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super c hydraulic problems

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farmall 66

07-06-2007 06:51:42




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the hydraulisc on my super c was rebuilt and it works but the system is getting hot and no matter where the levers are the pressure still has the engine under load .which is probley why it is getting hot.any ideas THANKS




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Cedric

07-07-2007 04:14:02




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 Re: super c hydraulic problems in reply to farmall 66, 07-06-2007 06:51:42  
If the engine is under load with the levers in any position the problem lies with the pressure regulator valve.
Either the regulator valve piston and its seal ring are stuck in the block bore, or the orifice plug is stopped up with foreign matter, making the regulator inoperative. You will need to remove the regulator piston and orifice plug and check them out. The hole in the orifice plug is small and can easily be blocked.
The Blue Ribbon Serviceman's Handbook GSS-1024 is a handy book to have when working around these units. Sid.

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georgeky

07-06-2007 08:08:04




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 Re: super c hydraulic problems in reply to farmall 66, 07-06-2007 06:51:42  
I think Jim is on the right track. If you look on the sides of your hydraulic unit you will see some Allen head bolts that look like plugs. These are for adjusting the stop clips. When they are not exactly right they allow the unit to keep trying to pull oil, which keeps the pump loaded as you mentioned. It may even be whining a little. If not adjusted properly it will cause system failure. A I&T manual has the adjustment procedure in it. This does need to be done by the book. Good luck.

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FARMALL66

07-06-2007 08:13:55




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 Re: super c hydraulic problems in reply to georgeky, 07-06-2007 08:08:04  
IS THAT WHERE THE RELIEF VAVLES ARE .ITIS PUNPING ALL TIME NO MATTER WHERE LEVER POSITION IS.



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georgeky

07-06-2007 08:24:56




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 Re: super c hydraulic problems in reply to FARMALL66, 07-06-2007 08:13:55  
I reread your post and if it is pumping no matter where the levers are it may indeed be the relief valve instead of the stop clips. In may also be a plugged orifice or internal pipe plugs that are loose or missing or need cleaning out. The stop clips would only load the pump with levers at either end of their stroke.



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FARMALL 66

07-06-2007 08:29:27




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 Re: super c hydraulic problems in reply to georgeky, 07-06-2007 08:24:56  
WHERE ARE THE RELIEF VAVES.MY PARTS BOOK IS NOT TO CLEAR



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georgeky

07-06-2007 08:45:58




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 Re: super c hydraulic problems in reply to FARMALL 66, 07-06-2007 08:29:27  
I think it is actually called a pressure regulator valve. It is in the lower hole of the unit after remaoving the cylinder head you can see it. There is also a relief valve, that goes under the unit. So it will have to be off the tractor to get to it. I would check the regulator valve and the orifice plug which is to the right of the regulator valve. It has a screen in it that may be plugged.



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Janicholson

07-06-2007 07:19:51




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 Re: super c hydraulic problems in reply to farmall 66, 07-06-2007 06:51:42  
If one of the position sensors in the system is off a little, the pressure trys to make the cylinder go beyond its limits, keeping the pump working. Every setting in the book, and position of spacers Etc. is critical. Go by the layout in the parts book, and the description in the repair manual. If someone else did the rebuild, it will fall to them to make it correct. JimN



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the tractor vet

07-06-2007 07:17:38




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 Re: super c hydraulic problems in reply to farmall 66, 07-06-2007 06:51:42  
You probably have the control valve sticking or the pressure relief valve sticking and it is not comming off high pressure when it reaches desired hight . With out getting into it myself and going thru everything it is hard to just say here is your problem . Ya may have a small burrs on the valve and it is not sliding free or a cut o/ring a tinny pice of dirt or lint from a rag . When one is working on hyd's you never wipe anything with a rag . Clean parts in a suitable solvent used compressed air to blow dry . Also having a good clean metal work surface and clean paper to lay parts on to let air dry . When getting ready to install blow that part off and dip in clean hyd. fluid and install. Also if you are like me and the old eyes don't see well anymore good lighting and a magnfing glass to inspect everything and dry hand fitting of all valves and spools is a must . Use crocus clothe to lightly polish valves and spools checking for burrs and scratches the best ya can on the out sides of valves and spools and in the bores them selfs.

