Ok so I have a 2011 B3300 with 235 hours on it. Most of the hours have been spent running a finish mower on my three acres of lawn to mow. I was removing top soil to add onto our deck this week and the loader bucket stuck in the dump mode and lever would not budge. I took the valve body apart to find a load check valve stem has broken off and jammed into the spool valve. I had to beat the spool valve out with a punch marring the spool valve and damaging the seal when removing. I called the dealership and they want over $1000.00 for a new loader valve body and for just the load valve they wanted $75.00 and $80.00 for 1 rubber seal. So in order to try and save $1000.00 I spent 8 hrs buffing the spool valve with a crocus cloth. Ordered a new valve and a seal. When the valve arrived I found the replacement valve to be almost twice as thick and longer. Since Kubota redesinged the part it to me is an admission of a known problem. I cannot believe Kubota does not take resposibily for these know faulty parts and replace the valve body free of charge or at least at cost. This is my second Kubota and probably my last after this experience. If you have a LA504 loader I would certainly replace the load check valves ASAP with the new updated part for $75 befor you have to purchase a new Valve body for over $1000.00. Very easy to replace just the load check valves and it will save you allot of money!!!! 
