my gearbox rebuild

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Re: my gearbox rebuild

Postby mathias1 » Mon Feb 26, 2018 6:15 pm

Adrian,

just to be sure how far I need to tighten the nut. As it squeeze the gear, bearing and collar together. I turned it to the maximum, and returned it 2 slots. Now there's no axial movement possible.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Mon Feb 26, 2018 7:48 pm

Sorry, Mathias. Now understand which nut you are referring to. The ring nut that adjusts the end float on the shaft.
On mine I tightened it until I felt resistance, then slackened it a quarter/half turn until the resistance disappeared but without introducing any discernible end float. To test the end float, you'll have to do this adjustment when you have replaced the primary gearbox.
Best, Adrian.
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Re: my gearbox rebuild

Postby mathias1 » Sat Mar 03, 2018 6:49 pm

today I cleaned the 2 bearings of the pto gear box
the first one is number 6307 35x80x21
the second one is number 6209 45x85x19
both are ball bearings
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Re: my gearbox rebuild

Postby AdrianNPMajor » Sun Mar 04, 2018 3:29 pm

Cleanliness is key, as you obviously know. It's a bit of a chore degreasing and cleaning relatively large components, but when it comes to the repair and reassembly stages, you realise why all the cleaning was necessary.
I'm excited for you. You are about to reassemble, which is always the best bit!
Did you manage to source the double lip seal for the PTO housing? I have checked my notes and I can't find a record of the seal details. A quick measure-up of the shaft and housing will give you the dimensions you need.
You've got a few gaskets to make: PTO housing to gearbox interface; PTO selector fork assembly; PTO housing end cap; primary gearbox housing to gearbox interface. You'll also need the gasket that seals the union of the gearbox and rear axle housing, but this gasket is available to buy. I used Wellseal to mate all these seals. When reinserting the primary gearbox into the gearbox housing I made some dowels - buy four bolts, remove the heads and cut a slot for a screwdriver. The dowels allow the mating surfaces to come together in the correct alignment - with the Wellseal and gasket in place there is no room for correcting any misalignment without ending up with a sticky mess!
I recommend photographing everything for posterity. Thanks to your intervention, your tractor is going to live on. It will be useful in the future for people to know what you have done, seeing as you are correcting issues that all Majors are prone to and which, when dealt with, almost certainly won't need looking at again in the lifetime of the current owner.
More photos for us onlookers would be a good reason for taking them too!
Best, Adrian.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Sun Mar 04, 2018 3:46 pm

ps There is a small lip seal in the selector fork housing. Good idea to replace this now.
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Re: my gearbox rebuild

Postby mathias1 » Mon Mar 05, 2018 10:25 pm

Adrian,

I found all the seals I need. (ingoing shaft, outgoing, pto selector, brake shaft)
The double lip is available at some places. I ordered this at a QTP dealer. the reference for this seal is Sparex S65681.
It's always good to measure before buying the seals, as for the PTO-shaft there are different seals available.
As I cleaned the bearings of the PTO box, I found out one of the bearings didn't sound well. So a new one is on the way.
I will do all gaskets with an instant gasket kit, it's not like original, but easier and faster.
I may be able to find a gearbox transmission soon, so it would be a nice addition to the tractor.
If the weather get's better, I may do some painting on the rear end.

Anyway I want it back together soon, so I can start ploughing again.

O, and thanks for the tip to reassemble the primary gearbox without making a mess!

More pictures will come, as process is made.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Tue Mar 06, 2018 12:15 am

Well done indeed, Mathias. In an earlier post I remarked that you don't give up, and you didn't.
I forgot to mention the brake/clutch pedal shaft seals, but you are ahead of me there! Basically, when you've reduced everything to the smallest possible components, replace anything that's wearable, even if it's not worn (excepting bearings, unless they're busted/graunching).
You do realise that, with all this good work, you are setting yourself up for another job - an engine rebuild! Everything from the engine backwards is now bombproof.
Best, Adrian.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Tue Mar 06, 2018 1:14 am

When you mention 'gearbox transmission', do you mean the transmission brake assembly?
I believe tractors exported from the UK didn't always have a transmission brake. The photo you took of the primary gearbox is from the wrong angle to show where the transmission brake assembly would sit. Could you take another photo from a different angle to show us what you have?
Best, Adrian.
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Re: my gearbox rebuild

Postby mathias1 » Tue Mar 06, 2018 6:58 pm

Image

I'm in need of the 2 studs, the bolt, plates, spring and maybe also the gear.
And also the outgoing shaft with the handbrake lever.
Last edited by mathias1 on Sun Apr 22, 2018 12:25 pm, edited 1 time in total.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Tue Mar 06, 2018 8:05 pm

You've got the gear. I was interested to see if they bothered to bore and tap the holes for the two posts that hold the plates. They did.
Nice project to install the brake.
You'll have to drill out the blank in the gearbox housing. Are the two holes for the brake lever quadrant bored and tapped? Never seen one of these tractors and haven't got any books to hand.
Best, Adrian.
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Re: my gearbox rebuild

Postby mathias1 » Sun Mar 11, 2018 7:04 pm

AdrianNPMajor wrote:You've got the gear. I was interested to see if they bothered to bore and tap the holes for the two posts that hold the plates. They did.
Nice project to install the brake.
You'll have to drill out the blank in the gearbox housing. Are the two holes for the brake lever quadrant bored and tapped? Never seen one of these tractors and haven't got any books to hand.
Best, Adrian.