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FARMALL66

07-06-2007 07:53:02




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 Re: super c hydraulic problems in reply to the tractor vet, 07-06-2007 07:17:38  
WHERE ARE THE PRESSURE RELIEF VAVLES AT . I TOOK THE UNIT APART FOUND NOTHING THAT LOOKED WRONG ALL ORINGS LOOKED GOOD AND WHERE INSTALLED CORRECTLY PER PARTS MANUAL . I DONT HAVE A GOOD MANUAL.



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A. Bohemain

07-06-2007 08:15:01




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 Inconvenient Truths in reply to FARMALL66, 07-06-2007 07:53:02  
The hydraulic system on Farmall tractors was never intended to be consumer serviceable. Working on the hydraulic system requires standards of cleanliness and precision which are outside the normal conditions of many shops.

My own grandfather, who was a certified Deisel mechanic, and used to routinely machine his own parts for the bulldozers, dragline, etc. in his earth moving business, would drive the tractors into his shop in town to work on the hydraulics, as he simply couldn't keep things clean enough in any of the barns on either farm.

In any event, it is difficult to conceive of someone undertaking the job without either EXTENSIVE experience with these things, or at least TWO manuals. The IT IH-8 manual contains much of the information you need. But you should also read the sections of the Owner's Manual (you can get one from your Case dealer) that deal with the operation and lubrication of the Touch Control system.

In any event, as the subject line implies, none of this is difficult, it just requires a little thought and effort. With a clean space, the correct tools and techniques, manuals, and a good working relationship with the man on the other side of the parts counter, many people without formal training have fixed agricultural hydraulic systems. Some may be quick to tell you you don't need some or all of these things; but each one GREATLY increases the chance of an inexperienced mechanic SUCCESSFULLY undertaking repair of such a complex and unusual system.

Me? I've never had a major hydraulic problem, but if I did, I'd drive straight to our local Case dealer, who does a good job supporting these older tractors.

Good luck. Keep us posted.

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mark

07-06-2007 09:03:26




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 Re: Inconvenient Truths in reply to A. Bohemain, 07-06-2007 08:15:01  
Well, let me toss a morsel in the pot and give you my 2 cents worth.

I'm not the sharpest knife in the drawer, but over the past 50 years of life, I've managed to pick up on a few things:)!

I rebuilt the hyd. reservoir on my SA and I think the SC has the same unit....or very, very similar.

It does not require a brain surgeon or an extensive shop. In fact, I found it to be dirt simple and a straight forward repair. Yes, be clean...and then use a dose of horse sense (follow instructions).

I took my unit off the tractor, lugged it over to the bench and started CLEANING the exterior first. When I had it crud free, I cleaned the bench. I laid down a sheet of cardboard, got my book out and started turning bolts.

Now, I was out to fix leaks. The unit worked fine otherwise. Therefore, I didn't mess with the stop positions you mention (if it ain't broke, don't fix it). When all the guts were out and identified and laid out in the order they were removed, I looked them over real close and then looked at them again. The spools go in, in reverse from one side to the other.....hmmm. Makes sense...one is for up, one is for down. I replaced all the O rings, cleaned the innards with carb cleaner...got it squeaky clean and blowed it out. I put ATF on the spools and shoved them back in place. The heads were reset and so forth and when all was back together, I shot new paint to it. Damn thing looked like it came from a first class shop when I was done. I remounted the unit, hooked everything up good and proper and filled the system with ATF. It has worked perfectly ever since. No leaks, no hums....just up and down on demand. Somewhere along the way to grandma's house, you installed something wrong or let crud plug something up. I fear the former more than the latter. Take it apart again and really pay attention to how everything comes apart....make sure the spools come out/went back in the right way.....you can put them in reversed. They are just pistons, but if they don't pass the intake or relief ports correctly, the fluid doesn't flow right. Be patient and take your time...you'll fix it, I'm sure.

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georgeky

07-06-2007 08:55:43




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 Re: Inconvenient Truths in reply to A. Bohemain, 07-06-2007 08:15:01  
These units can be and are overhauled on many farms by farmers. They are not real complicated. With a good manual and patience almost anyone with any mechanical ability can service them.



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