Here are some situations where you may need to replace the fan pump and fan motor:

Serious failure: If the fan pump or fan motor has a serious failure, such as burning, short circuit, open circuit, etc., and cannot be repaired, then it needs to be replaced.

Excessive wear: When the parts of the fan pump or fan motor are severely worn, resulting in reduced performance, increased noise or increased vibration, it may need to be replaced.

Reduced efficiency: If the efficiency of the fan pump or fan motor is significantly reduced and cannot meet the heat dissipation requirements, it may affect the normal operation of the excavator. At this time, you also need to consider replacing it.

Frequent failure: If the fan pump or fan motor often fails and the problem cannot be solved after multiple repairs, it may mean that the component has reached the end of its service life and needs to be replaced.

Upgrade and modification: During the upgrade and modification of the excavator, it may be necessary to replace the fan pump or fan motor with a better performance to improve the overall performance of the equipment.

Aging damage: As the use time increases, the fan pump and fan motor may age, such as seal failure, coil insulation performance degradation, etc. At this time, in order to ensure the normal operation of the equipment, it may be necessary to replace it.

When deciding whether to replace the fan pump and fan motor, you need to consider the severity of the fault, the cost of repair, the use requirements of the equipment, and other factors. If you have any doubts about whether to replace them, it is recommended to consult a professional maintenance personnel or engineer for more accurate advice. At the same time, regular maintenance and inspection can extend the service life of the fan pump and fan motor and reduce the occurrence of faults.