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Had similar problems with my B7800 ... would suddenly die and then fail to start (no response to key). After leaving it alone for a few days, it would start and run just fine. Recently, it would start but then die when pressing the HST pedal. I performed all the fuel services you did...

And the answer is...... SEAT SAFETY SWITCH !! Yep, just as you suggested, the seat switch was the source of the problem. Obviously the switch was stuck in the open position (at least some of the time) causing the engine to kill when applying the pedal. Here is what I did. I pulled the...

Will do.....Thanks....I will respond next week when I return to the unit....

I will try to post two short Movies of the tractor dying when pushing the HST pedal (with the clutch engaged or disengaged, whether in neutral or in Medium gear....makes no difference) See if these links will display a movie [via DropBox]. Lets see if this works.... Movie 1...

As for the seat switch, here is a photo of the wiring. I only see one switch...but will consult the WSM for official details: Click the thumbnail to see the attached jpeg....

Got it..... B2410_ B2710_ B2910_ B7800_9Y011-13031[1] WSM.pdf Seems this WSM covers multiple models, including the B7800 The PDF is about 400 pages....so will take some time to sort through, but great to have this resource....Thanks.

Thanks again. Will check the seat switch wiring after I get your info. If not the seat wiring, then I will be interested to know if the problem could be either a malfunctioning HST pedal switch or the shut-off solenoid ... and how to go about troubleshooting these. The tractor is running...

Wolfman: Thanks. As I suspected ... no correlation with transmission oil level. FYI the seat switch has been disarmed for years. The HST pedal switch is suspect. We have had trouble with this same tractor suddenly engine killed when put into forward/reverse, but in those prior...

Kubota B7800 with bucket, counterweight. Drove heavy (8 hours/day) in recent snow. Then engine died when applying forward or reverse on the rocker switch. Engine would still start easily, idle without dying, and respond (increase RPMs) to the throttle in normal fashion. However, as...