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Subject: Hydraulic fluid mistake

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Kevin    Posted 04-22-2017 at 19:56:42 [URL] [DELETE]        [Reply] [Email]  
  • Hydraulic fluid mistake

  • I put gear oil in the hydraulic sump. This is obviously an error in the extreme. Any thoughts on a fix? Obviously, drain that crap out of there. But what next?

    I made the mistake of working on the hydraulics, wiring, starter, and then taking a long-ass time to paint some of the parts. So it's hard rule anything out (or remember anything). When I finally got the thing running (last night) the hydraulics were not moving at all---the lift arms were in the full down position with the draft-control switch v. Only ran for a minute or so.

    Would appreciate any advice or ideas!

    36 coupe    Posted 05-08-2017 at 05:29:55 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Hydraulic fluid mistake
  • Your tractor was designed to use gear oil in the hydraulic system.

    KEvin    Posted 04-25-2017 at 12:45:00 [URL] [DELETE]        [Reply] [Email]  
  • Re: Hydraulic fluid mistake

  • I removed the bleeder plug on the pump and used compressed air in dip-stick hole to flush some UTF through the suction line to the pump. Looked like the right stuff coming out of the bleeder, clearish with a slight blue color. Seemed a little thicker than when I poured it in but not dramatically.

    So I set throttle to abou 1000 RPM and backed off the plug a bit. After a few turns, I got a steady seep of fluid from the bleeder.

    Kevin    Posted 04-24-2017 at 10:54:00 [URL] [DELETE]        [Reply] [Email]  
  • Re: Hydraulic fluid mistake

  • So I drained the gear oil and put in UTF. Lift arms (nothing attached) do not move. Draft lever is vertical. Tried at idle and about 900 RPM.

    I pressurized the hydraulic sump with about 40 PSI shop air through the dip-stick hole. It's sealed up enough that it does pressurize and when I remove the nozzel I get a fair amount of air pushing out of the sump. I tried that for a while but didn't get any obvious effects.

    I eventually got the plug out of the pump. Looked in and saw some oil slowly receding---looked fairly thick, more like gear oil than UTF. Then I pressurized the sump with the plug out and saw oil filling into the pump body. Should I keep going and flush this out a bit? At the time, I decided that I wouldn't add to the mess on the garage floor but now that I'm writing this, I see that it might be the right thing to do.

    Thanks for the help so far!

    Bruce(OR)    Posted 04-23-2017 at 01:05:16 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Hydraulic fluid mistake
  • GL-3? 4? 5?

    Kevin    Posted 04-24-2017 at 10:40:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: Hydraulic fluid mistake
  • Traveller SAE 90 from TSC, GL-1


    TheOldHokie    Posted 04-22-2017 at 20:14:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Hydraulic fluid mistake
  • What tractor and what makes you think it's a mistake? Many people prefer gear oil.


    Kevin    Posted 04-23-2017 at 14:10:26 [URL] [DELETE]        [Reply] [Email]  
  • Re: Hydraulic fluid mistake

  • Right. '54 NAA with the vane pump. Might be suffering from a priming issue. Have some UTF on-hand now. Wondering if I need to do any cleanup besides draining the 90W out.

    TheOldHokie    Posted 04-23-2017 at 14:30:46 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Hydraulic fluid mistake
  • Just drain and go. The UTF will be a lot easier to pull into the pump.


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