NH 477 Haybine input shaft bearing replacement

Axtell · Feb 16, 2021

This project started out just to replace oil seal (19). In the process of pulling out input shaft (15) the outer bearing (6) came apart. The shaft was pretty snug on the way out and apparently the pulling knocked the roller bearing cage loose. I did back off on both bolts (20) as the service manual says. Maybe 1/4-1/2. Anyway I ended up having to cut the outer bearing inner race off the shaft. I could not get it to budge with heat. Now I am putting the replacement bearing back on but it sure is tight from the start. I was going to start tapping the other end of the shaft on a table to get the bearing to slide down but though Id ask here to see the experience of others. Thanks.

Matt in Oz · Feb 17, 2021

Random thought could the shaft go in the freezer and the bearings somewhere warm in the house. Assume the shaft is clean and free of rust. If covered in gunk then some wet and dry abrasive paper and a cleanup may be needed first.

Axtell · Feb 17, 2021

(quoted from post at 04:46:31 02/17/21) Random thought could the shaft go in the freezer and the bearings somewhere warm in the house. Assume the shaft is clean and free of rust. If covered in gunk then some wet and dry abrasive paper and a cleanup may be needed first.

I have both in the house now. I will try they that and post the results. Thanks Matt!

Dieseltech · Feb 17, 2021

I use a toaster oven to heat bearings before installing them when tight, 300F degrees makes a world of difference. Freezing the shaft helps too.

Axtell · Feb 17, 2021

(quoted from post at 08:49:24 02/17/21) I use a toaster oven to heat bearings before installing them when tight, 300F degrees makes a world of difference. Freezing the shaft helps too.

Thanks. Have one of those too. Will definitely try that.

I had no issues with pulling the shaft from the inner bearing and would have expected the outer bearing to at least come out intact on the shaft. I am expecting the outer bearing cage must have hung on the oil seal causing the bearing to come apart. I was able to easily get the oil seal out with a claw hammer. Re-reading the service manual it does not mention removing the oil seal to remove the shaft, but has it as the last thing to install with reassembly. Should have let that sink in. With the shaft installed I will have to use some sort of a pipe to install the seal.

Axtell · Feb 19, 2021

Thanks everyone. I was able to start the the bearing on the end of the shaft by freezing the axle and heating the bearing, but ended up having to to use a 1 1/4 x 6 galv nipple to press the bearing the remainder of the way.

Matt in Oz · Feb 19, 2021

Thanks for the feedback Axtell glad it worked.

NH 477 Haybine input shaft bearing replacement

Axtell

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