Getting bearings off a yoke spindle HELP! update!

[pepperami]

OK ! so the great Sachs XTC saga continues

Well today I took the front wheel out and dropped the forks, no major issues there thankfully

After a bit of swearing and cursing the yokes finally let go , the top bearing looks and feels to be in good order.
However the bottom bearings are absolutely f*cked.
I`ve got a new set to go in, but the bearing shell in the head-stock and the bearing on the bottom yoke just refuse to let go (bi-metalic corrosion I suspect).

So mighty BCF!, I seek your advice , how do I get them out without destroying the yoke and head-stock?
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I am the sum total of my own existence, what went before makes me who I am now!

[Raffles]

Have you tried warming them up?
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A good loser will always be a loser.

[temeluchus]

A internally expanding bearing puller would be a good bet for the race in the headstock.

The usual method is drifting it out from above using a long drift or flat blade screwdriver and a hammer.

You may be able to carefully but a slot in the bearing cage on the yolk, then crack the cage and the rollers off with a chisel. You are left with the inner race, which you can carefully pry up with the chisel working a little at a time from different directions.

If your worried any good machine shop should be able to swap the bottom bearing for a few quid.
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Some shite cruiser. Now with guns and FREEDOM!

[robocog]

heat, penetrating fluid, patience and suitable force

Just been through similar recently so I feel your pain

I used a combination of the above which eventually worked
(though mine may have been a tad easier as it was steel and bronze firmly wedged in alloy so heating the alloy and cooling the stuck bits with the penetrating fluid and rapidly getting physical with it got them shifted...eventually)

For the part thats stuck in the headstock just make sure you drift it out straight (so work a little at a time and keep moving round it and use plenty of penetrant)

May help to heat the headstock up a tad (may help assist breaking the bond as well as hopefully expanding the tube)

For the yoke -again heating the siezed bearing should help it off (even better if you can run a hosepipe or something down the steering tube so it stays cool)

either way deffo worth soaking both the stuck bits in penetrant and going off to do something less frustrating whist it does its stuff

Good luck

Regards
Rob
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Needs a bigger garage...

[andys675]

I had the same problem with a TZR125R front end I was fitting on my 350 YPVS, I hacksawed a slot in the bearing and then used a small chisel on the slot until it cracked, once it cracked it went loose on the stem, but also seen the slot cut with a dremel on another bike

[stinkwheel]

It's a complete bastard of a job. Just keep at it. A good sharp drift for the one in the headstock is invaluable, if the edges are rounded, face it off again with a file.

The bottom one will let go eventually. I usuaslly prise it off with a pry bar and/or a cold chisel and hammer, just keep working round and round. Do not expect to retrievve the dust seal intact.

If you have access to a welder, run a ring of weld round the race in the headstock and it'll either drop out or shatter when you hit it with a hammer.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[pepperami]

Much thankness for your replies folks
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I am the sum total of my own existence, what went before makes me who I am now!

[pepperami]

Well that`s the bearing off the yoke done with a mixture of heating and cooling + some bashing , no damage done to the yoke or the yoke stem .

Now for the shells in the headstock .
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I am the sum total of my own existence, what went before makes me who I am now!

[pepperami]

Well I got the bearing off the yoke and the bearing guides/shells out of the head-stock...........so far so good,

Now I find a problem , the top guide/shell went in as it should ie a tight/firm fit.
However the bottom guide/shell just pushed in and appears to be a tiny bit loose? .

So either I have wear in the head-stock or the bottom bearing is a different size?
I have looked in the manual and I can see nothing about diffreing sizes of bearing on the yoke or in the head-stock?.

so mighty BCF , what did you do when the head race bearing were a bit loose?, did you pack them? what with?
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I am the sum total of my own existence, what went before makes me who I am now!

[stinkwheel]

Sure you have them the right way round? (ie. bottom in bottom and top in top?)

If it's just a bit loose (as in not rattling), you can use bearing fit compound which essentially glues it in place.

That said, as long as it can't move and rotate in the seat, it ought to be ok. It can't drop out when it's all assembled
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[kestrel]

Loctite do several variations of bearing fit or bearing mount. You really do need to check before resorting to 'glueing' the bearing in that it is indeed the correct bearing that you are trying to fit. Headstock bearings see tremendous side loads during braking so take your time and make sure you've got it right.
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Isle of Man.........Road Racing Capital Of The World

[Ariel Badger]

[stinkwheel]

[Pete.]

Loctite bearing fit or a similar product would be fine. They specify a minimum 2 thou gap anyway.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[pepperami]

Well I have been doing some research and I definately have the right bearings and I am putting them in the right way!

Talking to the owner reveals that the front end has been messed around with at some time in the past and crashed .

I`m guessing that the front end was`nt tightened up properly last time and this has caused wear and tear on the bottom hole of the head-stock.

I take on board what you chaps say about bearing-bond, this may be the solution........... I hope (fingers crossed)
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I am the sum total of my own existence, what went before makes me who I am now!