Engine wear hydro vs gear

[BotaBigot]

This is a known problem when text is composed in a word processor like Word then pasted into a post. Anything I compose is done as a text file in Notepad.

A mechanic could determine if there was a gear or a hydro behind an engine with the same accuracy as looking at a car engine and determining, by engine wear, if the vehicle had a manual or automatic transmission.

Word processors use unprintable codes to work their magic like indenting, tabbing, fonts, etc...which are in the document along with the stuff you can see. When such documents aren't converted from their native word processor "language," the unprintable codes often show up as...well...unprintable (garbage).

Probably about the only thing a mechanic could look for would be crankshaft end play (thrust bearing wear) from clutching, but even that's questionable. Or, he could cheat and look for a pilot bearing.

 

[tomd999]

Hiya,

In my experience with engines, there could, that's COULD be more wear on a gear trans engine than a hydro.

For my theory to pan out we have to make 2 assumptions, that a gear trans tractor has a clutch design that when disengaged, imparts thrust onto the crankshaft not unlike an American car/truck from say the '60's and that the hydro configuration is not unlike a typical automatic transmission car/truck with a non lock-up torque converter.

The first part of my theory is as such:

Since the disengaging of the clutch imparts significant thrust loads on the crankshaft, the rear surfaces of the thrust bearing would show significant wear. This is what I have seen in manual transmission vs automatic cars. I surmise that the same could be true with tractors.

The second part is that the usage habits of operators with gear tractors may actually cause more plain bearing wear because they tend to load the engine more at lower RPM when, because of the low RPM, the oil pump is not providing optimum pressure or volume thus making it easier for the oil film to shear and allow direct contact. I have seen accelerated main and rod bearing wear on engines that were in manual transmission cars/trucks that were "short shifted" thus keeping engine RPM low while loading the engine more to compensate.

Now, I don't claim to be an "expert" I'm only relating what I have seen with my eyes over the years.

Tom

 

[dirtworksequip]

Chris and his 81 year old neighbor have identical tractors except one is hydro and the other is gear and have agreed to a pull off, drawbar to drawbar. They also have agreed to sacrifice their tractors in the name of science and to settle the gear vs. hydro argument once and for all. They are going to pull and pull and pull and when the smoke clears we will have the devine answer. Hence forth after the winner is declared,there shall be no mention of gear vs. hydro on the tractorbynet site. Let it be said, anyone violating such as to mention gear vs. hydro shall be banned from this site forever.

Sincerely, Dirt

disclaimer: I am not responsible for anything I say.

 

[john_bud]

Ok, now that that is settled, which wears the engine faster, 4wd or 2wd?

jb

 

[DreaminGreen]

I thought it was going to be on pay-per-view also!

 

[dirtworksequip]

hmmmmm, hadn't thought about pay per view. Think we could generate enough interest and revenue to buy Chris and his neighbor brand new cab tractors? After all we don't want them to think in was all in the name of science.

Sincerely, Dirt