580B Broken tooth on Spur gear

XessReality · 2020-10-13T16:35:27.000Z

Hello All, Its been a bit since I posted last, but I read through this section quite often and I'm hoping someone here has some experience that could help me. Since i acquired my 580b its had an intermittent rotational tick in the rear end. It is most noticeable when moving at faster speeds and rarely is heard when moving slowly. When changing out the shuttle fluid and draining what looked like yellowish puke from the rear diff I went looking for a way to clean out the gunk from the rear end. After pulling off the rear access/pto cover i noticed something stuck in the sludge in the bottom of the case. I was hoping it was a wayward leaf or similar, but when a handheld magnet dragged out a single broken off gear tooth I knew I was in trouble. At first I couldn't figure out where it came from, but after narrowing down by shape and size, then getting an inspection mirror at just the right angle while a friend slowly rotated the wheels, I saw that it had relatively cleanly sheared off of what seems to be referred to as one of the spur gears. Its one of the smaller straight cut gears that directly drive the 2 big final drive gears on either side of the case. Question is, has anyone else had this happen or maybe can speculate as to what would cause this? after looking up the part it seems like that side is tied into the diff lock function possibly. Also, is this repairable without splitting the tractor? it seems like there is a removable side cover that hold this gears shaft in place.... Any info and relevant experience would be very helpful as a family friend suggested that the best option might be to simply fill it back up with gear oil and try not to strain it too much...

Started by XessRealityOct 13, 202044 replies

hosspullerJunior MemberJul 27, 2022#41
I had a shop that just didn't understand the preventive aspect of car repairs. I always said call me if there's a potential future problem. Answer the seal question yourself. How much effort will it take to replace the seal now, vs several months later?
TinkererSenior MemberJul 27, 2022#42
1" is ok. Don't screw the tap into the screen.
580BhoeJunior MemberMay 10, 2026#43
I have the same issue.....Left hand "rear differential side gear" (part A144338) has chipped drive teeth on it. The cause looks to be about 1/3 of the bearing Reece support (the shoulder) on the opposite, right side of the bearing carrier plate that's between the case and the brake housing (previous owner(s) must have broken it). I fished out all the parts and chipped teeth and the bull gears and the differential and ring gears look undamaged. My question is, if I pull both left and right side brake housings and bearing carrier plates is there enough room to move the ring gear with both left and right differential side gears attached forward and turn so it can be removed so I can do the work on the bench WITHOUT pulling the axle shaft partially out and the bull gear off?
BennettconstructionNew MemberJul 18, 2026#44
580Bhoe said: I have the same issue.....Left hand "rear differential side gear" (part A144338) has chipped drive teeth on it. The cause looks to be about 1/3 of the bearing Reece support (the shoulder) on the opposite, right side of the bearing carrier plate that's between the case and the brake housing (previous owner(s) must have broken it). I fished out all the parts and chipped teeth and the bull gears and the differential and ring gears look undamaged. My question is, if I pull both left and right side brake housings and bearing carrier plates is there enough room to move the ring gear with both left and right differential side gears attached forward and turn so it can be removed so I can do the work on the bench WITHOUT pulling the axle shaft partially out and the bull gear off? Click to expand... I know it’s a few months past but no. The bull gears have to come off in order to remove the left and right final drives. Axles have to be pulled out just enough to drop bull gears and remove. After that the drives can be pulled out both sides and then planet/ring pulled out from top.
580BhoeJunior MemberJul 19, 2026#45
Bennettconstruction said: I know it’s a few months past but no. The bull gears have to come off in order to remove the left and right final drives. Axles have to be pulled out just enough to drop bull gears and remove. After that the drives can be pulled out both sides and then planet/ring pulled out from top. Click to expand... Thanks, I've pulled both Bull gears and have it all out on the bench now.

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