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Subject: Troubleshooting hydraulic lift and lower

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Steve Pfost    Posted 06-03-2019 at 10:00:50 [URL] [DELETE]        [Reply] [Email]  
  • Troubleshooting hydraulic lift and lower
  • Hi again. So Iím back troubleshooting this. I drained the milky hydraulic fluid and removed the inspection plate with dipstick. When I drop the control lever down there is zero resistance and even the control linkage inside doesnít move or hit resistance until the lever reached about maybe 1 1/2- 2 in from the bottom of the lever guide. Iím trying to understand the motion these items go through to figure out if something is stick and where that something may be. Looking at the shop manual could it be the exhaust control valve or intake intro valve? I suppose another question to help this is When the lever moves down where should it be hitting itís resistance? Or is it that the friction pad or something on the exterior is not correct? Before a novice like myself start thinking with the wrong items I figured I would ask for some trouble shooting. I received the tractor like this so I have no idea how long itís been like this.

    Tim Daley(MI)    Posted 06-04-2019 at 07:42:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • 9N/2N system or 8N???

    TPD

    Steve Pfost    Posted 06-04-2019 at 09:23:48 [URL] [DELETE]        [Reply] [Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • 9n

    K.LaRue-VA    Posted 06-03-2019 at 11:21:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • Looks like you are missing the washer, castle nut, and cotter pin that go on the external end of the touch control shaft. Adjust tension of the castle nut so the friction disc holds the touch control lever in place. It should take 4-5 pounds of force to move the touch control lever.

    If the quadrant needs to be adjusted, four bolts that hold touch control to the top cover are in slotted holes. Loosen those four bolts just enough so the touch control lever assembly can be moved in relation to the top cover. The quadrant is adjusted correctly when the lift arms start to drop when the touch control lever is moved 2-5/8" to 2-3/4" down from the top.

    Steve Pfost    Posted 06-03-2019 at 11:29:30 [URL] [DELETE]        [Reply] [Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • I removed the castle nut before the video and the. Retightened it. The friction disc seems to be fused to the lever and I was trying to listen and tighten it back up. It moves with the lever. And those numbers, do you mean 2-5/8 from the very top or from where the opening for the wing nut begins. Is the quadrant adjustment something that has to be performed on the regular due to regular movement of the lever and vibrations of the tractor?

    K.LaRue-VA    Posted 06-04-2019 at 13:26:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • The measurement is from as far as the lever will go up. The 9N lift should drop to the ground somewhere between those two numbers. The rest of the lever movement down from that point is used to set how deep the plow will run in the ground. The wing nut stop is used to mark the depth you want to plow so each furrow is the same after raising the lift and starting a new furrow.

    One of my tractors was adjusted close enough when I got it. The other needed an adjustment after fixing some problems with the linkage under the cover. I have not felt the need to check the adjustment on either of them in several years.

    Steve Pfost    Posted 06-04-2019 at 14:00:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • I donít have my manual with me at the moment but I figured I may need to adjust the control spring underneath the top housing. Right now I havenít the conditions to remove the top and it seems acceptable for what I need it to do. Thanks for the follow up which sort of confirms my thinking! Iíll be putting the fluid in today to get it back up and running to level my land with a blade.

    JMOR    Posted 06-03-2019 at 10:41:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • If control valve is free to move and the friction plate on touch control lever is adjusted to offer no friction, then the only thing you will feel at touch control lever will be the stretching of the fork retracting spring as you move toward Lower. The same spring is working to help you move the lever toward Lift (relaxing the stretch).

    Steve Pfost    Posted 06-03-2019 at 10:57:56 [URL] [DELETE]        [Reply] [Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • Hereís a video, maybe this could help. It may be back to normal now after the quadrant adjustment. Can someone explain why the quadrant needs to be adjusted?

    https://youtu.be/H7GOpbHnh44

    And a second one

    https://youtu.be/BobcBAiABJQ

    JMOR    Posted 06-03-2019 at 15:16:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • Initially, when first built, the reason was that of the several components between your fingers and the control valve, none were manufactured with a tolerance of 0.000001 inch (i.e., about perfect), so adjustment was necessary to make control move to a specified position with lever in a specified position. 70 years later, adjustment is needed due to wear in the several components of that linkage. And the need to adjust should be very infrequent! 2 5/8- 2 3/4 is not critical at all. That is the 'working point' of lever and you can actually set that point pretty much where you like it.

    Steve Pfost    Posted 06-03-2019 at 18:06:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: Troubleshooting hydraulic lift and lower
  • Ah yes, I figured as much. My only concern through the process was making sure that I'm not complicating any issues in the pump area. All seems to be acceptable. Thank you all for the help.

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