My 1984 Whirlpool washer Solid State Mark II Series fills correctly, but when agitation starts the water is pumped out while agitating until a minimum level is reached and then it refills. This continues until the proper washing cycle time is achieved.

Any ideas on cause and parts needed?

Also, the Load Size Selector is not functioning - so am getting the maximum fill allowed rather than able to do small loads.

What part is needed to correct this problem?

Thank you.