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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Rebuilding Hyd. Cylinders

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Pete/ME

06-06-2004 03:24:58




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Is it rocket science to rebuild a hydraulic cylinder? I've never had one apart. There are guys around that do it, but if you don't need special equipment I could save some bucks if it's just 'o'rings.




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Neil

06-08-2004 17:25:12




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 Re: Rebuilding Hyd. Cylinders in reply to Pete/ME, 06-06-2004 03:24:58  
You should be able to find seals and repacking for almost all cylinders. I have a bobcat and forklift dealer that's been around for 50 years and found repacks for 3" oliver oc-4 cylinders.Even the person that sells parts for these said they were unavailable. just be persistent. both cylinders cost me $27 for both complete. Good Luck



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KURT (mi)

06-07-2004 17:40:15




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 Re: Rebuilding Hyd. Cylinders in reply to Pete/ME, 06-06-2004 03:24:58  
If your talking small cylinders, 5" bore and under with maybe 30" stroke then yes I would say its possible. You will need new orings, a glaze breaker on the end of a drill, maybe a machine shop could polish the rod for you, and get it rechromed if it in not pitted. Check for damage. and pressure check. You would save some dough. Remember that the smaller cylinders can be purchased through norherntool, or a local rebuilder in your area.

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jim/pa

06-07-2004 13:16:48




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 Re: Rebuilding Hyd. Cylinders in reply to Pete/ME, 06-06-2004 03:24:58  
only thing i'd add to what dale said is it depends on the size of the cylinder. 4" and under are doable with average backyard mechanic tools. over 4", you get into higher torque ranges. for instance the bucket cylinder for a 320 cat excavator is on at 3000 lbs/ft. thats a 6" cylinder, and i did one but had to borrow a crescent wrench that weighed around 60 lbs, and used 2 guys on the end of a 20 foot well casing to break it loose. it aint rocket science, its really very easy, just time consuming. oh yeah, keep everything very, very clean when you reassemble. good luck, jim

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Dale(MO)

06-07-2004 17:03:00




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 Re: Re: Rebuilding Hyd. Cylinders in reply to jim/pa, 06-07-2004 13:16:48  
Like jim/pa said, it's not difficult. Keeping things clean is a very important thing I failed to mention. I also recommend that right before you start to tear the cylinder apart, pour 3-5 gallons of hydraulic oil (preferrably used) all over yourself, starting with your head and going to the feet. This will eliminate you from trying to stay clean (haha).
Good luck!



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Dale(MO)

06-06-2004 08:42:02




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 Re: Rebuilding Hyd. Cylinders in reply to Pete/ME, 06-06-2004 03:24:58  
Pete, Getting them apart is usually the toughest part - and that's not usually very hard. I've rebuilt a lot of them over the years (Ditch Witch had poor hydraulics, but easiest to work on), and I've not found it to be a tough task. Just watch how things come apart, and make sure there are no burrs, nicks, or scratches on any of the mating metal parts. Take care not to damage any seals when putting it back together - that can make for a long day. Good luck!

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Pete/ME

06-08-2004 03:13:32




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 Re: Re: Rebuilding Hyd. Cylinders in reply to Dale(MO), 06-06-2004 08:42:02  
Thanks all. It's just a little 3" off a kelley backhoe. It's apart, but of course the piston seal is discontinued and non-standard--Kelley sells a replacement piston. Dale--great advice, reminds me of a neighbor, brought his brand new pick-up to the wood yard, grabbed a stick of pulp and smashed the side of the truck. "Now I don't have to worry about keepin' it pretty."



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jim/pa

06-08-2004 20:51:58




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 Re: Re: Re: Rebuilding Hyd. Cylinders in reply to Pete/ME, 06-08-2004 03:13:32  
just another thought on discontinued parts. i have a hydraulic rebuilder near me in north pa. that can get 99% of everything ever made. it may be a different material, but it'll work. if no other option new pistons are easy, and cheap to make on a decent lathe. jim



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