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Farmall & IHC Tractors Discussion Forum
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2500 or 574 help (long post)

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chadd

06-15-2007 00:09:44




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Well I was out cutting hay for 8 hours and I was curious if anyone has an idea what is going on. The ambient air temps outside were 80 degrees F but I put a thermometer in the cab and it averaged 115 degrees F. Basically, I am getting roasted. It has underslung exhaust running under the cab, but in truth, most of the heat seems to come from the hydraulics. The rear remote valves and loader control valves get scalding hot to the touch along with all lines dealing with the loader and remotes (for some reason the steering lines stay cooler, but they have air blowing over them from the engine fan). Also the tractor seems to labor against a load that isn't there. It is supposed to be a 53 horse tractor, but it was getting sapped for power pulling a 9' haybine in first crop hay. Which brings me to the second problem, it was running 8/9 of the way up to hot on the coolant gauge, and the entire radiator is hot, so the inside doesn't seem plugged. The tractor required choke to run well after the engine got over 3/4 of the way to hot on the coolant gauge. This tractor has the external pump for the rear remotes and the loader. All filters are changed and fluid and bypasses in the filters are clean. Anyone have an idea?

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wolfman

06-15-2007 20:30:55




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 Re: 2500 or 574 help (long post) in reply to chadd, 06-15-2007 00:09:44  
Could the remote hydraulic lever be not returning to neutral position? This will put a load on it & kill it's power and make it labor... My 574 has the remote lever right where my leg can bump it off neutral position. Happened twice.



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caterpillar guy

06-15-2007 16:33:23




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 Re: 2500 or 574 help (long post) in reply to chadd, 06-15-2007 00:09:44  
Oh one more thing is the mower your using hydraulic or pto driven since the hydraulic system on the 574 is open center it will literally burn the hyd out by cooking all the o-rings in the tractor and create terrible heat if it's a hyd unit.you'll never have seen leaks till after that.Hoses will get hard and leak from brittleness in the rubber linings.



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caterpillar guy

06-15-2007 16:08:59




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 Re: 2500 or 574 help (long post) in reply to chadd, 06-15-2007 00:09:44  
THe radiator is still probably full of dirt try blowing it out with air. The pump you speak of is on the right side and was a factory option for those tractors for primarily industrial use but was available for the ag line also for just the purpose of running a loader and if you change it to run on the select control valves you'll be sorry for it on the loader operation slow as molasses (personal experience here) there should be a filter in the line for that external pump has that been changed. I do agree with the lean fuel running hot. Our 574 is diesel and is way to hot to set the seat for more than jus raking or loading. We tried using it for field work that ended fast the engine heat will run straight up on the gauge or just past on ours with the ambient temp your talking the grille will run it hotter if not kept brushed of regularly.

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Mike Van

06-15-2007 10:48:27




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 Re: 2500 or 574 help (long post) in reply to chadd, 06-15-2007 00:09:44  
I"d get rid of the cab in the summer, save a roof part if you need to for shade. If the 574 still has it"s own hydraulic system, the power steering is off those I imagine. That fluid goes through the lower part of the radiator to be cooled. If your external system is correct & all, you may need to add a cooler for that hyd. oil. Something really out of wack there, i"ve baled hay with mine when it"s been in the 90"s, I never had the engine run that hot.

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Janicholson

06-15-2007 07:06:33




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 Re: 2500 or 574 help (long post) in reply to chadd, 06-15-2007 00:09:44  
In addition to hueh's on target comments two items come to mind. The first is flow rating the hydraulics and checking to be sure it is not deadheading into a stuck, or misadjusted valve. The second is critical. If choking is needed, it is running too lean at the carb. this choking reduces the effective flow into the engine to about 60-70% (from the description you gave) . Further running lean will definitely cause excessive heat, in the engine and cab. Repair the fuel issue first as it can produce all the symptoms, and destroy the engine. JimN

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Hugh MacKay

06-15-2007 03:23:03




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 Re: 2500 or 574 help (long post) in reply to chadd, 06-15-2007 00:09:44  
chadd: Heat is one of the pitfalls of European built IH tractors, and indeed all utility type tractors designed so operator sits straddle transmission. Then you add a cab with lots of hydraulic plumbing inside. Gas engines also throw a lot more heat than diesel. The horizontal exhaust adds to this heat. All these factors add to your problem.

You also mention this external pump, is this something that has been added other than a factory pump? It could be you have a pump that is pumping to much volume for the system. That will add to heat and zap power as well.

I suspect this combination of items I've outlined is your problem. I'd first check the volume of that pump if not factory. Secondly, I'd try and remove as much of that hydraulic plumbing from the cab as possible. This can be done using cable controlled valves. Put that damn exhaust vertical. These aren't going to create miricles, but will help a bit.

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