just wondering what kind of oring used for excavators coming from dealers or from brand new excavators? NBR viton etc?? thanks
Depends on the application, on hoses and hydraulic fittings NBR on most. But there are also Silicone , AC systems use HNBR and then Viton as you mentioned. Then there is duronmeter to consider as well. You would need to be specific about make, model , serial# and which O Ring you wanted.
main pump area control valve and swing motor?