live and learn 560D

Hayfarmer

Well-known Member
Last spring after getting info here I removed the sideframe and replaced O rings in oil cooler on 560. Not a real fun job but stopped the leak. This fall after less than 100 hours the Orings were leaking again. I replaced them the first time with ones from my Harbor Freight O ring kit that were supposed to be oil resistant. They had turned hard quickly in fact were leaking worse than the ones I replaced in the spring. I have gotten some good stuff from Harbor Freight but these O rings weren't one of them.
 
I've never been in a Harbor freight, always kinda wondered if I was missing anything, doesn't sound like a very strong personal indorsement from you.
 
Last company I worked for made the timer clocks and valves for water softeners. China tried to backward engineer our valves, lots of rubber washers and o-rings in them. Our engineering standard was to make our valves last 30 years of residential use. And we tested all new parts in our lab to those life expectancy standards. We actually bought a couple of the Chinese built valves and tested then. Worst one failed in less than two weeks, best one failed around four weeks. The rubber washers and o-rings looked like standard cheap parts but they weren't.

I'd make sure the o-rings for the oil cooler on your 560 come from Parker or National. Plain old Buna-N rubber or Nitrile should be fine, just different names for same material. If you do a Google search, there are Chemical Resistance charts for all the different rubber compounds on the Internet.
 
Yup, one O-ring failure, so everything from Harbor Freight's junk... Doesn't matter that they were the wrong ones to use from the get-go...*sigh*

Regardless of who you bought the assortment from, they're the wrong type of O-rings for that application. The assortments are all the same, from the same factory, no matter whether you buy from Harbor Freight, or the Snap-On truck.

They're the wrong kind of material, wrong durometer, and wrong dimensions for hydraulic/oil/fuel applications.

I have no idea what those assortments are good for, except maybe to separate you from $10 of your hard earned money...
 
I didn't mean to imply that all harbor freight stuff was bad at all. I have a power hacksaw from there that seems to work fine, I wouldn't buy a tool there that I was gonna use everyday in my business. My IH dealer is about 70 miles away and whn I used these O rings they were the right size and since they said they were oil resistant I figured they would work. I will still use them in places I can get to easily or light duty.
 

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