Faunsdale, AL | ronm - 2/4/2025 23:10
Which gear is it? I remember early 4010 had a problem with the rear most gear, 1&3. I will have to read the book and old service bulletins in the morning, it's bedtime now...
Looking at the parts book picture, it appears the 1-3 gear is the only one that runs on a section of round shaft. So that would be good for least wear because of the contact area but bad if clearance was too tight or lubrication failed. The rest of the gears spin on the broad tops of the splined section of the shaft, so less contact area to spread the wear over, but more space for oil retention.
Why did the 2-5 gear seize? Lack of lubrication most likely as evidenced by the discoloration.
How can it build up heat? The bottom shaft spins fastest in high range/8th gear and while it’s in 8th, of the unloaded gears that are spinning on the shaft, 1-3 has the greatest speed differential, but it’s also the gear closest to the oil pipe. Next greatest rpm differential would be 2-5. It’s closer to the oil supply than the front 4-7 gear, but also the spinning gear (when tractor is in 8th) that would have gotten more metallic debris from the brakes collected in it over the years.
most tractors have a worse worn 5th gear and high/2nd reverse than any other gears so that could have contributed to the problem somehow.
Probably just a crap shoot which seized first when lubrication ran short.
The suggestion of a replacement transmission/rear housing assembly might not be far off the mark. The brakes being failed long term might mean that there’s more parts than the seized gear with wear from the metal that the trans pump has been pumping over the years.
My 4320 resembles this tractor in lots of ways! Brakes out, trans pump replaced, lots of hours………. Amazingly its shifters are pretty tight, so I doubt it had a loader on it for long before we got it and put one on. |
update on 'stuck' 4010 transmission
