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Subject: naa hydraulics

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Doug    Posted 03-10-2018 at 21:52:03 [URL] [DELETE]        [Reply] [Email]  
  • naa hydraulics
  • On my naa we just did hubs and what not on we tackled the hydraulics that have always dropped on me. We changed the piston, new o ring and wiper. We put in a new hydraulic safety valve assembly. We did remove the pump from the top plate to clean it up but did not mess with any of the position arm or draft linkage. Wilkes all the reservoirs with oil today and fired her up. After realizing it was in draft mode we began to bleed any air from the system that we could. Once it started to work as it should and all the air was gone it still drops then jumps right back up. Quicker than before but is still doing the same thing s before. We pulled the fill plug and can not see any oil getting by the oring and or wiper on the new piston and it doesn't look like anything is coming from the safety valve assembly.please help I am at a loss. Thank you.

    Doug    Posted 03-12-2018 at 12:15:54 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • i am sorry we removed the cylinder from the top plate. question on the safety relief valve assembly, the one we removed had a ball with it and the bottom of the valve had a cup the ball fit into. the new one was flat with no cup, so we didn't use the ball, should that be back in there?
    i have had three or more responses that my problem could be the control valve, is that part of the cylinder? we used a cylinder from a donor rear end i picked up from Kirk. this is something my tractor did before we tried to fix it, what are the chances another cylinder would do the same thing?

    WayneIA    Posted 03-12-2018 at 12:49:58 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • Sound like you replace the whole cylinder safety valve as an assembly, so it should be fine. The control valve runs in bushing which is in the cylinder casting.. A used cylinder assembly might be better, but it is also used, soooooo, take your chances. One other thing. Make sure you have a good gasket between the cylinder assembly and the lift chest, also the spacer gaskets under the two opposite mounting bolts.

    doug    Posted 03-12-2018 at 13:10:46 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • the new safety valve had no ball with it, should that have been left in there? if i am thinking about the same two bolts you mentioned we didn't out anything in there as a washer or a spacer. nothing was in the top plate rebuild kit for that. we had a whole bunch of o rings we didn't use but they would have been to thick for that.

    WayneIA    Posted 03-12-2018 at 13:27:51 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • There should be a ball, special washer and spring ahead of the valve body. If this truly an NAA, there is a gasket and two special washers between the cylinder casting and the lift chest. No o rings..

    doug    Posted 03-12-2018 at 13:40:53 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • can i get your email to try and send you a couple pictures, i have zero luck posting them on here. i work better with installations. i want to be sure i have the correct parts and terminology

    WayneIA    Posted 03-12-2018 at 13:44:12 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • mameyer@netins.net

    WayneIA    Posted 03-11-2018 at 20:00:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • There are three ways for the lift arms so settle down. A leak past the piston seals, the cylinder overload safety valve or the control valve. you have determined the cylinder seals do not leak .Pull the PTO shifter cover and look at either end of the control valve. The front will be very close to the transmission, and watch for oil drips, Engine off. 99.9% chance the cylinder safety valve will not be a problem. You more than likely will not be replacing the control valve and bushing unless you love spending lost of money.

    Rustyal    Posted 03-11-2018 at 18:27:16 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • I always think wore out lift cylinder when people say it goes up then back down. The cylinder wears at the top.

    Tim Daley(MI)    Posted 03-11-2018 at 04:29:31 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • I concur with JMOR, as you state a lot of confusing information. The NAA hydraulic system is different than the 9N/2n and 8N systems. You shouldn't have to 'bleed' out any air in the lines. The pump is not on the top cover, but the hydraulic cylinder and ram are so perhaps that is what you meant to say. I don't think you can view the cylinder action simply by removing the fill plug. Here is short tutorial on the NAA hydraulic repair -see LINK.

    Tim Daley(MI)

    R Geiger    Posted 03-11-2018 at 12:19:20 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • Tim, The video really shows little or no help in troubleshooting. The place for information is, as always, the service manual for the tractor being worked on.

    JMOR    Posted 03-10-2018 at 22:03:39 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • "We did remove the pump from the top plate to clean it up but..."
    You need to understand more than that before I can even begin to help you.

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