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1. The oil supply of the oil transfer pump is insufficient and needs to be repaired or replaced.

2、空气滤清器堵塞而进气不畅，需要更换或清洁滤请器；

2. The air filter is blocked and the air inlet is blocked, so the filter needs to be replaced or cleaned;

3、柴油滤清器堵塞，需要更换

3. The diesel filter is blocked and needs to be replaced

4、低压油路供油不足，油箱通气孔堵塞，油管堵塞，破裂接头松动及垫片密封不严。需要找出故障对油路疏通并且更换。

4. The oil supply of low-pressure oil circuit is insufficient, the vent hole of oil tank is blocked, the oil pipe is blocked, the fracture joint is loose and the gasket seal is not tight. It is necessary to find out the fault, dredge the oil circuit and replace it.

5、燃料系中有空气或水分，可以排除空气或水分。

5. There is air or moisture in the fuel system, which can be eliminated.

6、油门拉线调整不当，需要调整。

6. The throttle cable is not adjusted properly and needs to be adjusted.

7、排气管或消音器堵塞而排气不畅，需要进行清洁。

7. The exhaust pipe or silencer is blocked and the exhaust is not smooth. It needs to be cleaned.

8、发动机温度过高，处理检查冷却系统找出故障并排除。

8. If the engine temperature is too high, check the cooling system, find out the fault and eliminate it.

9、喷油泵喷油量不足，需要校油泵。

9. The fuel injection quantity of the fuel injection pump is insufficient, and the fuel pump needs to be calibrated.

10、个别喷油器雾化不良，需要找出是哪里缸故障更换或修配喷油器。

10. Individual fuel injectors have poor atomization. It is necessary to find out where the cylinder is faulty and replace or repair the fuel injector.

11、喷油时间过早或过迟，需要调整。

11. The injection time is too early or too late and needs to be adjusted.

12、机械方面因素造成汽缸压力过低。属于机械方面因素有：配气机构气门关闭不严和活塞、活塞环、汽缸套磨损严重等。通常会调整气门间隙，重研气门或更换活塞、活塞环及搪、磨气缸套等。

12. The cylinder pressure is too low due to mechanical factors. The mechanical factors are: the valve of the valve train is not closed tightly, and the piston, piston ring and cylinder liner are seriously worn. Usually adjust the valve clearance, re grind the valve or replace the piston, piston ring, lining and grinding cylinder liner.