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Pull the end off and check the brushes and commutator.

A quick look at parts shows your sensor screwed directly into the housing. Run 2 filters, and check for inlet restrictions.

I don't know your tractor, but check there is a hose from your sensor connected to both sides of the filter housing to measure it's differential pressure. If a hose is missing it will put the light on early.

Nice, but it doesn't load test it! Then while its running get a long piece of 4 x 2 and lever between the bench and the starter drive gear and chew the shit out of the wood, simulating a decent load onto the drive gear. This proves the planetries and clutch if it has them, and load tests the...

And of course don't forget the basics, that the belt is clean and tight!

Drain a pint of fluid from the drain cock on the bottom of the radiator into a clean white bucket, do this with the radiator cap off to allow the quickest flow. This should allow you to see if there is any crud in the bottom tank. The main things that happens to coolant is the additive package...

You can get a full parts manual with part numbers from Messicks for free by going to their page and requesting the pdf files to be sent to you. Go here, and click on the "Parts diagrams" tab and go from there http://www.messicks.com/wiki/kubota/m4500

I'm guessing you are replacing hoses? Just pull the old hose out with a strong draw wire attached, get new hose made up sames as old, then use the wire to pull the new one in?

Could some have been driving around on bitumen or concrete with the diff locked?

Check the oil, level, and traces of coolant, check the radiator fluid, if it was low it may have overheated and become tight. Ensure all transmission/hydraulics neutral selected, not engaged and clutch depressed, (once you get the electrical fixed,) how does it go cranking with decompressor...

Sorry to hear Ken, please keep us posted as to how/why, if you can ascertain anything. Some pics are always nice, even though there's nothing nice about the whole deal.

Thanks, Messicks USA (and probably others wont sell to OZ), a couple on ebay at $175(used) and $210(new) delivered, I'm hanging out for a cheap one. I won't count my chickens till they hatch, but I've had a promising offer of one, will let you know how it goes! The 1710/2110/2410/2710 link is...

Nice work/repair so far, what else is cactus on it?

Yikes Ken, Sounds expensive right from the first squeal! I think it would be worth talking to the dealer/Kubota head office, as you took it to them 3 times with the problem and they failed to diagnose or rectify the problem before it died. I would try to handball it to them, and you may have to...

http://www.tractordata.com/backhoe-loader/000/1/4/147-kubota-b21.html https://www.youtube.com/watch?v=nbxYSECBcJk I'm hoping I can find a manual on the HST and hydraulics from another tractor which are the same as a B21. Generally they would use an engine and/or HST in a few different tractors...

Hi folks, I'm chasing info on a B21 (TLB), I'm wanting to know if a B21 is really a B2110 plus the bucket and hoe? Reason, I can't find a WSM on a B21, but there are others around including a 1710/2110/2410/2710 combined manual and am wondering if it's exactly the machine hiding under the B21...