MANUALS, REFERENCES, ETC.
If you're in the same boat as I am -- wrenching on one of these old little Kubotas -- there's a chance you're in need of some reference manuals. Kubotabooks.com is a great reference, but the sheer traffic that site draws means it frequently goes down for the count. Well, I hope I can help. If you have a B5100, B6000, B6100, or B7100, here's some reference material for your use.
B6000 Service Manual
B5100, B6100, B7100 Owner's Manual (B6000 controls are similar)
B6100 HST, B7100 HST (Hydrostatic) Owner's Manual
B6000, B5100, B6100, B7100 Service Manual, Pt. 1
B6000, B5100, B6100, B7100 Service Manual, Pt. 2
B6000, B5100, B6100, B7100 Service Manual, Pt. 3
B219 Loader Owner's/ Parts Manual
I did recently pick up a B5100/B6100/B7100 "Technical Manual" that has more service detail than the Owner's Manual, but isn't as comprehensive as the official Kubota Workshop Manual (WSM). I'm working on digitizing this as time allows.