Henro
Super Member
- Joined
- Jul 4, 2003
- Messages
- 5,001
- Location
- Few miles north of Pgh, PA
- Tractor
- Kubota B2910, BX2200, KX41-2V mini EX
This is just speculation but my experience with my Kubota tractors is that dynamos were rated lower than the alternator option as far as power output goes, and the 40 watt alternator was an option, which I purchased.
My guess would be, since your problem went away with the battery change that the problem was within the battery, and somehow the failed battery was loading down the dynamo, and therefore the dynamo output voltage dropped below the level needed to keep the fuel cutoff solenoid energized, so fuel was cut off.
There are two electrical schemes used by Kubota for fuel cutoff to shut down the engine with the key. One is they use a timer relay, and apply voltage to the fuel shutoff solenoid for several seconds when the key is turned to the off position. The other is the cutoff solenoid has two coils, and one is kept energized to keep fuel flowing through the injector pump, and a spring pushes the solenoid armature to cut off fuel when the key is turned to the off position, and voltage is removed from the solenoid.
IF you tractor has the second scheme, like my BX2200 does, then if voltage dropped for any reason the engine will shut down. But it will start if jumped, because the battery supplying the voltage is strong. But as soon as the jumper battery is removed the engine will shut down again.
That is my guess...based in some fact...don't know your tractor though...
My guess would be, since your problem went away with the battery change that the problem was within the battery, and somehow the failed battery was loading down the dynamo, and therefore the dynamo output voltage dropped below the level needed to keep the fuel cutoff solenoid energized, so fuel was cut off.
There are two electrical schemes used by Kubota for fuel cutoff to shut down the engine with the key. One is they use a timer relay, and apply voltage to the fuel shutoff solenoid for several seconds when the key is turned to the off position. The other is the cutoff solenoid has two coils, and one is kept energized to keep fuel flowing through the injector pump, and a spring pushes the solenoid armature to cut off fuel when the key is turned to the off position, and voltage is removed from the solenoid.
IF you tractor has the second scheme, like my BX2200 does, then if voltage dropped for any reason the engine will shut down. But it will start if jumped, because the battery supplying the voltage is strong. But as soon as the jumper battery is removed the engine will shut down again.
That is my guess...based in some fact...don't know your tractor though...