Well, the Mark 89 is timer based and kinda old. If "it won't cycle" means the softener does not regenerate then it could be a seized piston, seals, or dead motor.

Manual is easy enough to find with Google (less than 10 seconds) but not very detailed... (copy & paste the URL into your browser)

http://www.hallswater.com/files/support/mk89_owners_guide.PDF

http://cassidywater.com/service/Mk89_812_Fr1984.pdf

http://culliganwater.com/sites/default/files/pdf/mark_89_and_812_water_conditioner_use_and_care_guide.pdf

Culligan doesn't like to sell parts and when they do they are VERY pricey. I'd look to replace that old 89 with a contemporary industry standard demand initiated softener. Will be much more water and salt efficient and you can get tech literature for free and parts almost everywhere.

This post was edited by justalurker on Wed, Jan 15, 14 at 18:59