| Fault phenomenon | 原因分析 | Exclusion Method | 
| 1. The motor does not turn | ①The hydraulic pump is not started or is not turning in the correct direction | ① Start the hydraulic pump or correct the pump's rotation direction | 
| ②油箱储油量不足 | ②Add to the specified oil amount | |
| ③The directional valve is in the neutral position | ③Switching Directional Valve | |
| ④The pressure setting value of the overflow valve is too low | ④System pressure adjusted to the specified value | |
| ⑤Motor output torque is insufficient | ⑤Replace motor | |
| 2. The noise is too loud during operation | ①There is air in the hydraulic system | ①Identify the intake cause and eliminate air in the oil | 
| ②Suction | ②Increase fuel supply | |
| ③Failure of internal components such as bearings in the motor | ③Replace bearings and other damaged parts | |
| 3.内、外泄漏过大 | ①Sealing component damage causes internal and external leakage | ①Replace sealing components | 
| ②Motor parts have air holes, sand holes, cracks, etc. | ②Replace parts | |
| ③Loose bolts | ③Tighten the bolts | |
| 4. Abnormal fever | ①Hydraulic oil temperature is too high | ①Increase cooling capacity | 
| ②Motor efficiency decreases | ②Replace consumable parts | |
| ③Abnormal wear | ③Replace motor |