Baker, you better start searching now. There are NO cranks in North America. The only way to get a crank now is to buy a parted out tractor. And to date there's nothing on ebay. edit: Check this! A crank in China. You better contact the seller fast!
https://www.alibaba.com/product-det...spm=a2700.7724857.normalList.8.62651e15JToMpV
It took me a lot of searching for parts and here's a couple sources.
Here's a parts list with the correct part numbers. Yes it's tor the hydrostatic transmission version but all engine part numbers are correct and current. Login with your email addy to view it.
https://www.messicks.com/ku/84573
There is a gasket that holds the rear main to the rear main cover which is NLA. You'll have to make one as I found the last one in America. Make it from .010-.012 thick material. The gasket to hold the cover to the block is available.
Bearings for mains and rods will be sourced from this company in Australia or this one in Cyprus. Kubota doesn't have all the mains, only standard rod bearings. Both companies are super to work with.
For the Aussie company they're listed by engine model, ZL600
http://www.kubotaparts.com.au/index.php?route=product/category&path=12 Pay the extra for fast shipping, about 4-5 days. My undersize rods and mains cost ~ $130 shipped.
* I have a set of std rods and mains if you need them. My crank was ground to .25-.25, or .010"
Cylinder sleeves came from Stavros Sava in Cyprus.
https://www.stavros-savva-co-ltd.com.cy/parts-filter/?make=1&model=36&cfm=Kubota&cfmo=B6000 They ship fast!
There is a B6000 rebuild kit from China on Ebay.
https://www.ebay.com/itm/ZL600-Over...680057?hash=item3b3430bdf9:g:DZUAAOSwgMxdFfOJ Note that by the picture the sleeves look wrong. They appear straight whereas you would bore the factory sleeve to fit these. I would recommend sleeves from Stavros Sava as they're drop in wet sleeves and a clone of OEM.
I'll post more as today starts the build up.