I hope this is not a repeat but I cannot find my previous post. The lift arms on my 8N have stopped working. I have looked at the fluid and there appears to be turbulence from under the oil like the pump is pumping. The selector shaft moves up and down when operating the sector control. I replaced the relief valve and still no lift. The PTO is turning as is the pump. There is no resistance at all in the arms. They can be raised and lowered by hand like they were not connected to anything. I have looked at the linkage and it appears everything is still in place. IDEAS???
- Thread starter Mcclellan
- Start date
Yep yopu can lift the arms up by hand and they move easy so that is as it should be. As for moving oil with the PTO in gear and the lift set to lift you should see little to no oil moving and if you do then that is the area that you have a problem like maybe blown pump gaskets or other such leaks
Grab the control rod while the tractor is running and push it forward toward the bottom end. If the lift then raises but still won't raise with the touch control handle the cam follower pin could be worn though and not allwing the control valve to be moved with the touch control handle.
Zane
ZANES LIFT STUFF
Zane
ZANES LIFT STUFF
I checked the control rod. It moves at the most 1/8" mostly up and down. It does have a slight front to back rocking motion. I tried to move it by hand and it does not move. At least not with my strength. I did switch from draft to position control and when "position" is selected the control knob lever is VERY stiff. There did not use to be any difference in the force required to move the control lever regardless of draft/position selection. How much should the control rod move if it is behaving properly and in what directions?
That is really useful information. The rod does not move front to back any more than a 1/16" at the most. I guess the next thing to to drain the oil yet again so I can see what is happening at the pump. The pictures are great!! They are far better than the ones in my manual. I can actually see what the rocker and rod are supposed to be doing. Thanks again.
As per the pictures and explanation from JMOR I drained the oil and checked out the intake control valve. It was not moving at all. I got up my nerve and really forced it and it popped into the pump. I think this is what Zane was saying yesterday and I wasn't clear about where to move it. I exercised the valve a bunch of times and it seems fine now. It probably should be replaced before it sticks again. I can't find the "intake control valve" listed as a separate part anywhere. Does anybody know if it has another name? Thanks to one and all. I have a 3/4 mile driveway the goes 500 feet up and I really need the box scraper to keep it up in the winter weather.
ntake Control valve is correct name. The Intake Control valve & it's bushing make up the valve and sticking is usually diry/products of corrosion, etc. & a good cleaning & a little light polishing generally frees things up. It isn't going to do anything but loosen up with wear of the metal parts, so I would say get to cleaning & not worry about replacement at this point.
That's sort of what I thought but it is nice to have it confirmed. I'll probably wait until the weather is better next spring and pull the pump. Don't want the tractor down in the winter when I need it for clearing snow and grading the driveway. Did the pictures you sent of the pump/valve come from a shop manual? If so is it available? Those pics were worth a thousand words and my manual just has grainy blobs for pictures.
&W pic from FO-4 manual. Old manual is only 30 pages and is here (no longer in print):http://www.linearrow.com/tractor/FO4.pdf
Also in new 150 page FO-4 which is available all over the place including in the YT store (this site), TSC, nnalert, on & on.
My manual is by the same publisher as the old one you reference but it is 103 pages. I looked at the PDF you sent and it looks just like mine except your version is a LOT clearer. Mine came with the tractor when I bought it 15 years ago. It is probably a copy of a copy of a copy etc. I'll check out the newer version. Thanks again for all the help.
Loose or broken linkage was the first thing I checked. It was so easy to move the liftarms by hand that I though something had failed. Now that I freed up the intake control valve the lift arms work better than they ever have. I replaced the relief valve since it had a leak. The arms now hold position when I put in the clutch.
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