3 point drops farmpro 2425

[nvnenzel]

New to this whole thing but this looks like the place for help.
I have a Farm Pro 2425 which I understand is a Jinma 254 knockoff. The tractor has just 27 hours on it, guy bought it and it was too small for his construction business. It does a great job for what I need but the three point drops no matter what I do, even if I don't have the box plow attached. I've closed the 'knob' under the seat but then I can't get it to raise. If the engine is running I can't even turn the knob to control the attachment raise lower speed, but turning the knob doesn't seem to stop the drop anyway. I have a small leak in the raise/lower valve but the attachment seems to drop more quickly than that small leak would justify, but of course I could be completely wrong. I guess my first question is where do I start. I've seen the posts on blowing air through the lines to see if I get a 'gurgle' bypassing the main cylinder, but at what point in the line etc. I have the original manual but it reads like an english translation from chinese by a half blind baboon. (for instance, after adjustment has been spared length resolve to rotate lock for safety to operator.)

 

[Soundguy]

Has the lift ever been run past it's intende dmax height? if so, it's likely that the oring ont he piston has been cut.

Try posing this in the section dedicated to chinese tractors.. there have been discussions on lift R&R before.. including diagrams.. etc.

soundguy

 

[nvnenzel]

I think more than likely. I gather the dmax is an upper limit on the upstroke and I personally ran the 3-point up as high as it would go with no load and with a load. What is a dmax limit.

I'm new to the board but your advice sounds good, I'll head to the chinese tractor section and post the same idea. Thanks.