http://waterheatertimer.org/pdf/Tork-8000Series.pdfTork 8600 is variable cycle timer.
Each revolution of dial is 60 minutes, 30 minutes or 6 minutes depending on model.
60 minute timer has 2 models, 120V and 240V.
Other models are 120V.
If clock is not keeping time, then clock motor is bad.
I don't have a source for clock motor, and suspect that a new timer is purchased and then installed into existing box.
Link below sells 8601 60 minute 120Volt
http://www.weisd.com/store2/tork/torktimer1.phpTo set times, the dial has tabs located around dial.
Tabs are tilted in or out
Tab out = NC terminal has power
Tab in = NO terminal has power
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