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Ford 9N, 2N & 8N Discussion Forum
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8n lift only lifts at full throttle

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bigwade

06-28-2020 19:41:51




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Iíve been plagued with issues on the hydraulics on this 8n. After 2 pump rebuilds it started having an issue that the lift is now so weak it wonít lift an empty boom pole unless it is full throttle. The quadrant adjustment is all the way to the rear. It has a new style piston in the top lid that was recently replaced. It is full of fluid and leaking out of the bottom side cover hole. Iíve only had an issue with this before with very heavy implements.

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carlntexas

07-01-2020 16:02:22




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 Re: 8n lift only lifts at full throttle in reply to bigwade, 06-28-2020 19:41:51  
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You can put the side chamber gasket on backwards then it won't pump and you get to drop the pump again BTDT.



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TheOldHokie

06-29-2020 18:45:22




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 Re: 8n lift only lifts at full throttle in reply to bigwade, 06-28-2020 19:41:51  
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I have a dozen or so.

TOH



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bigwade

07-01-2020 06:13:37




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 Re: 8n lift only lifts at full throttle in reply to TheOldHokie, 06-29-2020 18:45:22  
Pulled the side cover and made it lift with the throttle at full throttle, saw turbulence on one side. On further inspection it seems the gasket on the pto side pump chamber busted out and was spraying fluid.



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JMOR

06-29-2020 11:34:59




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 Re: 8n lift only lifts at full throttle in reply to bigwade, 06-28-2020 19:41:51  
Quoting Removed, click Modern View to seeAny decent hydraulics supply house. I made mine faster than I could drive to town or order one. A 1/2 X 20TPI bolt as I recall , drilled thru, brazed to a 1/4 inch NPT nipple.



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TheOldHokie

06-29-2020 06:21:44




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 Re: 8n lift only lifts at full throttle in reply to bigwade, 06-28-2020 19:41:51  
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Chain the lift down, connect a piece of tube to the test port and run it back into the transmission filler. Start the tractor and measure the rate of flow coming out the hose both at idle and WOT. My guess is its nowhere close to the roughly 2.8 GPM the pump is supposed to produce.

TOH



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bigwade

06-29-2020 07:24:57




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 Re: 8n lift only lifts at full throttle in reply to TheOldHokie, 06-29-2020 06:21:44  
Is there any good place to get a fitting for the test port?



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