TB 216 Pins

[jodb69]

Hi All

I'm just about to change pins and bushes on dipper end.

Any tips on how to proceed.. I.e get old bushes out, shimming etc.

Do the pins with grease nipples on have to line up with anything so the grease gets in?.

I understand the procedure and its my first attempt but tips will be welcome.

Cheers

 

[Quattromike]

What's your plan for getting old bushes out and new ones in ?
I've had the pleasure of having to do dipper bushes on a few different machines, proper tools always makes it easier, my go to is hollow cylinder and high tensile thread rod and suitably sized collars, pipes, washers. Can be done with hammer and drift but be aware of causing any damage if alignment off. Keep it clean and preparation is key as with most jobs

 

[jodb69]

What's your plan for getting old bushes out and new ones in ?
I've had the pleasure of having to do dipper bushes on a few different machines, proper tools always makes it easier, my go to is hollow cylinder and high tensile thread rod and suitably sized collars, pipes, washers. Can be done with hammer and drift but be aware of causing any damage if alignment off. Keep it clean and preparation is key as with most jobs

Someone said put a few spot welds on old bush then put old pin back in and wack it against the weld.

Also to put new bushes into freezer beforehand to shrink them a bit

 

[V8Druid]

Someone said put a few spot welds on old bush then put old pin back in and wack it against the weld.

Also to put new bushes into freezer beforehand to shrink them a bit

you run the risk of expanding the bushes in the bore with the weld technique if the pin is sloppy and doesn't have a perfectly square/sharp end to it - better off trying to drive it out from the end of it, with a drift just slightly under the OD of the bush .. always assuming they're not split/half bushes / are full width/one piece bushes. - other wise they will have to come out, from the centre, out, if they're split/half bushes

chilling the new one's will certainly help the cause a lot, for re-insertion

 

[jodb69]

you run the risk of expanding the bushes in the bore with the weld technique if the pin is sloppy and doesn't have a perfectly square/sharp end to it - better off trying to drive it out from the end of it, with a drift just slightly under the OD of the bush .. always assuming they're not split/half bushes / are full width/one piece bushes. - other wise they will have to come out, from the centre, out, if they're split/half bushes

chilling the new one's will certainly help the cause a lot, for re-insertion

Once the old are out do you just clean the bores out and insert new or do you add grease or something

 

[V8Druid]

Once the old are out do you just clean the bores out and insert new or do you add grease or something

the bushes should be an interference fit in the bosses and not be able to rotate - a little light lube to help insertion is all you'd need - the pins rotate in the bushes

 

[jodb69]

the bushes should be an interference fit in the bosses and not be able to rotate - a little light lube to help insertion is all you'd need - the pins rotate in the bushes

And just hit them in with a hammer? I read somewhere to use a certain type of hammer

 

[Mick-the-fitter]

Be careful, the bushes have an internal machined grove, one end runs outside the bush the other end doesn’t, the end that runs off will go towards the grease hole!

 

[bobthebuilder]

First thing is put the new bushes in the freezer for a couple of days.to get mine on the tb125 out ,I used some old bolts,dab of weld on bolt to bush and then chieseld out using the bolt as something to catch the chisel.and the new ones which had been in the freezer for a fortnight didn't take a lot of tapping in

 

[V8Druid]

And just hit them in with a hammer? I read somewhere to use a certain type of hammer

in an ideal world (with access to a lathe) a stepped drift would be the easiest and safest way to drive them back in
or as Mike said above pull them in with a hollow ram and suitable bushes/sleeves - (again suitably equipped) or after time in the freezer, they'd probably pull in easily enough with some threaded rod, if as Bob says, they don't virtually fall in

 

[V8Druid]

you run the risk of expanding the bushes in the bore with the weld technique if the pin is sloppy and doesn't have a perfectly square/sharp end to it - better off trying to drive it out from the end of it, with a drift just slightly under the OD of the bush .. always assuming they're not split/half bushes / are full width/one piece bushes. - other wise they will have to come out, from the centre, out, if they're split/half bushes

chilling the new one's will certainly help the cause a lot, for re-insertion

I have no experience of this particular machine so do not know if the bushes are one piece or split half type bushes ..
if they are split and insert from each side, against a stop shoulder, in the middle of the bore, then Bob's suggestion above is a good idea, to enable you to tap the bushes out from their opposite respective sides

First thing is put the new bushes in the freezer for a couple of days.to get mine on the tb125 out ,I used some old bolts,dab of weld on bolt to bush and then chieseld out using the bolt as something to catch the chisel.and the new ones which had been in the freezer for a fortnight didn't take a lot of tapping in

 

[Mick-the-fitter]

One bush each side

 

[jodb69]

One bush each side

So I just need to be aware of the grease channels on the bushes ?

Why are there only 4 dust seals?

 

[Mick-the-fitter]

If you look at the bushes you will see the groove internally one end runs off the end of the bush, that end will go towards the grease hole in the pin,

 

[Mick-the-fitter]

If you look at the bushes you will see the groove internally one end runs off the end of the bush, that end will go towards the grease hole in the pin,

 

[jodb69]

If you look at the bushes you will see the groove internally one end runs off the end of the bush, that end will go towards the grease hole in the pin,

Ok thanks