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Ford 9N, 2N & 8N Discussion Forum

early 8-N lift arms always go the whole way u

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tugboat tim

05-20-2004 05:40:27

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my front dist. 8-n lifts the 3 point when first startin the pto while this sounds kinda small my bush hog is a pull type and i used to use the lift arms to connect the toung to. I've already rebuilt the hydrulic pump changed the fluid and tried aadjusting the little ajuster on the side of the case by the up/down control thanks in advance

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05-20-2004 13:53:53

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 Re: early 8-N lift arms always go the whole w in reply to tugboat tim, 05-20-2004 05:40:27  
There is an intake valve and an exhaust valve in the 8N pump. The intake valve is spring loaded closed and it is opened when the rocker on the pump is moved so that the intake is pushed into the bushing in the pump. This allows oil to be drawn into the pump chambers. When the intake is pushed in the exhaust valve is pulled out by the action of the other end of the rock shaft which is where the exhaust valve is connected. The valve is actually connected on the inside of the spool of the valve by a spring that is retained by an internal snap ring in the exhaust valve spool. If the snap ring gets dislodged or the spring is broken the exhaust valve can not be moved mechanically and the results are that the lift will usually go up but will not come down. Usually when this occurs the lift will cause an extreme load to be exerted on the system and the engine can even be loaded. This can bend the control valve rod when the ram cylinder is pushed out too far against the pin on the control valve rod that is supposed to disengage the control valve to it's neutral position but if the exhust valve is disconnected this can't be done and the result is a bent control rod and maybe other damanges as well. Of course the lift won't come down either.

Then it can be just a simple stuck control valve;
Or it can be that the ports in the sleeve of the exhaust valve are pluged with some foriegn material and if it is the only fix is to remove the pump, drive out the exhaust valve bushing and clear the ports in the bushing.


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05-20-2004 10:14:14

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 Re: early 8-N lift arms always go the whole w in reply to tugboat tim, 05-20-2004 05:40:27  
Just cured my 8N from lifting all the way up and won't come down. You need to remove the inspection plate. On the right with the dipstick in it.
Check to see if the arm moves the control valve when you move the quadrant. You have to reach down and feel because the control valve is at the bottom on th backside of the pump. That has to move freely. There might be something blocking the control valve flow or, as I understand it, the oil passages might be blocked.
That valve is just a piston kind of thing that moves in and out. You may end up flushing it real good to get a bit of crud out that is blocking the valve. You may have to pull the pump and clean it out. Check the valve movement and if that's ok then start it up and see if there's any swirling or squirting (not good). I had a blown gasket (weak lift) and seems a chunk of the gasket would get in to the control valve and the lift would go straight up and stay there. I'd fiddle with the controls and clutch and it would come down but a week later it would do it again. Had to remove the pump and replace the gasket.

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