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Farmall & IHC Tractors Discussion Forum
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IH 574 hydraulic panic

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Wayne M Kittler

09-14-2004 19:49:45




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My IH574 has full use of all hydraulics- ps, 3 pt , pto and remotes until the hydraulic fluid hits a certain temperature. Then all hydraulic systems fail - ps first, then remotes, 3 pt and then pto, in short order. I would suspect the pump or safety valve except for the temperature condition. When the fluid cools to the correct temperature, every system works again but only until a certain temperature is reached. This is an odd situation. Hydraulic oil viscosity would not change so much that it all escapes through the pump or relief, would it? All help appreciated as I need to use the tractor for highway transport and can not seize up on the road.

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Harold Hubbard

09-15-2004 03:50:40




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 Re: IH 574 hydraulic panic in reply to Wayne M Kittler, 09-14-2004 19:49:45  
Do the brakes work right? If the brakes on these tractors disintegrate, the linings turn to sludge and wind up in the hydraulic pump intake screen and block flow to the pump. When the tractor is shut off, enough of it will fall off to let the hydraulics work again. Running the tractor stirs everything up and the screen plugs again. I think the temperature may be a coincidence if this is what's happening.

Another possibility is a thermal relief valve. The old C and Super C touch control systems had this, if the fluid got too hot the system would not work. I don't know if the 574 has one, I don't think they are common in newer equipment.

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JB2

09-14-2004 21:49:33




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 Re: IH 574 hydraulic panic in reply to Wayne M Kittler, 09-14-2004 19:49:45  
Hi, just a thought but does it have IH Hytran fluid only? Reason, a few years ago my brother bought a log splitter and he used it on his 454 and then after it ran for a while the brakes and ps would become spongy. The problem the log splitter cylinder had been full of detergent oil instead of hydraulic oil and it mixed with the IH Hytran in the tractor and it would foam after running for a period of time. Then the foaming air bubbles messed up the whole hydraulic system.

Good luck
JB2

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