Your motor is still working, but not as well as it should. It vibrates, makes a noise and tends to stall.
Sounds like it's high time it was serviced or repaired. That doesn't mean the motor needs to be rewound, but crucial parts such as the bearings, fan, terminal block and flange may need replacing.
We'll produce an estimate of the costs for you, summarising the parts that need to be replaced. You can also choose whether you want the electric motor to have extra treatment against moisture, dust or other harmful influences.