Yes, frustration to a noob looking to remove a drive coupling which has been press fit onto a shaft. Can anyone help? I have looked up some stuff. Some say force, heat and cooling. But I don't know which is safer as I don't want to break the coupling with too much force!

Thanks in advance

Ok see the pics below. I basically want to keep the drive coupling and dont need the shaft. Any ideas?



Charlie

[Edited on 5-7-12 by Chaz]

[Edited on 5-7-12 by Chaz]

[Edited on 5-7-12 by Chaz]

any chance of a picture? Hard to say from that sparse description

Yes need pictures, you could Grind through sleeve till it splits or heat up cherry red and knock off, Press off. As we said need pictures to decide.

Ok I'll get some pictures, thanks back soon

Again, pictures but:

Similar metals and non temp sensitive parts - you need to heat the lot up as hot as you can physically manage, then cool the shaft while holding it in a vice and try lumping the hot sleeve off.
Dissimilar metals - might just fall off with heat due to different expansion rates.

Caution - quenching steels after heating them a lot can make them brittle and do other damage to heat treating if present. Heating aluminium can trash it by removing factory heat treatment. Heat method is only for last resorts or really over-engineered steel bits.

Otherwise you're going to need to press/pull it off. It may never have been intended to come off again - some cryo-fitted parts literally contact weld themselves together they can be that tight.

When I have had to replace worn out wheel bearings on my old Audi which were a press fit into the hub, I took the hubs into a local garage who pressed the old one out and the new one in using a hydraulic press. I think they charged me three quid for the first pair, then a tenner for another two a few years later.

I have found that most parts which are press fit are not expected to come apart and stay intact. For example press fit bearings generally get destroyed when they're removed.

It might be that you have no choice but to sacrifice the coupling.

That'll press off and right back on again. You might struggle with the old vice techinque but a local garage will have a 10T press that will do the trick.

You are more than welcome to use my press if you happen to be in the Melksham area... Offer is open to any forum member.

Can I do this with a vice at home rather than take it to a garage? If so shall I cool it or heat it, how shall I do it?

Thanks again for all your advice here, very much appreciated!

will a 2 leg puller not work on that? in vice with the occasion tap from a hammer to shock it out?

My two leg puller is quite big for it. Do you suggest I heat or cool it as well?

Down side of using a hammer to shock it is could end up breaking it where using a pess will force it off. Just depends upon the material.

here is another option, rather than faff with that lot, sketch what you need, and somone on here might be able to make you a new coupling, so removing all issues and doubts about damage during removal.

Just a wild thought

Wow, just used a twin arm pulley puller and it came off! Thanks guys