3205 rear issue

Oak · #1 07-06-2018, 07:16 AM

Pulled apart my 3205 for an oil leak and noticed some wear on the spur gear & output shaft. What would cause this? Do you see any issues if I don't change anything?
DSCN3958.jpg DSCN3967.jpg

The oil was old (19 years old)

so maybe that didn't help the issue either.
DSCN3949.jpg

Here is a peak inside an aluminum locking rear.
DSCN3951.jpg

Terry C · #2 07-06-2018, 08:56 AM

Sorry to derail Todd but your pic says Al rear. I was looking at a 3200 and it said Cast Iron. They look similar. I’ve been thinking about one of these with a smaller deck to leave at the shop instead of hauling a 2182 back and forth.
Just wondering. Sorry again for the derail.

J-Mech · #3 07-06-2018, 09:14 AM

Quote:

Originally Posted by Oak

Pulled apart my 3205 for an oil leak and noticed some wear on the spur gear & output shaft. What would cause this? Do you see any issues if I don't change anything?

That wear is odd in that it is only on one side of the gear. That type of erosion can be caused by contamination, or a factory defect of the gear not being hardened correctly. The excessive metal in the rear wasn't helping.... and is obviously the metal from the gear. I'm shocked it didn't plug up the filter. Kind of makes me wonder what kind of shape the hydro is in. Being that it is worn just on one side, it might be a gear alignment issue. Are the "bearings" in good shape? Shafts don't move (rock) when they shouldn't do they?

You have a few choices:

You can flush the rear and put it back together and hope for the best. If you do that I suggest changing the oil again and looking things over inside in 50 hours or so.

You can pull the rear end apart and flip the ring gear so it wears on the opposite side. I can't see what kind of shape the pinion shaft is in, and you can't flip it anyway. If nothing else, it may slow down the progression of the failure.

Or.... you can replace the ring and pinion gears. That would be a sure cure, if it isn't a misalignment of the shafts.

If it was mine..... I'd sell it.

But the only reason I would own a 3205 is to flip anyway. I'm not impressed with them. That's a lot of metal in the rear!

Oak · #4 07-06-2018, 09:19 AM

Terry, they switched to the CI rear in November of 2000. My 3205 was built on April fools day of 1999(actual build date) and has the aluminum rear.

The GT3200 is nice but I'm pretty sure it won't compare to 3 cylinder Kubota gas burner.

Oak · #5 07-06-2018, 09:29 AM

Thanks Jon. I only got as far as pulling the cover off the rear and didn't check the bearings or anything else yet. I was also thinking some type of alignment issue. I'll see if I can get some pics of the other gears and bearings.

I did a 3165 a few years ago and looked at those pics and the gears look new so something "ain't" right in this one.

Oak · #6 07-06-2018, 09:40 AM

Here is a pic of the pinion gear.
DSCN3965.jpg DSCN3966.jpg
Here is the bevel gear.
DSCN3968.jpg

J-Mech · #7 07-06-2018, 09:53 AM

I was talking about the pinion gear that drives the main bull gear. I think the book calls it a spur gear. The small one that drives the big one that is attached to the axles. I would call it a bull pinion gear. The last pic you posted shows it pretty good. But I still can't see if it is eroded on one side like the big gear is. Doesn't appear to be.

TNTs CC · #8 07-06-2018, 10:11 AM

Quote:

Originally Posted by Oak

Pulled apart my 3205 for an oil leak and noticed some wear on the spur gear & output shaft. What would cause this? Do you see any issues if I don't change anything?

I think some units might have had issues with that gears mounting bolts come loose. I'd want to check them and re-loctite them. Maybe a previous owner had them come loose and retighten them before you got it.

Just a thought.

TNTs CC · #9 07-06-2018, 11:58 AM

Quote:

Originally Posted by Terry C

Sorry to derail Todd but your pic says Al rear. I was looking at a 3200 and it said Cast Iron. They look similar. I’ve been thinking about one of these with a smaller deck to leave at the shop instead of hauling a 2182 back and forth.
Just wondering. Sorry again for the derail.

They are a nice tractor, the newer ones like a GT3200 have the updated charge pump and the cast iron rear. It's not a 2182 but odds are you'd like it. They sure do mow nice and the foot operated pedal hydro is nice too.

Terry C · #10 07-06-2018, 03:51 PM

Quote:

Originally Posted by TNTs CC

They are a nice tractor, the newer ones like a GT3200 have the updated charge pump and the cast iron rear. It's not a 2182 but odds are you'd like it. They sure do mow nice and the foot operated pedal hydro is nice too.

I don’t expect it to be as nice as my 2182s. But I need something that somebody else can use. I don’t trust anybody on the 21s. I rebuilt and rewired them completely, and there is no safety switches anywhere. Nor do I keep the belt guards on the deck, just a place to collect clippings.
So user friendliness is what I’m after. I don’t want to worry about somebody damaging the 21s, they kinda are my babies.