The motor will need either a rebuild with new bearing, or replacement. Parts should be no more than $100 .EASY project. 20 minutes max fro a pro shop. If you can tie your shoes you can do this one yourself.
If replacing, upgrade to a ball/ ball ( double ball bearing) motor, same height, generally an AMTEK Lamb. A ball ball motor will give longer life
Under the cap you have removed are 3 screws.
You will detach them last. Note they are slightly offset in their pattern.
Open the vac as though changing the cone. Remove the plastic cone by undoing the center screw. Remove the inner filter disc and change . This should be changed every 6 months...
Now you will see three, screws or nuts in a triangle pattern. Detach them. Remove the rubber switch pedal from above .
.Now detach the upper 3 screws and the motor housing will lift off. Voila. Inspaect the cord inside and out for wear at it's socket. Now is the time to shorten if required.
There should be an insulating disc about the size of a coin between the motor top and the screen below the vac handle. You MUST reinstall on the new motor in case of a short in the vac.
Remove the foam or felt "muffler" and clean or replace.
Remove the wire nuts and note the wiring pattern for the switch, motor and power head. Note the motor position versus the cord. Mark with felt pen and reinstall the same.
Do not twist the wires when reinstalling, only twist the wire nuts. Check that they are tight and reinstall in opposite order.
Please post back if tehre is a problem or this helps
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