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  #11  
Old 02-03-2019, 04:16 PM
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greywynd greywynd is offline
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Default Counter-Balanced Shop Crane

We had one at the last 9-5 I was at. Be careful as you roll it around, especially with a load, as the extra weight has a lot of momentum.

We used it in places where we couldn’t get crane or forklift access, usually it was replacing pumps of various types.

Occasionally we’d end up using it in the tool room, as the cranes wouldn’t be available, then it was a bit of a pain as we’d be trying to accurately pick or place stuff without being able to move it a fraction one way or another.


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  #12  
Old 02-03-2019, 07:57 PM
Spencer Spencer is offline
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After getting the obstructions out of the blower and two new shear pins installed I cranked the jib up as high as it will go.

I figured I'd see if it loses any height over night, indicating an issue with the hydraulic lines, pump, or cylinder.
Well crap, not only did the weight from the snow blower make the crane drop by 18" = 24" in a 24 hour period, but it was definitely leaking oil too.

You can see in the second photo below that the oil was leaking directly out of the top of the cylinder. In the third photo below you can see the puddle of oil on the base of the unit.

I wouldn't mind using this cylinder as a learning opportunity on rebuilding these things. Some time ago I watched a YouTube video on rebuilding cylinders and it didn't seem too bad.

How hard is it to find the right type of rebuild kit? Should I reach out to the manufacturer directly to try and get a rebuild kit or is this something that I may be able to find either here in West Michigan or somewhere over in Detroit when I'm there on business?
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  #13  
Old 02-03-2019, 08:27 PM
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You could ask the manufacturer if they offer a rebuild kit, or you can just tear it apart to see what type of seal are used. Might just be o-rings. It looks like it is a simple displacement cylinder, so the only seal is around the top. As oil is pumped into the cylinder, the rod is moved out of the barrel. And then gravity brings the rod back down.

The seals can be just old, and getting brittle. We usually get our seals from a company called Hercules. They have some helpful videos and Diagrams on their website that might help you if you want to tackle the rebuild yourself, if that cylinder can be torn apart. Some are welded together, and not meant to be rebuilt. I can’t see the top to well in the pictures to tell how it comes apart. Some are easy, and some are not.


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  #14  
Old 02-03-2019, 08:34 PM
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Seems to me that means that it's leaking in at least 2 places: definitely from the top seal but probably also around the ram, allowing it to creep down. Or, I guess it could also be leaking back through the valve. I can't really judge from the pictures but there doesn't appear to be a lot of oil lost down on the base so some could have bled back into the reservoir.

I've been able to take the empty & cleaned up cylinder down to a local gasket supply house to buy replacement seals and o-rings. Didn't appear to be anything esoteric about them. They just measure them with calipers & match them from stock for 5 or 6 bucks.
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  #15  
Old 02-03-2019, 09:01 PM
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Yup, it's a Ruger.

Never seen another brand of those.

I think you could make one where the counterweight swung around.
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  #16  
Old 02-04-2019, 09:15 PM
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Ruger got back to me pretty quick, but didn't have good news for me. It seems Ruger changed ownership about 10 years ago or so.

The new owners stopped selling the rebuild kits right away, so all they have to offer me is to purchase a replacement cylinder for $1,410, which is more than I paid for the shop crane itself.

Even though the cylinder leaked overnight, I still used it to lift the new-to-me 75 Ton press off of the trailer.

This shop crane has a hell of a reach. That press is 8' tall and it was sitting up on top of my trailer. Then add the extra height for using the spreader beam/lifting beam.
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  #17  
Old 02-04-2019, 09:19 PM
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Quote:
Originally Posted by Spencer View Post
...I have a 120-volt Warn hoist rated for overhead lifting that I have attached to a glue-lam beam that is in a much more convenient spot in my shop, but I hesitate to put too much of a load on that beam...
Here I am using my 1,000 pound rated Warn hoist that is mounted to my glue-lam beam to help pull the new-to-me 2,000 pound rated Ruger shop crane with the new-to-me 75 Ton hydraulic press hanging from it into the barn.
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  #18  
Old 02-04-2019, 09:31 PM
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  #19  
Old 02-05-2019, 01:32 AM
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Spencer, you never said what you paid for either piece if equipment, but right now


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  #20  
Old 02-05-2019, 06:40 AM
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That crane could work for many years with that leak. Think of the leak as self applied anti-rust oil. just always keep in mind an escape plan if it starts coming down unexpectedly.

But if it lifted that press, it can’t be too bad. Did you notice any leakdown as you moved it in?


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