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Subject: naa hydraulics

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Doug    Posted 04-07-2018 at 18:32:53 [URL] [DELETE]        [Reply] [Email]  
  • naa hydraulics
  • OK I am going to re-visit this, on my 53 naa we put in a new piston after doing some other work as well. I put in TSC UTF oh the trans, hydro, and rear end. The first few times running the tractor it took about 5-7minutes before it would lift the arms. Today I went to use it and after running for 20 minutes they still wouldn't lift. Do I have the wrong oil? What should be in there? Thank you.

    TheOldHokie    Posted 04-08-2018 at 06:12:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • Your problem is not the oil - your problem is a pump that will not prime. Possible causes:

  • Air leak or obstruction in the hydraulic suction line
  • Badly worn pump

    Did you have this problem before you did the other work?

    TOH

  • Doug    Posted 04-08-2018 at 19:16:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • It did not have this problem before we put a new piston in. I pulled the side cover off today with the tractor running moved the position control. The ram arm moves but the piston does not. I bled the pump and still nothing. When we drained the system there was a lot of water, maybe something with the pump itself. I want to try an put a pressure gauge on the bleeder of the pump. What should the psi of the piston pump be?

    TheOldHokie    Posted 04-08-2018 at 20:40:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • The proper place to test pump pressure is at the test port on the side of the centr housing. Pressure of around 2000 PSI. But if you aren't getting flow you will not get pressure. First order of business is to get flow.

    TOH

    doug    Posted 04-09-2018 at 06:07:15 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • where is the test port on the center housing?

    doug    Posted 04-09-2018 at 06:04:45 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • we cleaned out the manifold lines and used new o rings, new piston o ring and back up washer. we did use a cylinder from a donor rear end because mine was gouged pretty bad. like i said in the first post it worked a few times after running for a while. but now nothing, the pump has to be turning it has no choice. so in your opinion would you start with rebuilding the pump?

    TheOldHokie    Posted 04-09-2018 at 06:40:32 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • I would start by doing some empirical fact finding. Are you getting a good continuous flow of oil from the pump? Until you verify that you are shooting in the dark.

    The test port is a pipe plug on the lower right corner of the center section. You can check for oil flow there.

    TOH

    Doug    Posted 04-09-2018 at 18:26:39 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • So I pulled the plug on the pump and put in a barbed fitting and ran clear ode to the fill under the seat. Oil had air in it and was pulsating. Not a nice steady low. I also borrowed a gauge and put that n place of the pipe plug on the center housing. It never came off zero. Not really sure what else to check. Or should I go ahead and rebuild the pump at this point. If I pull the pump and spin it by hand would I be able to tell if some of the valves are stuck?

    TheOldHokie    Posted 04-10-2018 at 07:08:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • Sounds like the pump is worn out but you may be simply sucking air from a vacuum leak in the intake line.

    Do you understand that even with a good pump you will not get a pressure reading as long as 3pt lift circuit is open and passing oil back to the sump?

    Not to toot my own horn too much but this is what I would recommend as a long term fix for a worn out piston pump. Get rid of that proprietary, expensive, and unreliable OEM pump for good and replace it with an inexpensive industry standard gear pump.

    Gear Pump Conversion for Piston and Vane Pumps

    TOH

    doug    Posted 04-10-2018 at 10:15:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: naa hydraulics
  • can i call you on the number listed on your web page there?

    TheOldHokie    Posted 04-10-2018 at 15:36:55 [URL] [DELETE]        [Reply] [No Email]  
  • Re: naa hydraulics
  • Sure - any day EDT. The 655 number is my cell and usually gets answered. If not leave a voice mail and I will call you back.

    Dan

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