The nozzle for my rear window washer broke where it goes through the glass and when I went to replace it I found that it was hitting the cover for the cab inlet filter when the window was fully opened. I notched the housing to allow room for the nozzle and the problem is gone. Posting this as a heads up since warm weather is coming and folks might want to open the rear window. Kubota is really proud of the nozzle and charges $31 for it, so take a look to see if yours is hitting.
