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Power beyond/load sense Hydraulics on 71/72 series case IH magnum
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IHhaying
Posted 10/7/2023 12:33 (#10431290)
Subject: Power beyond/load sense Hydraulics on 71/72 series case IH magnum


Rosenort Manitoba		Have been reading on here that apparently you can add power beyond to the older boxcar magnums. We pull 4760 Hesston balers with ours and was wondering if there’d be any advantage to using load sensing hydraulics for the chamber pressure vs just locking a lever back how we do now. Also what hoses and couplers are routed to the back with adding that? It looks like one of our tractors has the holes drilled in the plate by the valve block already. Thanks



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jj4910
Posted 10/7/2023 13:05 (#10431319 - in reply to #10431290)
Subject: RE: Power beyond/load sense Hydraulics on 71/72 series case IH magnum


SE Wyoming		Are the balers set up for open center?

If not I’d recommend converting them before trying anything power beyond. Especially if you’re having hot oil problems. Magnums weren’t designed to dead head oil under pressure for long periods of time.

The largest benefit from a return port is not pressuring the baler lines if you move the lever the wrong way. Not as big a problem on that series, the density system just won’t work if the oil flow is incorrect.
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IHhaying
Posted 10/7/2023 13:12 (#10431330 - in reply to #10431319)
Subject: RE: Power beyond/load sense Hydraulics on 71/72 series case IH magnum


Rosenort Manitoba		No they are set up for closed centre I believe. Right now the hoses go valve with solenoids that control the flow to the density cylinders. But some newer balers have their own onboard hydraulics for that so maybe this isn’t even a thing…
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jj4910
Posted 10/7/2023 13:33 (#10431348 - in reply to #10431330)
Subject: RE: Power beyond/load sense Hydraulics on 71/72 series case IH magnum


SE Wyoming
IHhaying - 10/7/2023 12:12

No they are set up for closed centre I believe. Right now the hoses go valve with solenoids that control the flow to the density cylinders. But some newer balers have their own onboard hydraulics for that so maybe this isn’t even a thing…


If you look in the operators manual you should be able to find the open center kit. Essentially what this changes is how the oil flows in the baler hydraulic system.

The factory or closed center set up was designed to work well with tractors that used a true closed center design like John Deere tractors at the time. Oil was pumped through the scv into the baler and held under pressure until the baler opened the increase solenoid and allowed the pressurized oil to enter the density cylinders.

This system worked well for the tractors that allowed it. However in a load sensing hydraulic system like the boxcar magnums this holding oil under pressure was seen as a load and it caused the hydraulic pump to go over relief whenever the baler wasn’t taking oil.

The open center kit removes the closed center plug, and replaces it with another solenoid valve. The additional valve will energize to stop the oil flow when the increase solenoid is energized then returns to a neutral state.

This allows the oil to flow back to the tractor in a loop preventing the tractor hydraulics from going over relief and overheating.

You will notice an instant noise difference from the tractor, and much cooler hydraulic oil.

The kit is easy to install and you will have to change the monitor over to open center for it to work.

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wheat fallow
Posted 10/7/2023 18:14 (#10431600 - in reply to #10431348)
Subject: RE: Power beyond/load sense Hydraulics on 71/72 series case IH magnum


west Nebraska northeast Colorado		JJ, a closed center flow and pressure compensated system (aka load sensing system) doesn't go over relief when oil is dead headed, the pump goes into high pressure standby and pumps just enough oil to put maximum pressure on the system. You are correct that these pumps are not designed to run constantly in high pressure standby, and doing so will damage the pump.
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jj4910
Posted 10/8/2023 02:11 (#10432017 - in reply to #10431600)
Subject: RE: Power beyond/load sense Hydraulics on 71/72 series case IH magnum


SE Wyoming
wheat fallow - 10/7/2023 17:14

JJ, a closed center flow and pressure compensated system (aka load sensing system) doesn't go over relief when oil is dead headed, the pump goes into high pressure standby and pumps just enough oil to put maximum pressure on the system. You are correct that these pumps are not designed to run constantly in high pressure standby, and doing so will damage the pump.


Thank you for the clarification- it’s been awhile since I’ve actually used that terminology. I stand corrected

I do however remember driving to the middle of nowhere Montana, and replacing a hydraulic pump on a 7110 that had the wrong loader valve plumbed into it. What a mess that was! Can still smell the burnt Hy-Tran!
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IHhaying
Posted 10/10/2023 18:26 (#10435141 - in reply to #10431348)
Subject: RE: Power beyond/load sense Hydraulics on 71/72 series case IH magnum


Rosenort Manitoba		jj4910 I told you wrong. The balers are actually using the open centre system. I also read in the owners manual that the bale density return hose should be run to a low pressure hydraulic motor return(case drain) which we haven’t been doing. Would this make any difference for the “hydraulic load noise” in the cab?
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