Possible reasons:
The cut-off valve in the oil circuit is closed or the oil intake is insufficient, or the oil filter is blocked.
The oil inlet temperature is low, the viscosity is too high or the oil inlet temperature of the pump is too high.
The oil pump is out of order.
The bearing of the fan motor is damaged.
Fan impeller is too dirty.
Solutions:
① Check whether the valve in the oil pipeline is open, whether the oil filter works normally, and clean the filter screen of the pump. ② Raise or lower the oil temperature. ③ Replace the oil pump. ④ Replace the motor or bearing. ⑤ Clean the fan impeller.
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