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JD 310A hydraulics making a banging sound?

comet424 ยท 2015-12-03 19:51

so I kinda confused JD says my pump is AR101288 but looking online I find other info http://www.reliableaftermarketparts.com/search/keyword/AR101288.aspx the AR101264 says if I have a Destroke valve which I do on the top plus that destroke side with the relay on it.... what would I have then? also the hydraulics making funny sound almost like when your water taps make a banging sound shutting valves off https://youtu.be/Cwa0zac2VFI and is the pressure in the pump supposed to drop after the backhoe is shut off or hold pressure? https://youtu.be/XTCIEcgR8CE

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