I sent an inquiry yesterday and got a response directly from Kubota today. That's good service!! Although they didn't specify the serial number range affected, mine was not. Mine is a 2007 model
L4400. Here is Kubota's response and my inquiry.
"Dear Glenn,
Thank you for your email to Kubota. Your L4400DT-F with the serial number
of 55910 hasn't been effected with any recalls. The PTO valve housing
recall was issued only on our L4400DT and L4400DT-1 models.
Your Original Inquiry:
I'm hearing from other owners about a possible recall on the
L4400 series
for a PTO problem in that it slips under load.
Can you verify this recall and does it affect my tractor. If so, I'll
contact my dealer about it.
The tractor has been great so far. I bought it new in Dec 08.
Thanks,
Glenn in PA"
I would say an email to Kubota or a call to your dealer would tell you for sure.
Happy tractoring!!