Making little progress right now.
The holes are drilled and I did find thread in it after cleaning the dirt out of it. For the shaft I do have to take out a plug.
I'm currently looking at a handbrake of a non super major. My parts book tells me only the handlever changed a little bit and also the posts that hold the plates. Would this be a problem?
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Re: my gearbox rebuild

Postby AdrianNPMajor » Sun Mar 11, 2018 7:35 pm

I don't know, so can't advise, but I doubt there was any significant change between the different models. Other members will know more.
Best, Adrian.
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Re: my gearbox rebuild

Postby mathias1 » Wed Mar 14, 2018 12:02 am

So far in preparation:

Before re-assembling the primary gearbox a check
should be made of the reverse idler gear shaft protrusion
above the raised section at the rear of the housing
(see Fig. 34).
(a) If a transmission handbrake is fitted, this dimension
must be 1.20 to 1.33 in. (30.5 to 31.2 mm.) to
give the required clearance between the brake
plates.
(6) If no transmission handbrake is fitted, this dimension
must be 1.30 to 1.31 in. (33.0 to 33.3 mm.) to ensure the correct idler gear end float of 0.010 to
0.025 in. (0.25 to 0.64 mm.).

This means I will have to knock down the shaft a few mm.
Image

This is all adjustment that needs to be made?
Any idea how to remove the 2 posts? are they fixed somewhere?

Progress so far:
cleaned up pto dropbox
Image
renewed the seal in the selector
Image
new bearings arrived for the pto dropbox
Image
welded the old bearing in the gearbox to come out
Image
Last edited by mathias1 on Sun Apr 22, 2018 12:26 pm, edited 1 time in total.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Wed Mar 14, 2018 7:53 pm

You are making good progress.
Re the posts, I didn't disassemble my handbrake assembly, but the posts must be threaded. I think this is shown in the parts diagram you have posted (sorry, I don't have my books by me).
You have reached a point where most of us haven't been, so it would be good to see photos of the details.
Best, Adrian.
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Re: my gearbox rebuild

Postby mathias1 » Wed Mar 21, 2018 12:18 am

I've got the handbrake transferred to the gearbox. All looks well. Will upload some pictures tomorrow.

I'm just a little confused about the PTO seal at the rear of the tractor. Which size do I need? I found a double seal with RIB3508 on it.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Thu Mar 22, 2018 1:36 am

It's a single lip seal. Apologies again, I didn't record details of the seal. I measure then source the seal, and not necessarily from a tractor website. It's definitely available.
Just posting this image for anyone finding this thread who might be looking for info.
How did you access the old seal, Mathias? My approach was to remove the outer circlip that retains the drive gear, tap the drive gear off its seat and key, so as then to have free access to the circlip that sits inside the casting. Removing this second circlip allows you to tap the casting off the bearing, thereby revealing the seal.
Looking forward to seeing photos of your work, especially those of the handbrake installation.
Best, Adrian.

[url][url=https://postimg.org/image/7288dvnh7/]Image[/url][/url]
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Re: my gearbox rebuild

Postby mathias1 » Thu Mar 22, 2018 10:27 pm

Image
the primary gearbox I found as spares:
Image
The studs can be hammered out using a bended bar. I used a piece of rebar.
Image
Installed on my own gearbox:

Image

PTO gearbox seal installed:

Image

Didn't remove the gear to get the pto end seal out, I got the circlips out with a screwdriver.
Last edited by mathias1 on Sun Apr 22, 2018 12:26 pm, edited 1 time in total.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Fri Mar 23, 2018 9:34 pm

Aha! So the posts weren't threaded. Wouldn't have guessed that ..... and I didn't guess that!
Well done. Great work. Methodical.
Best, Adrian.
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Re: my gearbox rebuild

Postby mathias1 » Mon Mar 26, 2018 6:21 pm

Last weekend I reinstalled the primary gearbox.
This is how it looks like
picture of the handbrake discs in the gearbox:
Image
I haven't fixed the ingoing shaft yet. I will need it soon to install the clutch. Still need to find a way to clean the clutch completely on the inside, as it's a little bit greasy.
Image

I also took off all the paint and dirt of the gearbox to get it ready for painting:

Image
Last edited by mathias1 on Sun Apr 22, 2018 12:27 pm, edited 1 time in total.
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Re: my gearbox rebuild

Postby AdrianNPMajor » Tue Mar 27, 2018 10:28 pm

Textbook work, Mathias!
Best, Adrian.
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Re: my gearbox rebuild

Postby mathias1 » Sun Apr 15, 2018 8:20 pm

After some ploughing work today, all seals did hold the fresh oil. No leak at the pulley, also no free wheeling (put 2 thick gaskets in there). The gearbox oil did stay on level, but did get very hot in about an hour driving. You barely couldn't touch the gearbox housing.

I also got suddenly a leak at the fuel tank, I will try to fix it with the loctite 2K stuff.
Image

Image
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Re: my gearbox rebuild

Postby AdrianNPMajor » Mon Apr 16, 2018 6:31 pm

The energy of the spinning gears coming up against the viscosity of the gearbox oil = heat. You'd have to worry if the gearbox wall wasn't hot after an hour of hard work!
Well done indeed Mathias for a thorough job. You tackled some difficult issues.
Best, Adrian.
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