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1952 - 8N - 3 point hitch sticking

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Rob

07-19-2004 13:38:37

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I have a fine running 8N that I use at the cottage for pulling boats in and out of the water with a trailer and occasionally attach a rear blade to grade the small parking lot. This spring the the 3 point hitch starting sticking in the up position. If I shut the tractor off and wait 5 or 10 minutes, it releases all on it's own. Last fall I dumped and flushed the system with diesel fuel and refilled with new oil. I am guessing that a check valve somewhere is sticking. Doe anyone have any quick and easy fixes or solutions. Thanks..Rob

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ZANE

07-20-2004 05:31:16

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Re: 1952 - 8N - 3 point hitch sticking in reply to Rob, 07-19-2004 13:38:37

Sounds to me like the control valve is sticking in the pump and not moving as much as it should. It is probably some foreign material that got disturbed when you were working on the lift. I would try to rinse out the pump housing by pouring about 2 gallons of kerosend through the pump housing 2 or 3 times and each time letting ti settle so that any solids can drop out of the kerosene and be poured off and not put back in. When it is pretty clean then replace with new oil. 134 since you have the new type piston rings now. Take off the right side inspection plate and after the oil is replaced start the tractor and with your hand move the control rod back and forth till it is free. This usually will do the trick. If it has scored the control valve and continues to stick you may have to pull the pump out the bottom and remove the control valve and using some 400 grit sand paper polish it and put it back in with some oil on it and see if it is free moving now.

To elaborate on the above----- /
Message Added: Re: HYDRAULICS STUCK ON 8N-----PLEASE HELP!!!
The following information was added to the message board: Name: ZANE
E-Mail: wzsherman@aol.com
Subject: Re: HYDRAULICS STUCK ON 8N-----PLEASE HELP!!!
Body of Message: You have a sticking control valve. This can be a combination of problems. The first thing that can cause it to stick is dirty oil. The N hydraulics has no filter system and any and all foriegn material that enters the differential, transmission or the lift settles in the lower reaches of the lift. Unfortunately that is the home of the control valve and oil intake too. The best thing to do to remedy this dirty problem is to pull the pump out of the tractor and clean it. The other thing you can do is to drain all three places and rince the lift out with 5 gallons of kerosene. Pour it in as fast as you can through the inspection hole. Allow it to settle for a while and then pour it through again leaving the residue in the bottom of the container and discarding it. Do this untill no residue is in the bottom of the catch container. Add new oil. If you do take the pump out you should take the control valve and spring out of the pump and inspect the control valve for any wear patterns that might make it want to stick. The control valve can be polished by turning it in some wet or dry 300 grit sandpaper to smooth out any imperfections. This will make the vavle fit a little looser in it's bushing but if you don't get too carried away at it the difference in size will be inconsequential. The return spring that pushes the control valve back to the unload position can break or become weak from age and fatigue. Make sure it has enough tension to do a good job of pushing the valve back. If it is too weak the valve will not come back to the unload position with a heavy load on the lift no matter how clean or good fitting the valve is. The return spring is located under the intake valve in the pump. The intake valve is the one on the right.

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Rob

07-19-2004 15:52:46

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Re: 1952 - 8N - 3 point hitch sticking in reply to Rob, 07-19-2004 13:38:37

That would be a sticky control valve. When it opens the lift goes up and if it sticks open the lift just goes straight up and keeps trying to lift. That valve is at the bottom end of the vertical control linkage down from the lift cover to the pump. Maybe your kinkage isn't connected properly to the valve. You can open up the right side inspection plate and move the touch control, watch the linkage movement, and feel down in the oil for the valve plunger type thing to move in and out. The end of the linkage goes into a socket. Maybe it jumped out.
That linkage is suppose to be straight but I've seen em bent. My '51 was bent and that might allow them to jump out of the socket or hang. My lift did the same trick as yours a couple times.
Mine was bent and when I moved the little selector lever under the seat the lift arms jumped up or down about 6".

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