Any time any washer won't stop filling unplug the machine first and if the water continues to enter the machine you have a bad fill valve plain & simple. Replace the inlet valve assembly with a new one if available, don't even think of disassembling and cleaning-rebuilding unless a new one is not available for your washer. If the water does stop coming in then start looking at the water level switch and the little hose attached to it that runs down and attaches to the outer tub. A lot of MTs get a gunky buildup in the larger part of this hose where it transitions down in size that can eventually clog and cause the washer to over fill and flood. This clogging usually results from washing in too cold water with too little detergent and possibly too much fabric softener.

The band clamp and rubber gasket around the top of the tub usually doesn't leak unless it has been disturbed. But if you need to reseal this you usually don't need a new rubber gasket unless yours is hard & cracked, if it is not it can be reinstalled with some silicone sealant if necessary.