782 Diesel Problems

T

tobaccoman

Well-known member
Had two problems with my 782D today. First, after two rounds of mowing, the deck blades quit turning. Would not turn back on. So I headed back to the shop and while setting there idling, the second problem. The motor just quit running. When I tried to start it, nothing. The oil light on the dash wouldn't even come on. Anybody got any thoughts????
 
I'm not very familiar with the 782 but I'm assuming it has an electric PTO clutch and also an electric engine shut down solenoid? If that's the case, it sounds like an electrical issue, maybe as simple as a dead battery. When the battery got low, the PTO dropped out, then as it continued to drain, the shut down solenoid dropped out as well. Check the battery, cables and connections. It may be that your alternator has stopped working.
 
Thanks for your thoughts.
Was so disgusted I didn't check nothing. Hotter than blue blazes yesterday; gonna be about the same today, but I will tackle it anyway.
I do know for some time my battery has been shot. Been jumping it to start and it does fine. Will start with getting a new battery and go from there.
But couldn't understand why a diesel would quit because of no juice. Unless it has an electric fuel pump???
 
Yes, Gary nailed it for you. Either your battery is bad, not taking a charge, or the generator is not charging. The electric PTO clutch causes a constant drain on a battery, so if the charging system is bad, or the battery is bad, that is exactly what happens. First the PTO disengages (because there's not enough juice to keep the magnet engaged, and then, if it was a gas engine, the engine would eventually die because there's not enough juice to make spark. In your case, since it's a diesel, it kept running until you got back to the barn because the diesel engine doesn't really need electricity to make it run (compression ignition). It may have an electric fuel pump, so I'm guessing that's why it eventually died.

First take your battery to be load tested. If it passes, then your alternator is likely bad. If I remember right, the little Kubota engine has either a Bosch or Hitatchi alternator. Either way, not a big deal, either get it rebuilt, or may just be easier to find a new one online. In the meantime, if you charge your battery up good the night before, you'll be able to mow for a while each time, but it will eventually die out just like it did this time.
 
Gitractorman good to see you are still on here. I have been missing in action for a while but back on here again.
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On many modern diesels there is an electrical solenoid that controls the fuel shutoff at the injection pump. If the key shuts off your engine normally, that is how yours is set up.

When you idled the engine down as you pulled up to the shop, the voltage from the alternator dropped below what was needed to hold the fuel solenoid open, and it shut the engine down.

I agree that your battery finally gave up completely, but I will go one step further and surmise that your battery failed shorted, about the time the mower deck quit. The battery starts soaking up all the electrical energy the alternator can produce, and the voltage drops. Hopefully it didn't burn out the regulator from being overworked.
 
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