B2410 Seized Alternator, Smoked Fan Belt

[NoJacketRequired]

Well wouldn't you know it... I set out to spend a day at the airport cutting grass. Got the runway cut then started cutting the tiedown area. Suddenly there was a squeal, a puff of smoke and the alternator light came on.

Thinking the water pump had seized I shut down the PTO, cut the revs down and hightailed it in a straight line for the hangar.

Subsequent inspection revealed the alternator had seized and in doing so had smoked the fan belt.

I've got the alternator off. I don't have the WSM for the 2410 but have it for my B7510 tractors. I don't know how common these alternators are across the various models.

I'm reaching out here today with two simple questions since I haven't been able to find the answers using the search function on this forum.

1) does anybody know the part number for the B2410 alternator (or I guess more appropriately, dynamo) and is it the same as the device on the B7510?

2) what's the quickest and most direct means by which to get the old fan belt off and a new one installed? I'm trying to figure out what all has to be removed to get the fan blades clear of the fan housing behind the rad.

Thanks in advance for what I know will be your very helpful replies.

 

[eserv]

Well wouldn't you know it... I set out to spend a day at the airport cutting grass. Got the runway cut then started cutting the tiedown area. Suddenly there was a squeal, a puff of smoke and the alternator light came on.

Thinking the water pump had seized I shut down the PTO, cut the revs down and hightailed it in a straight line for the hangar.

Subsequent inspection revealed the alternator had seized and in doing so had smoked the fan belt.

I've got the alternator off. I don't have the WSM for the 2410 but have it for my B7510 tractors. I don't know how common these alternators are across the various models.

I'm reaching out here today with two simple questions since I haven't been able to find the answers using the search function on this forum.

1) does anybody know the part number for the B2410 alternator (or I guess more appropriately, dynamo) and is it the same as the device on the B7510?

2) what's the quickest and most direct means by which to get the old fan belt off and a new one installed? I'm trying to figure out what all has to be removed to get the fan blades clear of the fan housing behind the rad.

Thanks in advance for what I know will be your very helpful replies.

Provided there is no other damage you can replace the bearings in the dynamo and be as good as new again! Usually you can work the new belt over the fan blades without actually taking anything apart.

 

[Roadworthy]

I'll go along with what eserv said but add that the bearing is usually a common item - not special to Kubota. There is a number on it which tells what it is. Any place that sells bearings should be able to provide a new one. As far as the fanbelt goes, if you have removed the alternator you're halfway there. An auto parts store should be able to provide a replacement. They're a pretty common item, too.

 

[thebicman]

I looked up the two models in the Kubota parts lookup and they both appear to be the same. As already stated you should be able to replace the bearings as long as there's no other damage.

 

[NoJacketRequired]

Thanks for the helpful responses.

I was afraid the bearing seizure had caused other problems in the dynamo. I've been able to get it turning again by hand so that's a good sign.

As for the fan belt, there's no way it will come out past the ends of the fan blades - the clearance between the fan and housing is about half the thickness of the belt. I'm thinking I'm going to have to get the fan housing loosened off so it can move toward the ending and maybe buy enough additional clearance to get the belt past the blades.

Hopefully tomorrow I'll get the dynamo pulled apart to take a look for any damage beyond the bearing itself. Fingers crossed!

 

[Roadworthy]

I'm not familiar with your tractor but look at the radiator mount. You may be able to loosen or remove the mounting bolts to achieve enough play to pull the top of the radiator forward to allow the belt to clear the fan and shroud. You may have to rotate the fan to work the belt through the largest opening.

 

[motorhead]

To get a fan belt off that is smaller in diameter than the fan, you take the fan belt and by hand, pull it over one fan blade at a time towards the radiator. Usually you only have to pull it over two fan blades before it will come off. I tried to replace bearings in a dynamo once and I couldn't get them out. I ended up replacing my low amp Dynamo with a Kubota alternator.

 

[NoJacketRequired]

I spoke with one of our local dealers today. The bearings for the dynamo are relatively inexpensive - I was told there are three identical bearings. Each is under CAD$10.

The replacement dynamo is $231.

Since I need to have the tractor up and running before the weekend, and both Tuesday and Wednesday are already fully booked for me, I figured it wisest to order the replacement dynamo AND the bearings. I'll install the new dynamo and once this particular time crunch has passed I'll try replacing the bearings in my seized dynamo.

As for fan belt replacement, the challenge isn't with the length of the belt but rather its thickness as there is precious little clearance between the fan and the fan housing, not nearly enough to let the belt slip past the end of the fan blade. I've got a fair bit of disassembly that's required in order to get the fan housing to move far enough so it's not going to interfere with removing the belt. That's the job for Thursday...

 

[whitetiger]

I replace at least a dozen belts on B 10 series tractors a year. Only takes a couple of minutes to install the belt over the fan and onto the pulleys. It is a plastic fan blade and the tips deflect as you pull the belt over them. If you want to loosen the fan shroud it is only 4 10mm headed bolts that are easy to access.
You are putting wayyyyyyyyyyyyyyyyy to much thought into this very simple task.

 

[NoJacketRequired]

Well, as it turned out, the solution was indeed far more simple than it originally seemed. The fan shroud is slightly out of alignment with the fan itself. When I was looking at it I was standing on the left side of the tractor where the dynamo is located. On that side there is little clearance between the blades and the shroud. Not surprisingly, on the opposite side there was enough clearance to pull the fan belt out past the fan blade tips.

As was mentioned above, it only took a minute or two to change the fan belt once I found the sweet spot.

Of course changing the dynamo was dead simple, maybe a 5 minute job.

I managed to get about a half hour of grass cutting done before I was out of time today. Will re-check belt tension before I start my next grass cutting session.

Thanks to all who provided helpful comments.

For future reference, the part numbers involved are as follows:
1 each 1624197013 Belt, Fan, 37, Cogged
1 each 6C04059252 Assy, Dynamo
3 each 1553174180 Bearing, Ball (these are the bearings which will be used to rebuild my seized dynamo)

 

[twomany]

When you get those bearings, post the series number.
I'm sure they are something very common and available through many sources.

The number will be on the seal or the races. R8's would have a 1/2 inch shaft bore, 6301 would be a metric 12 mm bore , in example.