Intermatic T101, T102, T103, T104, T105, or T106 Timer Switch Repair - Quick and Cheap

Safety first! Never work on live electrical wiring! Always make sure to turn off the circuit breaker before you do any electrical work!
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An old Intermatic T101 timer started to slow down and skip the set ON and OFF times. In this particular case, a tiny plastic gear attached to the rotor of the timer's motor had worn out, broken teeth. I used another cheap timer of the same Intermatic brand to get a replacement gear. It was a quick and cheap project that put the broken timer back in service. The same procedure applies to the entire Intermatic T100 series: T102, T103, T104, T105, or T106.
If I planned to replace the entire timer, I would consider one that includes "astronomical" or "sunrise/sunset" auto option, with a back up battery for power failures. It will automatically adjust the ON OFF times according to your local daylight. For example: Honeywell programmable Indoor and Outdoor Timer with Solar timetable, (TI044) - currently sold for around $80

[@JulianTrivino-f8e]

Thank you for the video!! I had this same problem and fixed it by watching your video! I used my neighbors pool pump who's house is getting demolished. Pulled his part and now we are running. I really appreciate you taking the time to post this.

[@tektech1065]

This fix should double its mileage 👍