakage of tubing. If feel when touch the cooler temperature is very high, we should let out a small amount of oil in torque converter shell for inspection. If the oil is at the end of the metal, bearing kuang or damage, lead to wheel wear and cope with its decomposition, replace the bearings, and check whether the pump impeller and pump wheel fastening bolt is loose, loose if should be tighten. Check the items mentioned above are normal, but the oil temperature is still high, should check whether the roller work normally. The engine throttle fully open, make the working condition of hydraulic torque converter at zero velocity, for hydraulic torque converter outlet oil temperature rise to a certain value, and the working condition of hydraulic torque converter in hydraulic coupler, to observe the oil temperature drop. If the oil temperature drop speed is very slow, may be due to the free wheel jammed and make the idler pulley atresia, inspection should be disassembled hydraulic torque converter. 2, low oil pressure phenomenon is: when the engine throttle wide open, the torque converter inlet oil pressure is still less than the standard values. Mainly caused by the following reasons: less oil, oil level is lower than the oil suction mouth plane; Pipe leakage or blocked; Flow to the transmission oil too much; Into the tubing or oil screen plugging; Hydraulic pump badly worn or damaged; Oil suction strainer installed improperly; The oil foaming; Import and export pressure valve cannot be closed or spring stiffness decreases. If there is an oil supply pressure is too low, should first check the oil level: if the oil level is lower than the lowest scale, should add oil; If the oil level is normal, should check into and out of the tubing leaks, if there is oil, should be ruled out. If into and out of the tube seal is good, should monitor the performance of the inlet and outlet pressure valve, pressure valve at the inlet and outlet of the if not closed, and should be removed, check the parts on the crack or scars, oil and the oil hole was clear, and the spring stiffness is smaller, found that the problem should be resolved in a timely manner. If the pressure valve is normal, should remove the tubing or mesh for inspection. If there are any jam, should be clean and clear the sediment; Such as tubing, need to check the hydraulic pump, replace the hydraulic pump when necessary. If the hydraulic oil foaming, should check the return pipe installation, such as the return pipe of oil level is lower than the oil level of oil pool, should install back in tubing. 3, torque converter oil torque converter oil is mainly due to the torque converter rear cover and pump wheel hard surface and pump wheel and wheel hub connecting bolts loose or hard seal due to aging or damaged. Found the spill should start the engine, check the oil spill area. If from the joint of torque converter and engine oil, pump impeller and pump wheel cover connecting bolt looseness or seal aging and should be replaced fastening bolts or O ring; If from oil, torque converter and transmission joint connection pump impeller and pump wheel is loose or sealing ring is damaged, should tighten bolts or check the sealing ring; If the spill site in filler or oil drain port location, shall check the looseness of the bolt connection, and whether there is a crack, etc. 4, machine driving low speed or inability to this kind of failure is mainly caused by the following reasons: hydraulic torque converter internal seal damage, impact the working cavity flow down; Free wheel mechanism jammed, idler pulley atresia; Free wheel wear failure; Wheel blade damage; Inlet and outlet pressure valve damage; Hydraulic pump wear and tear, oil supply is insufficient; Hydraulic oil level is too low; A fault in transmission roller clutch friction. Machine gear start, if the road is unable or slow, should first check the gear pressure gauge whether indicated pressure within the normal range, if the pressure is too low should be ruled out; If the pressure is normal, may be free working blade wheel wear failure or damage; Also may be transmission friction clutch fault exists, should carry on the concrete analysis and ruled out. 5, hydraulic torque converter working there are abnormal noise, the fault is mainly due to the bearing or damage to the wheel causes such as loose loose connection or connected to the engine. Appear this kind of circumstance, should first check whether all delivery parts loose, then check the bearings, if there are any loose kuang should adjust or replace new bearing. In addition, also should check the oil amount and quality of hydraulic oil, add or replace new oil when necessary.