| Author |
 Topic Search  Topic Options
|
Gleaner52 
Bronze Level
Joined: 15 Dec 2023
Location: Illinois
Points: 20
|
 Post Options
 Thanks(0)
 Quote  Reply
 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.  
|
 |
|
Sponsored Links
|
|
|
Lynn Marshall
Orange Level Access
Joined: 13 Sep 2009
Location: Dana, Iowa
Points: 2282
|
Post Options
Thanks(0)
Quote Reply
Posted: 14 Feb 2024 at 10:24pm |
|
|
|
MrSnerdly
Bronze Level
Joined: 11 Jan 2024
Location: fairbury ne
Points: 65
|
Post Options
Thanks(0)
Quote Reply
Posted: 15 Feb 2024 at 11:52am |
|
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.
|
|
SteveM C/IL
Orange Level Access
Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8235
|
Post Options
Thanks(0)
Quote Reply
Posted: 15 Feb 2024 at 11:15pm |
|
Wouldn't it take a bad bearing or two letting things run out of place to break teeth like that?
|
|
DrAllis
Orange Level Access
Joined: 12 Sep 2009
Points: 20478
|
Post Options
Thanks(0)
Quote Reply
Posted: 16 Feb 2024 at 3:29am |
|
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.
|
|
plummerscarin
Orange Level Access
Joined: 22 Jun 2015
Location: ia
Points: 3451
|
Post Options
Thanks(0)
Quote Reply
Posted: 16 Feb 2024 at 7:38am |
Hmmm, ought to be able get repaired under warranty then huh? 
|
|
tbran
Orange Level
Joined: 14 Sep 2009
Location: Paris Tn
Points: 3291
|
Post Options
Thanks(0)
Quote Reply
Posted: 16 Feb 2024 at 10:10am |
|
Yup, just call AC in Milwaukee and ask for the warranty dept :-)
|
|
When told "it's not the money,it's the principle", remember, it's always the money..
|
|
Gleaner52
Bronze Level
Joined: 15 Dec 2023
Location: Illinois
Points: 20
|
Post Options
Thanks(0)
Quote Reply
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.
|
|
NEVER green
Orange Level Access
Joined: 28 Feb 2013
Location: MN.
Points: 7478
|
Post Options
Thanks(0)
Quote Reply
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.
|
|
2-8050 1-7080 6080 D-19 modelE & A 7040 R50
|
|
I M Fedup
Bronze Level
Joined: 01 Jul 2020
Location: Winchester Ky
Points: 28
|
Post Options
Thanks(0)
Quote Reply
Posted: 16 Feb 2024 at 2:28pm |
|
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?
|
|
DrAllis
Orange Level Access
Joined: 12 Sep 2009
Points: 20478
|
Post Options
Thanks(1)
Quote Reply
Posted: 16 Feb 2024 at 3:58pm |
|
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.
|
|
AC720Man
Orange Level
Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 4910
|
Post Options
Thanks(0)
Quote Reply
Posted: 16 Feb 2024 at 5:09pm |
|
Wow that’s a lot of damage. Where did all that debris go?
|
|
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
|
|
Gleaner52
Bronze Level
Joined: 15 Dec 2023
Location: Illinois
Points: 20
|
Post Options
Thanks(0)
Quote Reply
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.
|
|
Gleaner52
Bronze Level
Joined: 15 Dec 2023
Location: Illinois
Points: 20
|
Post Options
Thanks(0)
Quote Reply
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.
|
|
Gleaner52
Bronze Level
Joined: 15 Dec 2023
Location: Illinois
Points: 20
|
Post Options
Thanks(0)
Quote Reply
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.
|
|
MrSnerdly
Bronze Level
Joined: 11 Jan 2024
Location: fairbury ne
Points: 65
|
Post Options
Thanks(0)
Quote Reply
Posted: 16 Feb 2024 at 6:40pm |
|
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.
|
|
Gleaner52
Bronze Level
Joined: 15 Dec 2023
Location: Illinois
Points: 20
|
Post Options
Thanks(0)
Quote Reply
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.
|
|
DougG
Orange Level
Joined: 20 Sep 2009
Location: Mo
Points: 8106
|
Post Options
Thanks(0)
Quote Reply
Posted: 17 Feb 2024 at 5:53am |
|
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
|
|
Les Kerf
Orange Level
Joined: 08 May 2020
Location: Idaho
Points: 777
|
Post Options
Thanks(0)
Quote Reply
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.
|
|
Lynn Marshall
Orange Level Access
Joined: 13 Sep 2009
Location: Dana, Iowa
Points: 2282
|
Post Options
Thanks(0)
Quote Reply
Posted: 18 Feb 2024 at 9:15am |
|
|
|
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.
