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allis1221G 
Orange Level
Joined: 10 Apr 2013
Location: Hudsonville
Points: 641
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 Topic: Help: D12 series 3 Hydrolic Problems
Posted: 28 Dec 2021 at 6:55pm |
Ive got a d12 series 3 that has weak hydrolics. Only apple to get 1100 psi pressure at rear outlets and 3 pt makeing it difficult to lift equipment. I have tried a different pump with no change and tried adjusting the inlet pressure relief velve on the spool velve according to service manual but that seems to do nothing. Wondering if anybody has encounted this issue or could point me in the right direction as to what to look at next to fix this issue. My other series 3 has 1850psi at an idol and im getting 1100 psi wide open on this tractor. Any help is greatly appreciated. Thanks in advance 
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DrAllis
Orange Level Access
Joined: 12 Sep 2009
Points: 21402
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Posted: 28 Dec 2021 at 7:01pm |
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I imagine the relief valve has a blown Oring and maybe a back-up ring. Pretty common for that type of relief valve. If you can aquire a seal kit from AGCO, be sure to back the screw adjustment DOWN to where it was or you may explode the pump. Be gentle with a hydraulic lever until you know the pressure is not too high.
Swap relief valve cartridges with the other tractor for testing.
Edited by DrAllis - 28 Dec 2021 at 7:01pm
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 53334
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Posted: 28 Dec 2021 at 7:06pm |
Best way of testing for a worn out pump is with a flow meter. OTC used to make one for IH that is the range of the D-10/12 pump(4-5 GPM) . If the pump checks out on the flow meter, then you have isolated that part of the system, and any problems will be downstream of the pump. From my own experience, the traction booster linkage is often the sticking point (if so equipped). Its a finicky adjustment, sometimes just move the levers, try, move again, re-try, etc, etc, etc... 
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JoeO(CMO)
Orange Level
Joined: 11 Sep 2009
Location: Cent Missouri
Points: 2694
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Posted: 28 Dec 2021 at 8:52pm |
Quick couplers-ball to ball. Ball to point does not. Point to point does.
suction screen in sump
Edited by JoeO(CMO) - 28 Dec 2021 at 8:55pm
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NormJ
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Joined: 13 Jan 2016
Location: Michigan
Points: 17
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Posted: 29 May 2022 at 9:12pm |
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How do you clean screen in sump?
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NormJ
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Joined: 13 Jan 2016
Location: Michigan
Points: 17
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Posted: 29 May 2022 at 9:48pm |
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I’m having the same problem. Everything was fine, was discing with 3pt disc then out of nowhere hydraulics wouldn’t lift disc out of ground. Had pump off and it checked out good. Fluid and filter are new. Swapped relief valves with a used one. Checked and lubed traction booster linkage. Can only get 200 psi at remote. Any ideas?
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DrAllis
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Joined: 12 Sep 2009
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Posted: 30 May 2022 at 7:11am |
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Well, a good pump and a good relief valve will yield a good hydraulic system that will lift a load. So, either your pump is bad or relief valve is bad. Nothing else. You say the pump "looked" good, but that in itself is not much of a test of the pumps performance. Relief valve has to have a good pump to test it for pressure settings. You don't have a "flow-rater" to test the pump. I could connect your pressure gauge directly to the pumps outlet ( dead-heading/ahead of the relief valve) and using the starter (with the coil wire unplugged) carefully crank the engine in short bursts to determine what, if any pressure the pump can actually make. Not a perfect test, but at least something. If that pump can make say 1,000 psi with the starter, which isn't as fast as the engine running, that's more than the 200 psi you say you have at the remote outlet. That would point the finger at the relief valve. EDIT: You blow up your hyd pump, it's on you, not me.
Edited by DrAllis - 30 May 2022 at 7:17am
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NormJ
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Location: Michigan
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Posted: 30 May 2022 at 2:54pm |
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Got it. Have you ever tried the deadhead test? I have read posts that the traction booster system can be a culprit also. What gets me is the system was fine, no issues then just got lazy. 2nd is the pump was pulled apart at a hydraulic shop by the owner and he said everything looked good.
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DrAllis
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Posted: 30 May 2022 at 3:10pm |
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Never had to dead-head test a pump. I've got the tooling to properly test it. But, in a pinch I do a lot of things not according to the book. If your valve stack has TWO relief valves ( right rear corner and left front corner) swap their position. This of course assumes one of them is still good. I can see the one at the right rear corner.
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