It looks like a spring-driven, mechanical timer. If that’s the case, you’ll probably just need to get a new timer. If you’re pretty handy, it is not difficult to replace. An appliance parts store can get you a timer, but Ebay might have one, and probably much less expensive. Just be sure it is exactly the same, made for your exact dryer model if you go that route. I have to say this. A non-functioning timer could lead to overheating your clothes, therefore be a fire hazard. If you are not sure how to replace the timer, the safer option would be to call a professional appliance repair technician. Get exact cost in advance and compare that to the value of your dryer with its age considered. Then decide if it is worth the money or if you need to replace the dryer . As an example of parts cost. I repaired my Maytag range with a part from Ebay that cost me $8. The appliance parts store wanted close to $80 for the same part. I wish you luck. Always disconnect electricity before removing covers of appliances. Steve, Dallas, Texas