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Subject: 8N hydraulics

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jeff walker    Posted 02-19-2018 at 22:24:22 [URL] [DELETE]        [Reply] [Email]  
  • 8N hydraulics
  • I dropped the hydro pump from a 52' 8N I recently acquired due to the condition of the oil drained from the tractor. After cleaning the pump thoroughly, I reassembled with new gaskets, wear on the pump components did not seem excessive so I reinstalled into tractor. I also pulled the cylinder and piston, honed cylinder, installed new o-ring and leather ring on piston, reinstalled in tractor,filled reservoir with the correct Ford oil. Ran tractor for 15 minutes while working the position lever up and down to remove air from system, lift arms come up quickly without a load but will not lift a load. Any suggestion?

    Tim Daley(MI)    Posted 02-21-2018 at 07:26:24 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N hydraulics
  • Did you install a new safety relief valve? What type of oil did you use and how much? Did you check the level after refilling? When the lift is fully raised without a load and the tractor shut down, can you push the lift arms down? Try it in both DRAFT control and POSITION control. Raising and lowering the lift several times and running the tractor around, may the get oil circulated more. Then try raising the lift without a load and remove inspection covers to see if any leaks are present from cylinder after raised and shut down. See if will raise a load then repeat. I'm not a fan of honing an old cylinder; I've never seen it do any good. The hydraulic system repair isn't difficult, just time consuming and removing the top cover is not a job to be done by yourself, though I have done it many times, yet recommend you get help. I now suggest replacing the cylinder, piston, O-ring, and backup washer/wiper with new parts since the top cover is already off.

    Tim Daley(MI)

    TheOldHokie    Posted 02-20-2018 at 17:04:08 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N hydraulics
  • Did it work better before you fixed it?


    jeff walker    Posted 02-20-2018 at 23:18:40 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N hydraulics
  • I pulled the tractor out of the weeds, don't know it's history, I'm putting a flathead v8 in it.

    John in Mich    Posted 02-20-2018 at 16:15:55 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N hydraulics
  • Not mentioned is excessive honing. If cylinder was as pitted or grooved as some that I have seen it should be replaced.

    Jeff    Posted 02-20-2018 at 15:08:46 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N hydraulics
  • Thanks for the info, I'll work on those suggestions tonight .

    deanostoybox    Posted 02-20-2018 at 01:20:31 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N hydraulics
  • What O ring did you use? If you got the gasket set that is sold by several vendors which does not have the O ring and leather washer in the description, but does in the gasket set when you get it, the O ring is too skinny. Probably why they don't mention it in the description:-)

    Don't even ask how I know that:-(

    BlasterStumps    Posted 02-19-2018 at 23:15:20 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N hydraulics
  • since it is not building the right amount of pressure, the exhaust control valve may be sticking. Pull the right side round cover off...

    with the tractor shut off,

    reach down thru the hole and try to move the exhaust valve against it's spring. If you can't move it, then it is most likely stuck.

    I believe you can replace an exhaust valve without removing the pump. I haven't attempted it though.

    JMOR    Posted 02-19-2018 at 23:11:53 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N hydraulics
  • Chain the arms down & measure the pressure at the test port.

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