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mmi
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ST225 is a main shaft bearing for a 284

ST678 is for the steering worm shaft on 340 404 424 444 504 and a few other utility types. The last two sub to the ST678

 

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1 minute ago, pirlbeck said:

The ST678 is probably a full complement bearing, which is a LOT heavier bearing then a standard bearing, not saying it is a $150.00+ better though.

There are very few left that can answer that, For the IH applications it seems to be just light steering boxs,

many others, it is trans or drive line power,so why would those not required the HD

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I know a number of years ago I was going to pickup the front worm shaft bearing for an m or 400 and they tried to sell me the high priced full complement bearing, so I had a chance to compare them side by side. The full complement bearing looked and felt a lot heavier and I have seen the lighter version fail pretty bad back when these tractors were being used pretty hard.

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Those steering bearings are made for thrust. They are not a regular ball bearing. A regular ball bearing would not last very long on the steering worm gear on an M or H if its used regularly. I would give the guy a choice between a 35.00(at that time) thrust or a 6.00 ball bearing. Most the M's at that time had loaders on them and the guy found out real fast the 6.00 bearing did not last very long.

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10 hours ago, cedar farm said:

Those steering bearings are made for thrust. They are not a regular ball bearing. A regular ball bearing would not last very long on the steering worm gear on an M or H if its used regularly. I would give the guy a choice between a 35.00(at that time) thrust or a 6.00 ball bearing. Most the M's at that time had loaders on them and the guy found out real fast the 6.00 bearing did not last very long.

Theres the rub if a st225 was speced and lasted 50 years and was used by 50 different mfg and is still subbed from those mfg to the current st225 version why is fiat $110 more +-

Adults at MI generally calculate OEm in

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Just for info.  John Deere's bearing set for the steering thrust on A B and G is 79.23. Low production specialty bearings are not cheap.

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7 hours ago, mmi said:

Theres the rub if a st225 was speced and lasted 50 years and was used by 50 different mfg and is still subbed from those mfg to the current st225 version why is fiat $110 more +-

Adults at MI generally calculate OEm in

Fait is marking up parts in the insanity range and if you don't like it too bad IMHO.  PTO housing o-ring for Super M t/a is $33 USD .  That is 10 times more than a comparable o-ring from a bearing retailer. I doubt they sell a lot of some of these parts so they inflate the price to cover carrying them There is and was never a little bearing like that st678 made that is worth $166. The days of IH making their own bearings was a long time ago and the retailers can source bearing exactly the same for a fraction of the stupid price.  apples to apples- spec to spec Fiat is out to lunch

 

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20 hours ago, mmi said:

Thanks was offered some in the paper cans.

did find, fits 200+ other application and 2x $ motion ind only wanted $25, so why is fiat $160 ?

Same manufacturer or no?

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On 3/14/2022 at 11:35 PM, mmi said:

Thanks was offered some in the paper cans.

did find, fits 200+ other application and 2x $ motion ind only wanted $25, so why is fiat $160 ?

Bearings are strange, years ago I needed a bearing for the input side of a steering bolster on an JD440 TLB had the parts book, looked it up by jd number and it crossed to a SKF that was over 200 bucks. Seemed steep, so i called applied bearings, they crossed it a couple different ways and came up with the same thing give or take a few bucks. 
long story short that was some sort of super duper high speed bearing, which was unnecessary for the application. I used a Mic to get accurate dimensions and they found me a suitable one for around 20-30 bucks. Sometimes you have to hunt around. 

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