Repairing and Rebuilding Hydraulic Center Swivel Center Post on Haas Tl-2 CNC Lathe 

Over the years i have been given many of these rotary cylinders to repair with Hard Crome plating. The internal bore is ground out to remove all the damage, it is then hard chrome plated undersize by around 10 to 15 thou. Then lastly reground to finish size, with, if possible, a very shallow taper to aid the seal compression on re-assembly. Always warm up the seals before fitting in hydraulic oil (never water!) and use vaseline to lube them as they slide in. After being hard chromed these rotary seals tend to last forever as they are more resilient to corrosion. I have also re-chromed 1000s of hydraulic rods in the last 50 plus years, and here is a top tip for any plant owner or operator. WHEN THE MACHINE IS NOT BEING USED, PUT THE SHINY STUFF BACK IN THE OIL!!! Why do I say this? Well consider and ponder on the following. A machine is frequently left for days, weeks, months or even years with the chrome rod sitting out in the atmosphere in ever type of weather possible. One day you start it up, the exposed rod is probably bone dry, covered in crap oa maybe event a bit rusty, and the only direction the rod can go is back into the cylinder, and those seals ain't gonna enjoy the ride! But if the machine had been parked up with the rod in the oil, even if it been sitting dormant for ever, you will be lubing up the seals from the get go. Look after the chrome and it will look after you

Sam you are a hell of a mechanic with a lot of other skill sets welding machine shop and electrical along with a good machine operator on old and new equipment...

haven't seen a more immersive lathe video on all of yt, this is so nice

Pro Tip - Soak all teflon seals and bands in hot water for 10minutes, then install...will make bands much easier to install and they'll shrink back much quicker than working them at ambient temp....also,use vaseline for lubing..also,the can is tapered only on one side,so make sure you install the center section from the correct side so it compresses the seals as it's being assembled

Thanks for showing the end results.

Fantastic very informative. I learned new very interesting techniques. Thanks keep up your great vids.

Nice work. Putting the bore in an oven up to temp that wouldn't damage the seals would have been an interesting idea. Not sure if it would work though.

That's a dam cool. Cnc lathe.

I think a ring compressor would have made too much sense to use.

Cool! A liquid slip ring.

You can do it all. 👍👍👍👍👍👍👍👍👍👍

Everything was so precise until you brought out the calibrated knockometer... Enjoyed the video, Thanks, I just ordered a seal kit for my lift. Very helpful. Hopefully mine will not be pitted.

jezus, that man with red sweater doesn't know how to put on a seal. now its broken.

I'd have warmed up the rotary cylinder in oil so the piston should fit more easily

Did you wind up using a press to get it back in?

my seals were leaking on my swivel joint and it cause all of hydraulic functions to lose power even the drives.replaced them and good as new .Did u have the same symptoms?

You have to compress the o ring with like a piston ring compressor

Pretty impressive until the hammering starts 👍🏼

Yo tengo una 337 bobcat escavadora. Pudiera tener arroglo

I would consult a hydraulic specialist that knows what needs to be done to repair this expensive part before I'd just jump into doing a repair that might work or just destroying the housing. I'm sure there's a hydraulic shop in the area that will give you the options you have.

Rotary Union

So how did you get it in for a finish?

That’s just a baby.... you should see the one that’s in the 40H on your video...

Where your safety glasses.

This was painful to watch.