Repairing a golden Oldie powertool. How to dismantle and repair a Makita HR5000K rotary hammer. 

😂😂🎉

😂😂🎉

Super reliable old donkeys these machines but you need to keep them serviced.

Thanks again!

See that. The bearing race and punch are both very hard. Not unusual to get a few sparks.

Thanks

for everyone that's looking for it @8:40 and further :D and it's OEM, but not need in this context. I think you meant OEM approved :D

I'm thinking the same or if the old groves are deeper, that is asking for trouble :( if they're the same then no problem just on the lathe and make the grooves wider.

@@Damicske I've gone down that road before. Not on a HR5000 but an old Kango machine, i spent ages trying to source seals that would work when they discontinued the proper ones, nothing worked reliably so i set about making some fit. My god those strikers are hard! it turned into an unexpected lesson in lathe insert technology and a almost encyclopaedic knowledge of the sandvik-coromant catalog. We ended up using a toolpost grinder as we couldn't get the result we were after with regular tooling.

@@mattjenkin1258 doh forgot about that. yeah those can be real hardened through and through

Yeah I think that would be an easy task except he's not a machinist and doesn't have a lathe, as far as I know. I agree tho I'd stick it in the chuck & open groove up to accept that bigger o-ring instead of searching for new part. Assuming the dementions are the same otherwise.

@@tdotw77 I assume those parts are hardened?

That thing is harder than a door nail, it has to survive millions of hard impacts against the tool.

@@tamask001 Yep! we tried this years ago, ended up grinding them as we couldn't get the finish right with insert tooling.

Wait until you need to smack the end of it with a sledge, the ol' rotary impact torque amplifier.

he has tons of it flying around in his shop. When he is hammering at the end with the drill on the stone (?) you can see it sometimes. Maybe he has robbed some Scots and uses their kilts? ;)

@@tommeier2299 😂😂

So would I, but it's not my tool. And I don't think the customer would want to pay me for the extra work

I seem to remember from somewhere - dean or otherwise, can't remember - that when those metal rings break all hell can occur due to bits of small metal jamming everything up and getting to places they shouldn't, like gear teeth. While they last a long time, it's the catastrophic failure that *could* happen to other parts. That said, not much different than piston rings in an engine...

That is exactly right.

I recon its due to manufacturing costs and if these metal piston rings ever break with small fragments getting flung around in the hammerpipe it would ruin the hammerpipe, striker and piston.

I'd guess since the grease needs changing anyway, it's not a big deal to swap the o-rings when you do a service.