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it's the motor that makes the humming sound..it may have difficulty in starting..when starting like this the motor draws more current and this may cause the windings to burn out..try reducing the load..if the sound disappears then indeed the capacity of the motor is deteriorating...take out motor and clean bushing and lubricate.. also realign belt ..
The motor switch that is mounted on the motor may need replacing. The knocking could mean that the "run" winding is cutting off momentarily, and running on the "start" winding of the motor. I dont know about a 22 year old model, but in most "near modern" machines, the switch has a plastic actuator that is pushed when the motor obtains near-run speed, that plastic may be worn or the actuator part on the motor may be at fault. If you replace the motor, you usually get this switch as part of the deal.
Did it make this noise just when it stopped spinning. Just for a couple seconds? If so, it's only brake noise and not a concern. If it does this all during spin you probably have a bad tub bearing. Is it a roaring noise? This is what the bearing will sound like.