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Gleaner52 
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 Topic: 7040 Differetial Rebuild
Posted: 14 Feb 2024 at 7:35pm |
Got the 7040 split today and started the process of disassembling the rear end. Almost every tooth on the ring gear has a piece broken out of it. Pinion and spider gears look fine. I am going to replace the ring and pinion and thoroughly inspect everything else. Other option was to swap entire rear with a salvage unit but repairing what I have is cheaper and I will know what I have.  
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Lynn Marshall
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Posted: 14 Feb 2024 at 10:24pm |
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MrSnerdly
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Posted: 15 Feb 2024 at 11:52am |
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That has to be unusual. I have never seen a ring gear fail, always the pinion. Makes sense when you figure how many more times the pinion teeth make contact compared to the ring gear.
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SteveM C/IL
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Posted: 15 Feb 2024 at 11:15pm |
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Wouldn't it take a bad bearing or two letting things run out of place to break teeth like that?
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DrAllis
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Posted: 16 Feb 2024 at 3:29am |
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Can't see everything, but I think there was a heat treat problem with the ring gear. There's one tooth that looks terrible with good looking teeth on each side of it. That's a manufacturing flaw.
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plummerscarin
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Posted: 16 Feb 2024 at 7:38am |
Hmmm, ought to be able get repaired under warranty then huh? 
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tbran
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Posted: 16 Feb 2024 at 10:10am |
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Yup, just call AC in Milwaukee and ask for the warranty dept :-)
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When told "it's not the money,it's the principle", remember, it's always the money..
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Gleaner52
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Posted: 16 Feb 2024 at 12:45pm |
 DrAllis wrote:
Can't see everything, but I think there was a heat treat problem with the ring gear. There's one tooth that looks terrible with good looking teeth on each side of it. That's a manufacturing flaw. |
Seems unlikely, would have failed long before now if that were the case.
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NEVER green
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Posted: 16 Feb 2024 at 2:09pm |
Looks to me like they got the heat treatment on the pinion gear correct, its hardly touched considering what it was up against.
Its not oil, heat treatment.
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2-8050 1-7080 6080 D-19 modelE & A 7040 R50
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I M Fedup
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Posted: 16 Feb 2024 at 2:28pm |
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Anything you can share on the maintenance history of the tractor? As in any repairs involving major tear down of the rear end to where the ring and pinion adjustments may have been worked on? Maybe even before you owned it? I'm surprised at what appears to be so much wear on the faces of the teeth. Maybe it's just my poor eyesight mixed with photo blur, but that seems unusual to me. Any photos of the pinon teeth?
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DrAllis
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Posted: 16 Feb 2024 at 3:58pm |
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As I said, I cannot see everything BUT there is clearly one tooth on that ring gear that looks terrible and the teeth on each side of it look pretty decent. Explain that with something other than lack of heat treat/harness issues.
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AC720Man
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Posted: 16 Feb 2024 at 5:09pm |
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Wow that’s a lot of damage. Where did all that debris go?
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Gleaner52
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Posted: 16 Feb 2024 at 5:54pm |
DrAllis wrote:
As I said, I cannot see everything BUT there is clearly one tooth on that ring gear that looks terrible and the teeth on each side of it look pretty decent. Explain that with something other than lack of heat treat/harness issues. |
Every tooth has a piece out of it, worse chips were most likely caused by debris being carried around the teeth.
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Gleaner52
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Posted: 16 Feb 2024 at 5:55pm |
AC720Man wrote:
Wow that’s a lot of damage. Where did all that debris go? |
The prices were in the bottom of the housing.
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Gleaner52
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Posted: 16 Feb 2024 at 5:56pm |
Gleaner52 wrote:
DrAllis wrote:
As I said, I cannot see everything BUT there is clearly one tooth on that ring gear that looks terrible and the teeth on each side of it look pretty decent. Explain that with something other than lack of heat treat/harness issues. |
Every tooth has a piece out of it, worse chips were most likely caused by debris being carried around the teeth. |
There are also teeth broken on the final drive ring gear.
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MrSnerdly
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Posted: 16 Feb 2024 at 6:40pm |
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I imagine you will be getting salvage parts rather than new. New would be very expensive, I would think, especially considering you need a final drive ring gear in addition to the R&P.
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Gleaner52
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Posted: 16 Feb 2024 at 8:26pm |
MrSnerdly wrote:
I imagine you will be getting salvage parts rather than new. New would be very expensive, I would think, especially considering you need a final drive ring gear in addition to the R&P. |
Yes, I will be getting used parts with the exception of needed bearings.
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DougG
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Posted: 17 Feb 2024 at 5:53am |
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Just an observation- and my opinion- was everything set up inline with the whole pinion and ring gear to engage ? Seems about 3/8, inch was doing all the work, maybe I missed a post
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Les Kerf
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Posted: 17 Feb 2024 at 7:30am |
DrAllis wrote:
As I said, I cannot see everything BUT there is clearly one tooth on that ring gear that looks terrible and the teeth on each side of it look pretty decent. Explain that with something other than lack of heat treat/harness issues. |
That was my first impression; too hard.
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Lynn Marshall
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Posted: 18 Feb 2024 at 9:15am |
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Those rear end assemblies are usually bullet proof. However, occasionally, stuff happens. This is an 8030 differential carrier that I was into several years back. It needed the carrier and spider gears, but the ring and pinion were good. One hell of a mess to clean up the oil contamination.
