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8N Hydraulics Again ...

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John

04-16-2001 05:13:42




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How can I tell if the problem is with the pump or the lift? My 8N lifts my bush hog (500 lb.) inconsistently, and gradually drops while in use. A tug on the top link will usually start it lifting, but it won't stay level while mowing; always drops. The control lever is in the position control (vertical) position.

Any help is appreciated.




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Mark 8N*126975*

04-16-2001 07:38:23




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 Re: 8N Hydraulics Again ... in reply to John, 04-16-2001 05:13:42  
I recommend a video from J&D Productions, Inc. on Hydraulic Overhaul repair and troubleshooting.
P.O. Box 38
Metamora, MI 48455
You can do an overhaul yourself for around a $100
in parts.



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bg

04-16-2001 05:54:56




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 Re: 8N Hydraulics Again ... in reply to John, 04-16-2001 05:13:42  
The "tug on the top link" remedy suggests to me that the linkage needs attention. It could also mean there is a leaking valve. If you don't have an I&T FO-4, get one and do a complete diagnostic/adjustment. The top link activates the inner linkage. The draft control and position control links as well as the large control spring on the outside must all be adjusted corectly. Then you have other variables, such as the quadrant adjustment, lift piston and cylinder, control arm(bent or straight?), hydraulic oil(clean, dirty, full of water?), worn valves or seats, dirt or trash. You can do a pressure check on the pump as outlined in the FO-4.

Remove the right side inspection plate and observe what's happening before you tear into it.

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