I don't have a breakdown for the 18311. I do have the square back #'s 18514-06(32"), 18516-05(36"), 18516-06(36") and the round back #18538-01(38")
I think the 18538-01(38") might be the same. Anyway the good news is the u-joint and shaft is the same on all these sno-casters. The part # for the u-joint is 1715008 and the u-joint and shaft is part # 1713650.
More good news, these parts are used on most of the decks such as these 38" decks 18415-01, 18416-01, 18416-02, 18417-01, and 18418-01. On the 38" deck model # 18449-01 the u-joint is the same but not the u-joint and shaft.
On the 42" decks models 18421-01, 18422-01, 18423-01, and 18423-02 the u-joint and the u-joint and shaft are the same. On the model 18457-01 42" deck only the u-joint is the same.
These show up on ebay from time to time. You may want to check the "parts suppliers" sticky at the top of the bolens section. New parts will be expensive, try the guys selling used first.
If you want me to post the parts list and breakdown for the 18538-01(38") sno-caster let me know.
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