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Case 580 Super L Seal kits OEM vs aftermarket

heavyhaulhero

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Jul 1, 2025
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I just snagged a '99 Case 580 Super L from a contractor's sale, too good a deal to pass up! It's a project, for sure: 4WD, powershift, with a 4-in-1 bucket and extendahoe (serial in the JJG range).

Right off the bat, the boom cylinder seal is leaking like crazy. I'm wondering if I should go with Case's seals or try an aftermarket kit (saw some Indian ones on eBay). I won't be using it super heavily.

Has anyone used non-OEM seals on these older Cases with good or bad results? Any advice is appreciated before I get started.
 
I've used aftermarket seals on a 580L, some held up fine, others leaked quick, if you're not working it hard, cheaper kits can work, nut you should inspect cylinder walls first
 
I just snagged a '99 Case 580 Super L from a contractor's sale, too good a deal to pass up! It's a project, for sure: 4WD, powershift, with a 4-in-1 bucket and extendahoe (serial in the JJG range).

Right off the bat, the boom cylinder seal is leaking like crazy. I'm wondering if I should go with Case's seals or try an aftermarket kit (saw some Indian ones on eBay). I won't be using it super heavily.

Has anyone used non-OEM seals on these older Cases with good or bad results? Any advice is appreciated before I get started.
I'd stay away from those super cheap seal kits on eBay, especially for a main boom cylinder. The material quality on seals is critical, and a cheap one will often start leaking again in a few months, and you'll be doing the job all over again.
you know, it's not worth the headache. Go with the OEM seals or a quality aftermarket kit from a reputable supplier like Hercules Seals or Hydraulic Supply Company. You'll pay a bit more, but it's a one-and-done job
 
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