I have a 2005 T300 turbo high flow 2170 hours. Bought from an equipment rental company in Main/NH last year with 2110 hours. Has been running/working great around my yard. All of a sudden today I lost hydraulic pressure, got an error code 05-15 and message Hydraulic charge pressure in shutdown, and machine shut down. I can restart but there is still no use of hydraulics. If I try to move the machine it somewhat appears to want to move (although weakly) but the tracks appear locked. I checked the hydraulic reservoir and its full. There's no apparant leaks. The drive belt looks fine. Pulled the filter off and it was only half full. It looks as if the pump may have just stopped pumping. Any thoughts on what to check or try would be helpful. Would it be possible for the pump to fail suddenly with no prior warning signs or symptoms? I've been using the machine daily for weeks with no lack of power or anything. Thanks for your thoughts and suggestions.