There are mower places out there that refuse to work on a Diplomat 430/590 because of the time taken to perform routine maintenance...they are labour intensive and most owners baulk at the quote.

It is not only the nylon ring gear that is the problem...the build quality is not as good as the SB45....very few parts are available and the parts available for the SB45 (which is all parts) are not compatible with the Diplomats. wink

The SB590 is 17" cutting width.

Re: the plastic caps, with mine, I just drilled a 1/8" hole on an angle through the roller cap, so as can squirt some oil in...that keeps the cap and shaft lubricated.
It works a treat! grin

BTW, more SB 45's were sold in WA than in any other state..and second hand machines over there sell for high prices and are highly sought after. wink
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin