Posted by Will Cotter on December 17, 2013 at 10:30:24 from (208.53.79.199):
Hi All, I recently inherited my father-in-law’s 9n (I think it"s a "44 or "45), and got it running thanks in no small part to all the great info on this forum and the other 9n forums. But now I’m having three point lowering issues again.
When I first got the tractor, the hydraulics would lift the box scraper just fine, but wouldn’t lower. I dropped the pump, cleaned it all out (including the tiny little ports inside the pump bushing), ran several gallons of diesel through the tranny and pump cavities, and wiped out as much of the sludge as I could. Dried it with air, put it all back together with new gaskets and a new safety valve (just in case), and everything worked great. For about two days.
Now I’m back in the same boat: it will lift fine, but will not lower unless I loosen the top bolts by the hydraulic drain tube and let some of the fluid drain out and bleed the pressure off (the test port on the bottom pump plate was welded or brazed closed at some point, so that isn’t a pressure relief option right now.) I’ve pulled the inspection plate, and the hydraulic valve is definitely connected to the control arms and moves back and forth fine.
I’ve read every post I could find related to the hydraulics not lowering, and now I’m stuck. Just wondering if anyone has any suggestions of something else I could try, or do you think I just have to drop the pump and try cleaning everything again?
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