Brief analysis of common faults of torque converte

Brief analysis of common faults of torque converter and transmission of loader

1 system pressure drop

the normal working pressure of torque converter and transmission system of fl460 loader is between 1.0 and 1.6 MPa. When the pressure drops below 1.0 MPa, the loader will have weak work and difficult walking

the main reasons for such failures are as follows:

(1) the hydraulic transmission oil of the torque converter is not filled according to the provisions of the manual, but is filled with unqualified hydraulic transmission oil at will

(2) the filter element fixed with the transmission housing is dirty, causing the filter element to be blocked and the oil supply pressure to be insufficient

(3) the iron particles produced by the abnormal wear of the thrust bearing and thrust ring of the hydraulic torque converter make the distribution valve in the valve assembly stuck, causing internal oil backflow

(4) the distributing valve stem of the valve assembly is worn, causing internal pressure relief

(5) the iron particles produced by the abnormal wear of the ball bearings and thrust bearings in the gear set make the action of the distribution valve stuck and make the internal oil flow back

(6) the needle roller bearing of the pump assembly is abnormally worn, causing a slight longitudinal displacement of the driven gear during operation, and the oil supply volume changes

(7) the contact surfaces between the pump body, pump cover and the driving and driven gears in the pump assembly are worn, and the inner cavity oil pressure is relieved

the following points should be paid attention to when troubleshooting such faults:

(1) the qualified hydraulic transmission oil should be replaced according to the provisions of the manual and replaced in time

(2) maintain or replace the filter element fixed to the transmission housing on schedule

(3) the torque converter should be disassembled and checked regularly, and the thrust bearing and thrust ring should be replaced in time

(4) the valve rod of the valve assembly can be treated by spraying technology. The disadvantage is that the service life is very short, and the valve assembly can also be replaced

(5) the needle roller bearing and thrust bearing of the gear set should be disassembled and checked regularly. It is recommended to replace the bearing within less than one overhaul cycle. If it is forced to use, the gear will be abnormally worn or broken, causing greater economic losses

(6) the needle bearing of the pump assembly must be replaced in time after abnormal wear. Since it is difficult to purchase the parts individually, the assembly is generally replaced

(7) after the contact surfaces of the pump body, pump cover and driving and driven gears of the pump assembly are worn, they are generally repaired by grinding, and the grinding amount is not more than 0.5mm

2 oil overheating

slip of gear I, gear II and reverse clutch is the main cause of oil overheating. In serious cases, the shell is hot and oil is sprayed from the oil filler of the torque converter

the reasons why the oil temperature of hydraulic torque converter and transmission is too high are as follows:

(1) the friction plate is excessively worn with the improvement of the efficiency of solar cells, and the surface lubricating oil groove becomes shallow, which makes the heat dissipation effect worse due to the reduction of the amount of oil passing through

(2) the quality of domestic friction plates is unqualified, resulting in premature wear and overheating of oil temperature

(3) when assembling the clutch, the friction plate and steel plate shall be assembled in strict accordance with the specified quantity. If a friction plate or a steel plate is less installed for convenient assembly or cost reduction, although it is still available temporarily, the oil temperature can rise

the following points should be paid attention to when troubleshooting such faults:

(1) during disassembly point inspection, the wear depth of the oil groove of the friction plate should not be greater than 0.1mm; The unevenness of steel sheet warping shall not be greater than 1mm. If it exceeds the repair limit, it should be replaced in time

(2) although it is expensive to replace the imported friction plate of the original machine, it can ensure that it meets the technical requirements of the original machine

(3) assemble friction plates and steel plates in the amount required by the original machine in materials with a thickness of 5 (2) 0 mm

water flux increased by 30% 3. Leakage at the connection of the front cover of the torque converter

between the front cover of the hydraulic torque converter and the housing of the front cover of the transmission 5 The main reasons for oil leakage at the connection of our company's products with "quality 3 guarantees" are: O-rings are bruised during assembly; The screws at the connection are loose; The quality of O-ring is unqualified

due to the tedious work of dealing with this leakage point, it is recommended to assemble the original imported O-ring

4 it is difficult to shift

fl460 loader cannot shift, which is generally caused by the change of lateral displacement between the distribution valve and the pull rod. The specific reason is mainly the wear of the pull rod ball head or the loosening of the adjustment lock cap. In case of the above faults, check and adjust the adjusting pull rod