Fault analysis of gear oil pump

Fault analysis of gear oil pump
Internal parts of the oil pump wear The inner parts of the oil pump wear and tear, causing internal leakage. Among them, the leakage area between the floating bushing and the gear end face is large, which is the main part of the internal leakage. This part of the leakage accounted for about 50% to 70% of the total internal leakage. The gear pump with worn inner leakage has a reduced volumetric efficiency, and the output power of the oil pump is much lower than the input power. All of its losses are converted into heat, which can cause the pump to overheat.
1. Internal parts of the oil pump wear The internal parts of the oil pump will cause internal leakage. Among them, the leakage area between the floating bushing and the gear end face is large, which is the main part of the internal leakage. This part of the leakage accounted for about 50% to 70% of the total internal leakage. The gear pump with worn inner leakage has a reduced volumetric efficiency, and the output power of the oil pump is much lower than the input power. All of its losses are converted into heat, which can cause the pump to overheat. If the joint plane is pressed, the floating sleeve will have a small amount of motion during operation, resulting in wear and tear. As a result, the implement will be lifted slowly or cannot be lifted. Such a floating sleeve must be replaced or repaired.
2. The wear of the oil pump casing is mainly the wear of the floating bushing hole (the normal clearance of the gear shaft and the bushing is 0.09~0.175mm, and the maximum must not exceed 0.20mm). The gear work is affected by the pressure oil, the gear tip is close to the oil pump casing, and the low pressure cavity portion of the pump body is worn. Another type of wear is the circumferential wear of the working face in the casing. This wear is mainly caused by the addition of oil, so it is necessary to add oil without impurities.
3, oil seal wear, rubber seal aging unloading sheet rubber oil seal aging deterioration, loss of elasticity, loss of sealing isolation of high pressure oil chamber and low pressure oil chamber, will produce high pressure oil chamber oil pressure to low pressure oil chamber, called " Internal leakage", which reduces the working pressure and flow of the oil pump. The normal working pressure of the CB46 gear pump is 100~110kg/cm2, the normal oil delivery is 46L/min, and the standard unloading rubber seal is 57×43. The self-tightening oil seal is a PG25×42×10 skeleton oil seal. When it is damaged or aged, the air is sucked into the oil pump from the gap between the oil seal and the spindle journal or from the joint between the oil inlet plate and the oil pump casing. The oil return pipe enters the oil tank, and a large amount of air bubbles are generated in the oil tank. It will cause the oil in the fuel tank to decrease, and the oil in the bottom tank of the engine will increase, which will make the agricultural implements rise slowly or not. The oil seal must be replaced to eliminate this fault.
4. The oil supply of the oil pump is insufficient or there is no oil pressure: the working device is slow to lift, shaking or lifting when lifting; there is air bubble in the fuel tank or tubing; the hydraulic system emits a “beep, bang” sound when lifting; the tractor just starts working The device can be upgraded. After the oil temperature rises for a period of time, the lifting is slow or unable to be lifted; when the load is light, it can be lifted, and the telescopic stage cannot be lifted under heavy load. The cause of the failure: (1) the hydraulic oil level of the hydraulic tank is too low; (2) The hydraulic oil is not used according to the season; (3) the oil inlet pipe is seriously blocked by dirt; (4) the oil pump drive gear oil seal is damaged, the air enters the hydraulic system; (5) the oil pump inlet and outlet joints or the bent joint "O" seal The ring is damaged, the fastening bolts of the bent joint or the inlet and outlet oil pipes are not tightened, the air enters the hydraulic system; (6) the inner leakage of the oil pump, the sealing ring is aging; (7) the end face of the oil pump or the end face of the main and driven gear bushings wear Or scratches, the unevenness of the end faces of the two bushings is out of tolerance; (8) the internal leakage of the internal parts of the oil pump causes the internal leakage; (9) the "left-handed" installed "right-handed" oil pump, causing the broken skeleton oil seal; (10) the hydraulic oil dirty.


'Failure analysis of gear oil pump

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