You need a new timer
SOURCE: Dryer runs & heats but shuts off after 3-10 minutes
the motor overload can caouse that problem in that case new motor is needed if the dryer turn right back on after it turns off the even heat control board in panel bad if it humms are no noise after turn off and you have to let cool down the motor is the problem
SOURCE: Timer doesn't shut down dryer machine
the timer is easy to change, check how much it is first, mine was around $100.
SOURCE: Kenmore dryer timer doesnt move.
the timer contains a small electric constant speed motor, that advances the timer through its stages. the motor separately costs 1/2 as much as a new timer unit if you can buy it, your local parts guy may have rebuilt timer units for kenmore, popular brand.
partsselect.com or allaplicanceparts may have motors
and 2nd problem will be the hi limit thermal fuse, on the exhaoust duct internal to the dryer, small screw on device on the exhaust duct, when exhaust air reaches too high a temperature, like a blockage, they fail before a fire.
Clean the exhaust ducts all the way to the outside wall, lots of vent hoods block over time. then examin the exhaust duct for devices that look like this 
or like this 
with wires connected to the terminals. there may be 2(hi lo), test with a flashlilight bulb or meter conductivity good, no conductivity replace.
there are only a few different kinds the local parts guy will have them all. take the dud one for him to match.
SOURCE: kenmore 70 series dryer control/timer knob doesn't turn when running
THE TIMER HAS A SMALL DRIVE MOTOR THAT TURNS THE TIMER AT DIFFERENT SPEEDS FOR DIFFERENT CYCLES AND VARIES FROM BRAND TO BRAND BUT EITHER WAY YOU MUST REPLACE THE TIMER , EXPENSIVE FIX IF THE DRYER IS WORTH IT THAT SHOULD TAKE CARE OF THE PROBLEM
SOURCE: My Kenmore drier won't stop now! Perhaps timer isn't working?
Hi there. this is a timer issue. it counts down but, the actual shut off dial embedded in the timer mechanism is damaged for some reason. replacing the timer assembly will correct this issue. there are two parts to a timer. One, it times and last, it initiates the shutoff. the second action is not working properly. to be sure, check the relay before you purchase the new timer.
I have also provided you with a complete manual set that you can access and print out if you would like.
Click here for your manual
Click here for your instructions Guide.
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