The main reasons for the sewing machine oil pump not producing oil include poor sealing of the oil pump, oil quality issues, blockage or leakage of the oil supply pipeline, incorrect steering of the oil pump, and damage to internal parts of the oil pump. ‌12

The specific inspection and solution methods are as follows:

Check the sealing of the oil pump: Ensure good sealing between the suction pipe and the gear oil pump body and pump cover to prevent air leakage into the oil pump.

Check the quality of the oil: Ensure that the oil used is of good quality and free from impurities or foreign objects. If there are impurities in the fuel tank, it should be cleaned.

Check the oil supply pipeline: Check whether the oil supply pipeline is blocked or leaking, and clean or replace it if necessary.

Check the direction of the oil pump: Ensure that the direction of the KCB gear oil pump is consistent with the direction indicated on the pump.

Check the internal parts of the oil pump: If the plunger does not return, it may be stuck by debris or the spring may be broken, and the oil pump needs to be removed for cleaning or replacement of parts.

Preventive measures:

Regularly check the sealing and steering of the oil pump to ensure its normal operation.

Use high-quality oil to prevent impurities from entering the oil pump.

Regularly clean the oil supply pipeline to prevent blockage or leakage.

Regularly maintain the internal components of the oil pump and replace worn or damaged parts in a timely manner.