B7100 fan quit spinning

[grossgary]

the belt was riding around the fun pulley but the pulley/fan wasn't spinning. I assume the fan clutch or bearing is seized.

is it a bearing or a clutch?
and is that just a order it from Kubota deal or am is there a simpler method?

 

[Egon]

Chances are it is the dynamo that is seized. There is no clutch

Will you be doing the repairs yourself?

 

[grossgary]

Will you be doing the repairs yourself?

yes. what does the dynamo do? i guess the smiley indicates this isn't an easy job?

 

[Egon]

The dynamo is Kubotas terminology for alternator.

I have changed mine out for the same reason you probably have to change yours out. That means it's not very complicated.

If you do it yourself take the hood off, remove the rads and its real easy. There will be one bolt that is hard to access. My toolbox contains a bent combination wrench that will fit. Others have used one of the ratcheting box end wrenches with success.

The replacement dynamo will not be cheap.

You may be able to take the dynamo to a shop and have it rebuilt at a lower cost??

Now I am assuming it will be a seized dynamo. My trouble shooting skills are limited.

 

[grossgary]

doing a search i see guys mentioning that you can run the tractor on just the battery for quite some time.

since the B7100 doesn't have a water pump i don't have to worry about that - so does this mean i could finish my plowing/planting i was doing when the belt broke?

what all requires battery to operate once the tractor is started? is the fuel pump electrical in nature?

 

[Egon]

The fan has to be turning to keep the engine coolant cool and the hydro coolant cool.

You could run for quite a while on the battery or just boost as required.

I should have mentioned that the little bronze, on mine, round thing is the dynamo.

 

[grossgary]

The fan has to be turning to keep the engine coolant cool and the hydro coolant cool.

crap, i forgot about that. looks like they're only $150, so no big deal, except time.

 

[Egon]

A couple or three hours it took me. I'm slower than normal.

 

[grossgary]

A couple or three hours it took me. I'm slower than normal.

great thanks for the info, it should take me about the same!

out of curiosity - does the fuel pump or anything use electricity once it's started?

wondering how long it'd run if i could free the fan up and the battery was fully charged? a few hours?

 

[Egon]

Chances are it is the bearing in the dynamo that has seized up. It may be possible to get it loosened up.

As for the rest the only thing 12 volts is required for is starting. Everything else is mechanical. Once running it should go till it runs out of fuel.

That is a good time to check the bottom of the tank for debris!

 

[grossgary]

As for the rest the only thing 12 volts is required for is starting. Everything else is mechanical.

wow, that is awesome. these machines are insanely simple. thanks for the heads up!

 

[kthompson]

What sort of fuel shut off valve does the tractor have? Is electrical or mechanical? kt

 

[Egon]

Mechanical.

Called the throttle.

 

[dextersl]

OK, just to make sure I have this clear. I am experiencing the same issue on my 94' B7100HST. I removed the radiator and belt and manually turned the fan/dynamo until it started moving freely again. Based on your discussion I am assuming 1 of the following:

1. Debris somehow got caught up in the dynamo which caused it to freeze up, possible but maybe not likely?

or

2. The bearing has frozen and needs to be replaced, which may be the most likely case I am guessing.

If scenario 1 is true then I will have no further issues, but if not, then my battery will eventually die unless I charge it ever so often or at least put it on my battery maintainer.

It did not take too much effort to get it moving again by hand, so if it was a bearing problem should it have been significantly harder to get it moving again?

At this point can I assume, now that my fan can turn freely, that I should not have to worry about my tractor overheating any more? and that I can continue to use my tractor until I can either replace the dynamo or upgrade it to an alternator?

Thanks for the help on this.

 

[Egon]

[At this point can I assume, now that my fan can turn freely, that I should not have to worry about my tractor overheating any more? and that I can continue to use my tractor until I can either replace the dynamo or upgrade it to an alternator?/QUOTE]

Don't count on it. As soon as the bearing heats up it may seize again. Without the fan the tractor will overheat.