JD 4300 Rockshaft help with diagnosis

[blaplante]

Hello all,

I have a 2000 JD 4300 that seems to have a problem with the rockshaft. With implement attached (plow, landscape rake or boxblade) I experience what I would describe as bleeddown and a reset by the position control, regardless of height. Ive found a couple of good threads in rergards to this and to the inline screen on the 4300's and an updated high pressure filter- I have the former. My question: Is there a way to tell if this is a problem with the rockshaft cylinder itself or a problem with the valve. Because it happens at any height, I dont think it is correctable with the rockshaft stop adjustment. I did hang the boxblade on there last night and closed the rate drop adjustment- blade was on the ground this morning. Does this indicate a problem with the cylinder or could it still be a problem with the valve. Is it possible that changing to the new filter might alleviate this. Thanks for any input/ info you have to offer.

2000 John Deere 4300, Hydro, 430 Loader 60" 7 Iron

 

[shot_gun]

If the rate of drop vavle is in good operating condition yes you have cylinder leakage. The only thing eles it could be is the load check valve. When you set the hieght control lever whith something on the back does it jump up every minute or so if you don't move the position control. If it does chances are that the cylinder is leaking.

 

[blaplante]

Thats about right, little longer in between for lighter implement like the rake. My next question would be is this something that needs to be fixed right away to prevent damage to other components, or can it wait a little bit. Not sure how long it will take me to fix- anyone else been there done that so to speak. If so, any tips/ hints or pitfalls to avoid? Is this a common repair - result of wear over time or is this an unusual problem. Tractor has about 750 hours. Thanks again