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Subject: 2N Hydraulics Problem

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Jack - Iowa    Posted 09-25-2018 at 17:50:30 [URL] [DELETE]        [Reply] [Email]  
  • 2N Hydraulics Problem
  • Running the sickle bar mower on a couple of different days I noticed the lift control lever would not stay clear down. Felt spongy.

    Then came the day when it hesitated on going down but then would not lift again. Arms move very freely.

    I have removed the right inspection plate and see some swirling of the oil towards the front of the sump. No leakage from above anyplace. Oil is clean and clear and full.

    Lift control lever moves fore and aft but needs adjustment as it does not start to move until the lift control lever is 1/4 to 1/3 of the way down.

    Lift fork appears to be attached.

    My first entry into one of these hydraulic systems so need some advice and guidance!

    Thanks,

    Jack

    Rustyal    Posted 09-25-2018 at 18:34:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2N Hydraulics Problem
  • You need chains to hold the mower at the same height. The link fork can be attached and not moving the valve. You can move the valve by hand. Tractor not running of course!!

    Jack - Iowa    Posted 09-25-2018 at 18:46:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2N Hydraulics Problem
  • So, if the link forks are attached and the valve is not moving, what is the fix? As I said, this is my first excursion into the hydraulics.

    Thanks,

    Jack

    PS: Mowed many acres prior to the trouble starting. Height was just fine. Last time I ran one of these was about 1943 I think. Hard to remember that long.

    Rustyal    Posted 09-26-2018 at 04:58:26 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2N Hydraulics Problem
  • If the valve is stuck just stick your hand into the oil and move it. Tractor off!

    Jack - Iowa    Posted 09-27-2018 at 07:58:42 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2N Hydraulics Problem
  • One major problem! My hands are too big to get down in there!

    I was able to feel the control valve plunger and it moves with the Touch Control Lever.

    I question if the spool is moving and have no idea how to check that.

    Also found the relief valve. Read an old post of TOH wherein he said some report being able to drain enough fluid to see if the relief valve is leaking. Not able to work on it today but when I do that will probably be my next attempt.

    Thanks,

    Jack

    Rustyal    Posted 09-27-2018 at 21:31:47 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2N Hydraulics Problem
  • Iím not sure what to look for if the valve is moving? Iíve heard of people having a problem with the relief valve. Not sure that would be your problem. Good luck.

    Jack - Iowa    Posted 09-27-2018 at 21:45:50 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2N Hydraulics Problem
  • Never having torn one of these apart I'm not sure just what is in that control valve. There seems to be the actuator rod, a spring, and the spool. I don't know how they are connected. Wondering if it is possible for the actuator rod to move and the spool to be stuck. No idea how you would check that.

    From what I've read the relief valve frequently causes problems. When I get back on it my intentions are to drain enough oil to see the relief valve and find out if it is leaking.

    I also read an article which, in the case of a stuck control valve, said to drain the oil and put 5 gallons of kerosene in. Don't remember the rest of the instructions. But where does one buy kerosene any more?

    Thanks,

    Jack

    Jack - Iowa    Posted 09-26-2018 at 11:25:56 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2N Hydraulics Problem
  • Valve does not appear to be stuck. I have very large hands but was able to force the right one in to where I could put a finger on the end of the valve shaft and feel it operate as I moved the Touch Control Lever.

    I have the right inspection plate off. Would I do better through the left?

    Jack - Iowa    Posted 09-26-2018 at 08:10:03 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2N Hydraulics Problem
  • I will do that this morning. Neither my FO-4 (Older version) nor my Parts Manual have a picture of the control valve or of how the linkage attaches. Does not matter as long as it works but satisfies my curiosity.

    Thanks,

    Jack

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