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Message: <blockquote data-quote="aaa123" data-source="post: 37550" data-attributes="member: 2816"><p>You can look at the blow-up diagram on the Case web site:  <a href="http://www.caseih.com/northamerica/PartsService/Pages/search.aspx" target="_blank">http://www.caseih.com/northamerica/PartsService/Pages/search.aspx</a> Not sure if you knew that. My 1835B is very similar but doesn't have the intermediate plate because the chain sprockets can come out the top instead of having to come out the side. On mine it's dead simple - the axle housing has a stub axle sticking out that goes through the chain sprocket and fastens with a castle nut and cotter pin inside the chain housing. If I take the chain covers off I can see the castle nut right there. I'm guessing the 1840 can't be too much different. To reinstall just put the axle housing back and lift the chain sprocket back onto the stub axle, and put the castle nut back (service manual says 75-95 ft-lb.) Then adjust the chain tight again with the adjuster and the axle housing nuts to 100 ft-lb. Yours has that extra plate in between but I think the rest is pretty much the same. -Hans</p></blockquote><p></p>