Farmall 300 Transmission Clunking

J. J. R. · Jun 17, 2016

We recently picked up a Farmall 300 that runs nice and is fairly nice condition. However there is a somewhat loud clunking in the forward area of the transmission anytime the clutch is let out. Even in neutral. We creeped it around so not to create more damage. I'd like a few suggestions as where to start looking for the problem. It is a steady clunk, so I doubt it is a bearing. More than likely a broken tooth in a gear. I dropped the rectangle cover under the tractor and drained the rather milky looking oil. That gear looks to be in very good condition. Next I figure I'll drop the TEE looking cover to look in there. I know we will have to split the tractor and probably pull the TA section out. But I just thought I get a few professional suggestions before we get started. Thanks.

Joseph2001 · Jun 17, 2016

Someone most likely tried to shift without clutching it and doing so takes out notches so you will have to open the trans and find what gear is broke but IG you need to run it just run it it won't to much more damadge

J. D. Unstyled · Jun 18, 2016

I am wondering if I have the same problem as you? In my IHC 300 Utility, the t/a works fine, etc. All the gears are as they should be. It makes a sort of repetitive 'clunking' noise deep in the trans when taking off. Sort of like it winds up and releases. I thought the clutch would set in and these jerky take-off symptoms would go away. It seems to do no harm. After 30 hours of use there is no change. I am picking up an old transmission for spare parts soon anyway, but the problem may be in the clutch... The problem was in the tractor before I changed the clutch. Once on the road, the thing runs and drives beautifully.

TomH in PA · Jun 18, 2016

It might be the pilot bearing going bad. Either way, I'd pull the cover and check before using the tractor hard.

D Slater · Jun 18, 2016

Under the rectangular plate is the PTO drive gear and it turns all the time engine does with independent PTO. T shaped plate is also PTO drive parts and that's about all you can inspect trough the hole. Noise won't stop when clutch is depressed. If the noise changes speed when t/a handle is pulled back would check constant mesh gears or the reverse idler in the transmission. That's the only two gears in mesh with transmission in neutral. If noise stops with t/a lever back maybe t/a pressure plat damage or the retaining nut came loose for the t/a clutch carrier. May not stop noise anyway with some problems. You can look in the top of center housing at t/a clutch and part of t/a. If it has a belt pulley gear box cover plate you can remove it and probably see if it's in the transmission side. Also can remove gear box if equipped but not simple on the 300. With t/a lever ahead and transmission in neutral gear noise I would lean to transmission side or output gear of t/a. Or transmission main shaft pilot bearing.

J. J. R. · Jun 20, 2016

Found a part of what looks like a gear tooth laying in the T-shaped cover when I removed it. Clunk still always there anytime the clutch is out. I'll have to try with the TA pulled. Don't think I tried that yet. Getting ready to split the tractor to investigate deeper. Thanks for all the advise.

Farmall 300 Transmission Clunking

J. J. R.

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Joseph2001

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J. D. Unstyled

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TomH in PA

Well-known Member

D Slater

Well-known Member

J. J. R.

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