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Hydraulics Wouldn't Lift...

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gahorn

08-09-2004 09:40:43

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Came back from a 3 week vacation and tried to mow the runway. Pulled the 9N out of the hangar, took it over to the bush hog to drop off the Lift-All, and the lift worked fine.
Dropped the Lift-all and moved over in front of the mower and found the main control spring was a bit loose. Tried to screw it in to tighten it, but it's frozen solid on the plunger-guide, so gave up. Hitched up the mower and found the lift arms wouldn't lift. Removed the mower, and the lift arms still wouldn't lift. Checked the gear oil/hyd fluid level and found it full. Removed the right-side inspection cover and saw the pump pistons turning, so I shut down the tractor and plunged my hand down in the oil and felt around a place I'd never been before. Felt the control valve ball-ends were loose and not connected to the Forks. Drained the fluid, and thru the drain-hole and the inspection cover hole was able to re-install the control valve ends into the fork. Put it all back together, installed fresh fluid, and ....Success!! Works beautifully. Question: What on earth would cause the control valve arms to pop out of the forks? Was this due to my playing with the control spring? Is it really necessary for me to take out all the slop in my control spring? And how do I do this if it's stuck without disassembling all this again?

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ZANE

08-09-2004 18:11:00

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Re: Hydraulics Wouldn't Lift... in reply to gahorn, 08-09-2004 09:40:43

Yes you did yank the control valve loose trying to tighten that yoke on the big draft sencing spring when it wouldn't turn. If you try hard enough you can break something too.

Really that spring being loose has very little effect on the operation of the lift. When the implement is hanging on the top link as in a bush hog or boom pole the spring and it's linkage is not engaged at all and has no effect on the lift. If you were plowing the effect of the plow making contact with the ground would put positive pressure on the draft spring and effectively eleminate that looseness that worries a lot of people and the loosesness will not have any effect on the effectiveness of the draft sensing mode.

You can tighten the spring yoke by heating it almost white hot around the threaded pard of the yoke and then try to take it off. Once you have gotten it off you can put a little oil in the threads and then re install the yoke and it will tighten enough to take out the looseness.

So the moral of this story is don't fiddle around with the loose spring. Don't worry, be happy!

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Rob

08-09-2004 09:55:28

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Re: Hydraulics Wouldn't Lift... in reply to gahorn, 08-09-2004 09:40:43

It's your lift. If messing with the spring pops the control arm off the valves then don't do that. Just kidding, kinda.
Slop in the spring isn't right and you can leave it but there may be problems now and then. You might start soaking it with BreakFree, CLP (WalMart gun dept) or some other quality penetrating oil. Give it a squirt now and again and one day you can adjust that thing. The threads are not under the yoke, they are on the other end of the shaft next to the lift cover.
If that pops off again you don't have to drain anything to fit it back. I just went through my lift and it was heavy but it sure works good now the adjustments are all correct and everything is tight I stuck in a new ram piston while I was at it, $25 from New Holland. My cylinder was fine. My problem was the control arm was not straight and the lift arms shifted postion when I went from position control to draft control, doesn't do that now.

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gahorn

08-09-2004 14:27:28

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Re: Hydraulics Wouldn't Lift... in reply to Rob, 08-09-2004 09:55:28

Rob, that's not correct according to my TO-4 manual. The threaded portion of the plunger is near the yoke, not near the bottom of the spring. In fact, it appears it's hidden from view within the plunger guide according to Fig. FO144 on page 95 of the manual. I can only guess at how to get lubricant onto those threads.

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Rob

08-09-2004 15:05:48

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Well you're right about the threads. in reply to gahorn, 08-09-2004 14:27:28

Maybe I was thinking about how it was rusted up the other end too. Now you mention it I remember that rod and the little yoke in the lift. Little moisture gets in the lift back there. There's a felt seal in there. I oiled that up and hope it does a better job stopping moisture.
That BreakFree comes with a skinny little straw and you should be able to get it in there. Helps some that the spring is loose, maybe. You might end up getting more on the tractor than in the threads but that's the breaks. (No pun intended)
I ended up with mine turning free. Didn't take that much. I guess I started a couple days and sprayed it a couple times before I got to it. You aren't in a big hurry anyway are you?

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