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48 M will not stay in 5 th gear

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smcIND

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I know this has been addressed on here but I can"t remember the fix for this. I have a 48 Farmall M. I drove it from my Dads to my place today , it was the first time I drove it down the road for more then a mile, and it keeps coming out of 5th gear. What would be the fix for this problem. Thanks Steve
 
5th is direct drive, the shafts are splined, one slides inside the other -- most likely the splines are worn, thus it won't stay engaged. Thus the shafts have to be replaced. I think you can see by removing the belt pulley, but to get the shaft and gears out you have to remove the trans cover, don't know if the belly pump has to come out or not, but the tractor does not have to be split. It also could be as simple as reshaping the bottom of the shift lever.
 
In addition to what CNKS said there is also a possibility that the shift fork is bent or the rail is worn and the detent ball is not able to hold it in place.
Zach
 
Remove the belt pulley or cover plate (whichever you have) and you can readily see the area of interest. In addition to what CNKS said, there is the possibility of excessive wear in either the pilot bearing or the bearings in the input shaft assembly or some of both. Under load, the two shafts will be misaligned enough to allow the gears to "walk out".

With the trans open, engage 4th gear and grab the front of the mainshaft and try to wiggle it around. Excessive play will be obvious. You'll be able to clearly see the splines on the inside of the 4th sliding gear and at the back of the input shaft. Try wiggling the input shaft as well.
 
Trying to remember if the pulley has a drain plug. The oil in the transmission is way below that point. Most of the oil drains back into the transmission, but it is still a mess to handle.
 
No, any mess will be minimal. The normal oil level in the trans is about half way up the countershaft and that's well below the part you need to look at. Just have a big piece of clean cardboard ready to set it on. Clean around it real good so dirt doesn't fall in when you remove it and be ready for the weight! It's located by two dowels and may take some prying and little wiggling to get it loose.
 
My H had a broken spring and a worn out gear.

I don't think anybody mentioned a worn out bearing on the top shaft. That will also make them jump out from what I have read.sd
 
Thanks to all of you I know where to start. It will alittle time before I can tear into it. I will let you know what I find out
 
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