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1975 3400 outer rear axle seal ??

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ptfarmer

11-16-2023 14:38:16




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On my 75 3400 (it has the locking differential) I'm seeing 2 different part numbers for the outer rear axle seals (part number 86531999) or (part number 86531244) I assume that one is for no diff lock, and the other one is ones with the diff lock (the NH online parts lookup is no help). Does anyone know which one I need, or am I going to have to take it apart first. Thanks




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Hobo,NC

11-19-2023 05:47:31




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
For someone that's never done this a post I made with a link on youtube of a guy doing a MF. Learn how to do the job correctly then you can proceed anyway your means fit the task at hand. This is not that hard to do but you can make it an expensive mess real fast.
Link



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Bern

11-19-2023 06:13:39




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 Re: 1975 3400 outer rear axle seal ?? in reply to Hobo,NC, 11-19-2023 05:47:31  
That's a slick tool you built for pressing the bearing and collar off. I don't have a picture to share of the tool I built, but it used a huge screw-type puller with like a 1'' pulling thread. It would give a 3/4'' impact gun a workout. We would usually heat up the collar a little with a torch while putting on the heat.



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Hobo,NC

11-19-2023 05:30:38




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
Please explain how you torch them apart.
I have rotated the collar with a air chisel to help relieve them. I found it was to easy to drill the collar than torture my set up as it was all my 20 ton press wanted. I am thinking when folks torch them they are cutting them apart so it takes skill to do that. BTDT its no fun at all.
I built two of these pullers one for N's and the other for other Fords its a piece of cake other than quite a bit heavy to get in the press for a old man.
I have a OTC puller buts its a job to get it assembled and wants to walk on the end of the axle. If I were to use it just for this job I could resolve that issue. Building the tools is part of the fun YMMV.

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Bern

11-19-2023 06:10:03




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 Re: 1975 3400 outer rear axle seal ?? in reply to Hobo,NC, 11-19-2023 05:30:38  
You asked a question and then answered it in the same post. You asked how you torch them apart. You then answered by saying it takes skill.

Yep.



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Hobo,NC

11-18-2023 09:33:36




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
I won't lie I have butcher those up with a touch. Its not that hard to make a tool to press it apart of course you have to have the ability and means to do it.
While you are butchering it up I will have it apart and save the bearing and race. While we are talking about saving money the bearing and race have value.
I don't work for cheap arses so don't have your problem. Its a good one not to have :) life is good.

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Bern

11-18-2023 20:26:46




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 Re: 1975 3400 outer rear axle seal ?? in reply to Hobo,NC, 11-18-2023 09:33:36  
While you are building the puller I could have 3 or 4 of them apart with a torch, without damaging the bearing or the axle shaft. I've built one of those pullers when I worked at the dealership, and I know from experience that whatever you build has to be super stout to pull the shrink collar and bearing off at the same time. Now that I no longer have access to that tool, the torch is the only way for me.

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Check Break

11-18-2023 09:25:16




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
Quoting Removed, click Modern View to see

To each their own as there's more than one way to do something. I'm sure the shop owned one of those Nuway pullers that are featured in the manual, but I never saw one. The issue was time. How much will the customer pay before they won't bring their tractor in for repair. The torch wrench removed the collar and bearing and warmed the new parts before install. The pipe was never used to drive anything down, but to tap (as needed) and hold in place. No need to use a BFH or the pipe like a fence post driver.

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Hobo,NC

11-18-2023 05:27:06




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
I had a few that were no problem are while pressing them off I thought I could have got the hub off without a press. I talked to ultradog while he was replacing his seals I though he said he got them off without a press. BTW if you ever do one that uses the collar weld the old collar to a pipe they make a good knocker to drive the bearings on.
Of course you could damage the bearing by trying to drive it off : (

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Hobo,NC

11-17-2023 13:12:20




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
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You are making this to hard. the collar drills easy enough and once drilled easy to split. I would also wager you don't need a puller for the bearing. I made a puller but the bearings were not hard to press off.
The trick, use a a large tapered punch to the drilled hole the tapper of the punch will crack it open nuttin to it.
On the big nut I will never reuse the old nut again a new one will spin right on just like its spouse to. If you are to cheap to buy a new nut then you will not understand.

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Mike(NEOhio)

11-17-2023 20:09:55




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 Re: 1975 3400 outer rear axle seal ?? in reply to Hobo,NC, 11-17-2023 13:12:20  
Hobo, the bearings on mine were real hard to get off. The puller I made had a 1 fine thread bolt to push on the shaft and three 1/2 threaded rods to reach the flange. Only way I could get them to move was tighten the nuts then use the BFH on the bolt. Tighten and whack over and over till it started to come easier. Had to drive the bearings back on with a long pipe over the shaft.



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Check Break

11-17-2023 07:31:01




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
If you know or can find someone who's good with a torch, meaning he/she can cut the collar and bearing without leaving a mark on your axle, you'll be miles ahead of trying to drill and split the collar and pull the bearing. Takes about a minute per side.



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Mike(NEOhio)

11-17-2023 05:09:19




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
That was me with those seals. Sean is correct. I&T manual says the round axle housing has the shrink collar and square housings use the nut. My 72 2000 has square housings but had the collars. You'd have to pull it apart to be sure but I'd bet on the nuts in your case. Manual says not to reuse the nuts but the dealer said you can if you're careful with them. I recall they were about $40 each. Collars have to be drilled and split with a chisel and it's still a bear to pull the bearings off. I made up a puller based on pictures of the NuDay tool pictures. Email is open if you're interested.

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ptfarmer

11-16-2023 23:00:17




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
Quoting Removed, click Modern View to see



That makes since now (was having one of those days).



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Sean in PA

11-16-2023 19:56:53




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
You originally said that the NH parts site was no help. If you know how to interpret the info there, it is very helpful. In the parts drawing for the axle, it shows the same parts for everything except for the parts out at the end of the axle, where it shows two different set of parts in the drawing. One section shows parts 12, 13, 14, 16, 17 & 18, and the other section shows 12A. 13A, 14A, 16A & 18A. So all of the parts in the drawing that have an "A" at the end go together and the ones without the "A" go together. Most of the parts all have the same description between the plain number and the number with the "A", so 12 & 12A are both describes as "Retainer". 13 & 13A are both described as "Bearing cup" , but with different dimensions. 14 is described as "oil seal" and 14A is described as "seal". 16 & 16A are both "bearing cone". 17 is described as a "spacer" and there is no corresponding 17A. It is 18 and 18A that differ in description, so that is the clue as to the difference for whether you need the "A" parts or the non-"A" parts. 18 is descried as "bearing lock nut" while 18A is describes as "ring". So if it has a ring instead of a nut, all parts with the "A" at the end are the ones that you would need. If it has the nut instead of the ring, all of the parts not ending in an "A" are what you need.

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ptfarmer

11-16-2023 18:37:57




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
Well that's a bummer, I greatly appreciate the info.



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Sean in PA

11-16-2023 18:04:40




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
I went through this with someone else in the last week or so. The different part numbers for the outer seal, bearing, bearing retainer, etc. are dependent on whether it has a screw-on bearing retaining nut or a press-on retaining collar. You need to open it up to see whether it has a nut or a collar to know which part number you need for the seal. It has nothing to do with it having or not having a differential lock.
This post was edited by Sean in PA on 11/16/2023 at 06:05 pm.

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Hobo,NC

11-16-2023 16:35:55




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 Re: 1975 3400 outer rear axle seal ?? in reply to ptfarmer, 11-16-2023 14:38:16  
I am gonna wager you are right.


free seals



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