自动变速器故障原因：液压油油面太低或太高，运转中被行星排剧烈搅动后产生大量气泡。离合器或制动器摩擦片、制动带磨损过甚或烧焦。油泵磨损过甚或主油路泄漏，造成油路油压过低。

Reason for automatic transmission malfunction: The hydraulic oil level is too low or too high, and a large number of bubbles are generated during operation due to violent agitation by the planetary gear. Excessive wear or burning of clutch or brake pads or brake bands. Excessive wear of the oil pump or even leakage of the main oil circuit can cause low oil pressure in the oil circuit.

故障诊断及排除

Fault diagnosis and troubleshooting

1. 检查自动变速器内有无液压油。其方法是：拔出自动变速器的油尺，观察油尺上有无液压油。若油尺上没有液压油，说明自动变速器内的液压油已漏光。

1. Check for hydraulic oil in the automatic transmission. The method is to pull out the oil dipstick of the automatic transmission and observe whether there is hydraulic oil on the dipstick. If there is no hydraulic oil on the dipstick, it indicates that the hydraulic oil in the automatic transmission has leaked completely.

2. 检查自动变速器操纵手柄与手动阀摇臂之间的连杆或拉索有无松脱。如果有松脱，应予以装复，并重新调整好操纵手柄的位置。

2. Check if the connecting rod or cable between the automatic transmission control lever and the manual valve rocker arm is loose. If there is looseness, it should be reinstalled and the position of the control handle should be readjusted.

3. 拆下主油路测压孔上的螺塞，起动发动机，将操纵手柄拨前进挡或倒挡位置，检查测压孔内有无液压油流出。

3. Remove the screw plug on the pressure gauge hole of the main oil circuit, start the engine, move the control lever to the forward or reverse gear position, and check if hydraulic oil flows out of the pressure gauge hole.

4.若主油路侧压孔内没有液压油流出，应打开油底壳，检查手动阀摇臂轴与摇臂间有无松脱，手动阀阀芯有无折断或脱钩。若手动阀工作正常，则说明油泵损坏。对此，应拆卸分解自动变速器，更换油泵。

4. If there is no hydraulic oil flowing out of the pressure hole on the main oil circuit side, the oil pan should be opened to check for any looseness between the manual valve rocker arm shaft and rocker arm, and whether the manual valve core is broken or unhooked. If the manual valve is working properly, it indicates that the oil pump is damaged. In this regard, the automatic transmission should be disassembled and the oil pump replaced.

5.若主油路测压孔内只有少量液压油流出，油压很低或基本上没有油压，应打开油底壳，检查油泵进油滤网有无堵塞。如无堵塞，说明油泵损坏或主油路严重泄漏，对此，应拆卸分解自动变速器，予以修理。

5. If only a small amount of hydraulic oil flows out of the pressure measuring hole in the main oil circuit, and the oil pressure is very low or basically no, the oil pan should be opened to check if the oil pump inlet filter screen is blocked. If there is no blockage, it indicates that the oil pump is damaged or the main oil circuit is severely leaking. In this case, the automatic transmission should be disassembled and repaired.

6.若冷车起动时主油路有一定的油压，但热车后油压即明显下降，说明油泵磨损过甚。对此，应更换油泵。

If there is a certain amount of oil pressure in the main oil circuit when starting a cold car, but the oil pressure drops significantly after heating up the car, it indicates that the oil pump is severely worn. In this regard, the oil pump should be replaced.

7.若测压孔内有大量液压油喷出，说明主油路油压正常，故障出在自动变速器中的输入轴，行星排或输出轴。对此，应拆检自动变速器。

If a large amount of hydraulic oil sprays out from the pressure measuring hole, it indicates that the main oil pressure is normal, and the fault is in the input shaft, planetary gear or output shaft of the automatic transmission. In this regard, the automatic transmission should be disassembled and inspected.