I have had problems with my 9600 header not lowering. The problem is worse after running and warming up. We have replaced most of the parts on the valve, just not the whole valve block (expensive). Replacing the o-rings and plungers and what not has helped but on occasion it still will not go down at will. Sometimes when it hangs up I have had to wait a full 20-30 seconds for the header to lower to an acceptable point to resume cutting.
Anyone else have a know anything about what might fix this, or is it just rebuild the entire valve block?
Seen this a few times, would just about bet money on it is the suction screen inside the hydraulic reservoir. Drain the oil out of the reservoir and remove the fittings and you will see there is a screen that is not mentioned anywhere that fills full of crap. Hope this is the fault
I'm almost certain there is a throttle valve in the header circuit back on the left side of the shoe close to the accumulator. It's not the valve on the end of the accumulator but somewhere close by. If I remember right it looks like a small bolt with a jam nut on it. I think the 50 series were the same and it isn't very obvious when you're searching for it. Turning it out is faster.
I can't remember how far back in time the feature goes, but for quite a while the header height button has been two stage for both raising and lowering. Pressing the button part way will cause a slow steady movement. Pressing a little harder to the second click raises or lowers it at a much faster speed. It's easy to forget about this feature on something that spends most of it life in storage.
Try adjusting the rate of drop valve on the header raise/lower valve block. This adjustment should be in the opps manual. Its the only adjustable valve on that block. It looks like a bolt with a jam nut. This valve does need replaced sometimes. Accumulator shouldn't cause that, to eliminate it from the system just screw the valve down. I you have pressure and other functions are not slow (like reel functions and unload auger swing) your pump is probably ok. If the rate of drop valve doesn't fix it then install the poppet kit. This kit includes the load check poppets and the header lower valve. FYI this is the kit you get for a header settling problem also.