M noisy tranny or rear end

WFE270NWIA · May 25, 2023

My M has a loud growl in 5th gear under a load but is quiet under no load. Where is a good place to start looking for the problem? Thanks.

Mrfred54 · May 25, 2023

Remove the drain plugs and hopefully no bearings or gear teeth fall out

Janicholson · May 25, 2023

5th is actually a coupler splines that connect the trans input shaft to the output shaft. the noise might be present in all gears, but, due to much higher RPM of the ring and pinion, the differential, and the final bull gears, it is louder and more obvious.
Things that it could be: normal (have someone that has history with an M listen to it). It could be the rear top shaft bearing.
It could be pinion and ring gear wear. Carrier bearings for the differential/final drive bull pinion. It could be a Bull gear primary bearing on the inner end of the axle. Jim

WFE270NWIA · May 25, 2023

Was hauling grain to the elevator with it today. First load went fine second load it growled pretty loud going up a hill so I think something may have happened to it.

Janicholson · May 25, 2023

Bull gear support bearings have had failure issues. if there are bearing cage pieces in the rear housing, i would not operate it until repaired, the balls fall out of the bearings and get caught between the teeth and the housing casting making a hole in it. Jim

used red MN · May 25, 2023

You have to be careful running those old Farmalls with badly worn bearings. What happens is the cages in the bearings that hold the balls evenly spaced get worn so badly that they start to come apart. When they come apart bad enough then the balls all fall to one side. Then the ball loading notches come around and the balls are not under much tension and fall out. The problem is that the bull gears run to close to the bottom of the rear end castings and there is not enough room for the loose balls. When they run under the bull gear the case busts out and you are made aware of the problem like it or not. The worst offenders for this are the inner axle bearings next to the bull gear. The You could pull out the brake pinions part 11 in subsection 229 of Chassis section in the link. Should pull out after the brakes are pulled off. Probably just have to make up your mind that the top will have to be pulled off. If it is an actual working tractor you want to do it right the first time.
CNHI Farmall M

Oops, did not mean to double up on what Jim said.

This post was edited by used red MN on 05/25/2023 at 08:46 pm.

Pete76NYPa · May 25, 2023

first thing to do is drain it...see how much chocolate milk is in there from years of condensation. if there is alot, fill it partially full of kero or mineral spirits and tow it around with another tractor for a bit letting it slosh around good. then refill with some new oil and add a gallon of Lucas. Dis this to a Super H and a Super M that sounded like yours, and BIG difference.

caterpillar guy · May 26, 2023

You need to pull the lid so you can wash the oil rund out that will be full of sediment and thick goo like crude. If not washed out the oil can just run off the sides of them and not have to go to the bearings and gears as it is supposed to. They are on both side of the case. Best to probably just plan on replacing all the bearings and seals at this time. Will fix any leaks and show what is worn in there. We did that to Dad's 1466 a bout 10 years ago now. We also deleted the junk TA then too. Don't miss it.

Olyj1947 · May 26, 2023

If you drain the differential, stick a magnet in the lubricant to see if filings are present, hopefully not.

fastfarmall · May 26, 2023

I would look for trouble, before putting in that Lucas !!!!

gene bender · May 28, 2023

WHERE does the condensation come from there are no vents in the system so just how does all the air get thru the tranny to let condensation happen not even enough volume in the tranny to get enough air thru for condensation. You must be talking about tractors that set outside yr around and over a long period rain can leak down the gear shift as that is the only opening in the tranny exposed to the weather

D Slater · May 28, 2023

Must be lucky enough to not have weather conditions where you live that sometimes even in a unheated closed shed it will cause the metal housings to get soaking wet. Happens on inside also.

M noisy tranny or rear end

WFE270NWIA

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Mrfred54

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Janicholson

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WFE270NWIA

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Janicholson

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used red MN

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Pete76NYPa

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caterpillar guy

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Olyj1947

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fastfarmall

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gene bender

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D Slater

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