In my collection of documents I have an Operators Manual for a L185.
If you would like a copy, send me a Private Message with your email address and I will send it to you.
Kubotabooks.com has a free Workshop Manual.
http://kubotabooks.com/AutoIndex/in...s/&AutoIndex=60dc522d67081bc6b7f339b5292a14a1
From my quick read of the specifications for a L185, it has a single dry plate clutch was means your PTO is NOT "live." By live I mean it should keep running even when the clutch controlling tractor motion is depressed. Of course for the pto to rotate at all it must be engaged.
Others with more specific knowledge may correct this.
Carefully removing the top of the transmission may reveal a shifter fork out of position. This can happen from wear and heavy hand and often, once returned to the correct position, will work properly for years.
Dave