48 Knock in 2nd

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Dadsfarmalls
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48 Knock in 2nd

Postby Dadsfarmalls » Tue May 12, 2020 3:55 pm

So other than pulling the 48 out of the garage I haven't started messing with it yet. But I'm getting closer, going to change out all the fluids and start the normal maintenance. I decided to just do a quick check and drove it up the little lane by my house. For the most part 1st & 3rd seemed normal to me, but when I put it in 2nd I was hearing a knock, knock, knock that I didn't like the sound of. Seemed to either be coming from the trans or the left final drive. Any suggestions on what I might be looking at?

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Re: 48 Knock in 2nd

Postby MiCarl » Tue May 12, 2020 4:19 pm

My '48 does that too.

I pulled the transmission cover expecting to find a broken tooth on the 2nd gear set. No broken tooth but the drive gear (the small one) shows lots of wear. I'm holding off working it in 2nd until I get a chance to replace the drive gear. I don't want to damage the driven gear (the larger one) because it's no longer available.
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Re: 48 Knock in 2nd

Postby tst » Tue May 12, 2020 5:16 pm

make sure the lug bolts and center to rim bolts are tight

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Dadsfarmalls
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Re: 48 Knock in 2nd

Postby Dadsfarmalls » Tue May 12, 2020 5:54 pm

All bolts checked and are tight

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Re: 48 Knock in 2nd

Postby coppersmythe » Tue May 12, 2020 5:57 pm

:Dito: Good things to check . My '48 was making that type of noise , but in 1st/reverse . it ended up being a tooth broken off . it would not hurt to take the cover off and check . Narrow the search . coppersmythe..............

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Re: 48 Knock in 2nd

Postby tst » Tue May 12, 2020 7:26 pm

look harder at the gear teeth, make sure the shifter fork is not cracked/ broken

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Dadsfarmalls
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Re: 48 Knock in 2nd

Postby Dadsfarmalls » Tue May 12, 2020 8:29 pm

Thanks, it'll be a couple days before i can get back to it, but thats what ill check next.

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Dadsfarmalls
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Re: 48 Knock in 2nd

Postby Dadsfarmalls » Tue May 19, 2020 7:06 pm

I found some dinged teeth but didn't see any completely broken off. I'll try to take a better look tomorrow when the sun should be out.
Attachments
trans.jpg

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Re: 48 Knock in 2nd

Postby Bob McCarty » Tue May 19, 2020 8:06 pm

It looks like the lubricating hole at the top of the picture may be clogged since the depression is full of oil.
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Re: 48 Knock in 2nd

Postby Glen » Tue May 19, 2020 9:14 pm

Hi,
I would clean the oil trough in the upper part of the transmission case, oil is thrown into it when the Cub is moving.
There is an oil hole at the front and rear of the trough. The oil lubes the bearings on the clutch shaft, or upper trans shaft.
I use a drill bit the size of the holes, no electric drill, just the bit, and turn it into the holes by hand, use pliers on the bit if needed.
The bit will collect the dirt, and you can pull it out of the holes.
The bit may not go fully into the holes in 1 try, you may have to pull the bit out, and clean the bit, and then turn it in farther.
When you have cleaned as far as it goes in, use compressed air on the holes, and see if they are open into the bearings. Use your safety goggles when using the air. :)

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Re: 48 Knock in 2nd

Postby Nelson 634 » Wed May 20, 2020 12:02 am

Is that a repair on the first and reverse shifting fork? The one on the right side looking towards the front of the tractor. If so I don't know if that could cause the noise your hearing. Someone more knowledgeable than myself will have to tell you that. If it is a repair I would be interested in seeing a picture from a different angle. I have two tractors with broken forks. Looking for fix. Replacements have not worked.
Walter

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Re: 48 Knock in 2nd

Postby Urbish » Wed May 20, 2020 5:46 am

Nelson 634 wrote:Is that a repair on the first and reverse shifting fork? The one on the right side looking towards the front of the tractor. If so I don't know if that could cause the noise your hearing. Someone more knowledgeable than myself will have to tell you that. If it is a repair I would be interested in seeing a picture from a different angle. I have two tractors with broken forks. Looking for fix. Replacements have not worked.


That shift fork appears to be completely machined from a block of steel vs. the OEM stamped one.
Jim

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Dadsfarmalls
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Re: 48 Knock in 2nd

Postby Dadsfarmalls » Wed May 20, 2020 8:02 pm

Nelson 634 - here's another angle of it.
Attachments
fork.jpg

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Glen
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Re: 48 Knock in 2nd

Postby Glen » Wed May 20, 2020 8:55 pm

Hi,
Below are pics from TM Tractor of a first and reverse shift fork, if you want to see pics of the original style. :)

http://www.tmtractor.com/tm-tractor/gtr/frsf_001.htm

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Re: 48 Knock in 2nd

Postby Nelson 634 » Wed May 20, 2020 10:42 pm

Dadsfarmalls wrote:Nelson 634 - here's another angle of it.


Thank you very much, that helps a lot. I bought several reproduction ones, none of them would fit rail. So I returned them. This will give me another option. I can use broken one and fabricate a repair. Thank you very much. Walter


Glenn, your help is also greatly appreciated. Walter
Walter


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