Gearbox Needle Roller Bearings

[AlanG]

I'm struggling to remove the three shell type needle roller bearings from the input and counter shaft. What's the best way of doing it?

Alan.

[Rob Salisbury]

Carefully applied brute force and a sacrificial very sharp wood chisel worked for me Alan, not pretty, but it get's the job done!!

Cheers Rob

[Chilliman]

Internal bearing puller:

 

 

 

[AlanT]

If you are lucky there will be a gap about 1/16in wide behind the bearing cage at the bottom of the hole.

 

Somebody like me with a lathe can make a "top-hat" section with a threaded hole in it. Then slice this in half and jiggle in behind the bearing. When you put a bolt back in the thread the two halves will "jump-out" and grab the bearing.

 

Now you have a home-made puller. They are not very tight, just awkward.

 

If there is no gap, because someone pushed it in too far, then you jack the top-hat in between the rollers and cage and pray.

 

This will not be the last little tool you will need to make to get a gbox to bits and back together without a lot of brute force and damage. Likewise the OD.

[AlanG]

Thanks for the replies folks. I eventually used a dremel and very carefully ground the outer shell until it was paper thin and then split it with a chisel. The grinding has to be done very carefully so as not to damage the shafts. I would not recommend this method and next time would make, borrow or steal a puller.

Alan.