My Kenmore series 80 washer does not fill up all the way with water even when it is on full load.

There is a clear plastic hose that runs from the load selection switch to the side of the washer drum. This hose connects the fill sensor to the load switch. without it being in good condition and connected properly the washer won,t get a signal that it's full.

Possibly your problem is the tube that tells the machine when the water is full. It may be blocked.

have you checked the motor coupling?

Yes, probably the fill valve.

it sounds like the water valve is bad,the water valve level(sm. med. lg.)controls the water valce-mike

if your washer will agitate when set to fill but not fill, then your pressure switch is bad.
also you may want to check and see if you are getting both hot and cold to your washer.

remove edge decore trims from left and right side front of control panel
remove phillips screws from bottom corners of contol panel
remove knob from water level selector
raise control panel ~1 inch then flip over backwords on pivots
depress lock tab on right/underside of water level control body where it touches metal mount plate
rotate water level control body 45deg anti clockwise
pull body off
top side of body next to knob shaft is 1/8 hex head bolt
turn clockwise to rais water level
anticlockwise to lower water level
machine can be operated with this part not fitted so can check level. fill, adjust screw, fill will start again, adjust screw, until water level is correct
reinstall in reverse order
Incidentally, the cause is a VERY small wire spring inside the control body that is not really up to the task, and stretches over years.
Its a common occurrence, and I make this repair, on callouts, no parts required, couple times a month you may have to flip the switch to reset to get the water to restart filling

Replace the water inlet valve. 285805

water level switch