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Loader gearbox oil level rise problem

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A ZL-30C loader that has been used for three years; every time the engine is started; the venting hole of the torque converter gear chamber is simmered outward; and the oil level in the oil tank of the gearbox is gradually increased.
The gearbox and torque converter of the machine belong to the split layout; the hydraulic system consists of three independent circuits: the working equipment circuit, the operating circuit and the steering circuit. The power of the engine is driven by the automatic gear on the pump casing to the torque converter. Three gear pumps on the housing work.
Analyze the hydraulic system of the machine; there are three main reasons for the formation of the oil at the vent hole of the torque converter: one is that the outlet pressure valve spool is stuck; the outlet pressure of the torque converter is greater than the inlet pressure; the other is the oil seal of the torque converter guide wheel seat Damage; the pressure oil in the torque converter leaks from the guide wheel housing to the torque converter gear chamber; the oil is formed at the vent hole; the third is the oil seal of the shaft end of a certain hydraulic pump; the viscosity of the hydraulic oil is large when the engine is started; the pressure of the pump Larger; more hydraulic oil leaks from the oil seal of the shaft end of the pump shaft; the oil is formed at the vent hole of the torque converter. The oil level in the oil tank of the gearbox rises; it may only be the hydraulic oil leaking into the gear chamber of the torque converter. Through the connection between the torque converter and the gearbox; leakage into the oil tank of the transmission; then only the steering hydraulic pump or the hydraulic pump shaft of the working equipment is damaged.
After dismantling; found that the oil seal at the shaft end of the steering hydraulic pump has been damaged; after replacing the oil seal; test the vehicle; the appearance of the fault is not seen; the analysis is verified.

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