Author Topic: Gearbox bearings  (Read 612 times)

Offline BSA500

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Gearbox bearings
« on: 12.03. 2013 19:59 »
I am putting a couple of new roller bearings in the box this Friday. I have got the sealed bearings and was wondering in passing could you run the large bearing with the shields left in?. Just curious. Also I have owned for 23 years and this is the first time I have replaced the kickstart end roller bearing *eek*
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Offline trevinoz

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Re: Gearbox bearings
« Reply #1 on: 12.03. 2013 20:50 »
They would be ball bearings.
I take out the seal/shield towards the inside to allow lubrication.

Trev.
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Online KiwiGF

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Re: Gearbox bearings
« Reply #2 on: 12.03. 2013 21:53 »
As per prior post the rubber dust shield can be left on the new primary side ball bearing in an attempt to keep oil INSIDE the box (and grit out), but I'd still retain the original BSA oil seal as well, the seal towards the inner side of the box  MUST be removed to allow gearbox oil to lube the bearing.

The kickstart end I've no experience of using sealed bearings there, but I can't see any advantage from having dust seals in place so I would remove both of them.

Now, as you no doubt have some symptoms of wear? There are 5 "important" bearings in the box (2 on main shaft, 2 on layshaft, plus sleeve gear bearing) do you think you might need to replace all of them?

There is some info. available on the forum on replacement of the layshaft bearings and sleeve bearings, also on aligning the drive side oil seal. Just ask away of you need help.

I have suffered from getting the sleeve gear bearings wrong, but at the 2nd attempt I seem to have got it right without the need to involve a machinest or buying expensive reamers etc.
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Offline BSA500

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Re: Gearbox bearings
« Reply #3 on: 12.03. 2013 22:20 »
Don't get wrong I have replaced these bearings many times(except the small ball bearing naughty me *smiley4*) with and without shields I was just curious. I am just doing the ball bearings as they are quick and I use her everyday so don't have the time to do the bushes (i have done the sleeve gear ones in under aa day and that seems fine)
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