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49 8n Hydraulic Pump Rebuild

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Brad in MS

05-07-2001 12:39:19




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I've just completed a Hydraulic pump Rebuild on my '49 8n with new cam blocks, pistons and new valves. I also had to install a new PTO shaft, as the old one was apparently bent, and had to put some pressure on the old one to remove it. I also honed the ram cylinder and put in a new NAA piston.
In Position mode (lever up), the lift raises very fast, but in Draft mode (lever down), the lift raises much slower. I can hear the pump "thumping" now, or at least making a lot more noise now than before the rebuild. The lift doesnt drift down now, and can hold up an implement for several hours at least. Is the noise that I'm hearing supposed to be there? Is there something that I missed in the rebuild ? Should the lift raise as fast in Draft mode as Position mode ?
This is my first 8n (and my first post), so I'm still in the learning process...
Any thoughts or suggestions would be greatly appreciated.

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ZANE

05-08-2001 08:35:50




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 Re: 49 8n Hydraulic Pump Rebuild in reply to Brad in MS, 05-07-2001 12:39:19  
If the lift is properly adjusted it will raise just as fast in draft mode as in position.

See the link below.



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bg

05-07-2001 19:11:55




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 Re: 49 8n Hydraulic Pump Rebuild in reply to Brad in MS, 05-07-2001 12:39:19  
Did you re-adjust the draft control and position control linkages/springs, the control spring, and the quadrant after the rebuild? Zane claims that you can't accurately adjust the thing without a jig like the dealers use. (He sells one, btw)I never had a jig, so I've always adjusted mine by the book and fine-tuned by trial-and-error.



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