Need help with 8000 series hydraulics

I'm looking for someone I can talk to about an Allis Chalmers 8030. Need help understanding the hydraulics. Im trying to get a pp 20 20 hydraulic drive to run my planter drive. I have the planter raise lower on remote 1, makers on 2 and hydraulic drive on 3. The problem I have is when the I get to the headlands (the drive isn't running anymore) I can't raise the planter but if I put the hydraulic drive remote in neutral it will raise. The tractor has about 20 gpm of flow. The drive only uses about 5 when it's running they say. So why is it when it's not using any flow I still can't raise the planter. I've played with the flow controls on the valves but that doesn't seem to make any difference. Any help would be greatly appreciated. A guy on ag talk told me about this form and a Dr Allis gentleman.

Edited by Kramer10 - 07 Apr 2020 at 11:21am

8000 series remote valves are all adjustable for flow. There is no priority valve ( usually #1) like some brands have. If you have 20 GPM from the main pump ( 8000 series are rated at 23 GPM at full throttle) and have one remote valve set for 5 GPM and a second remote valve at 7 GPM, the third remote valve should be able to be set at 8 GPM and each should maintain those numbers as long as you are at full throttle. So, I guess you need to set your planter drive remote valve flow at absolutely no more GPM than is needed and then dial the other two slower until everything functions without affecting each other.  Your tractor is considered a "closed center" hydraulic system or "pressure and flow compensated system". If your trying to use an "open center" system valve, it won't work right on your tractor. On your planter drive remote valve you MUST adjust the kick-out on that valve so the lever locks in and stays in on its own. You cannot tie that lever engaged with a tarp strap and expect things to work correctly.  Maybe your main hydraulic pump isn't adjusted to 2,500 psi max pressure ?? and 500 to 600 psi stand-by pressure ?? If either of these numbers are low, the performance of the system won't be what it should be.

Also check your hydraulic couplers.   Any leaks putting air into the system can cause problems too!

Do both of you guys have pioneer couplers (male and female) or do you have old style Allis (male and female)?

I had a loader on a 8010 plugged into the rear couplers and a little air into the system would make the loader work erratically.   You may also notice some oil drips or sweating. When I used the correct fittings it was 100% better.

Keep in mind these couplers are getting worn, and they might not work as good as they did new.   A new fitting is a quick fix.

Attached is flow control with pilot check assembly drawing. When higher pressure function is used on another remote the common passage shifts this valve towards closed and restricts the flow, trying to maintain same flow thru smaller opening but at higher pressure. Drilling face allows some flow to continue even if valve totally closes.      ok I can't paste the blue print pic from AC -  if you would like a copy send me your email at       bgtbran@hotmail.com and I will try to attach the pdf file.

Edited by tbran - 11 May 2022 at 10:52pm