Info on 300 Utility Hydraulic System

ChrisNH · Oct 24, 2010

Just had the hydraulic pump completely restored at a very good hydraulic repair shop, put her on and after about 30 seconds, the NEW seals blew. Took it back, along with the control valve blocks and the block that has the power steering priority valve, regulator and safety relief valve in it. They hooked it up to a test rig but said the pump is seeing 1500 psi all the time - obviously an issue - they think because without a hydraulic system schematic they aren't sure exactly what the spec is.

I'm now quite stuck, and sinking money into this thing way too quickly. Where can I get a schematic (i.e. which book is it in?). Does anyone know what the idle pressure on the pump should be? Would you think this is a problem with the regulator? They went through the control valves to ensure they are returning to neutral after moving.

Thanks in advance guys, I need help on this one.

CNKS · Oct 24, 2010

The pump is in front of the distributer? Basically, those pumps cannot be restored if the metal parts are excessively worn. All you can replace is seals -- unless they were somehow able to build it up and machine to the correct specs. Someone will correct me if I'm wrong.

Rumplestiltskin · Oct 24, 2010

Hi, Chris.

The manual I have is the IH Blue Ribbon Service Manual "Hydra-touch 300 and 400 Series," Form GSS-1062. The images in the manual seem to be more for the Farmall series than the International Utility series, but the designs are probably similar. There is a nice schematic on the inside of the rear cover.

I'm pretty sure I bought the manual from Binder Books.

Mark W. in MI

ChrisNH · Oct 24, 2010

Yes, its a machine shop and they did reface everything and had the pump running find on a test rig - it's not the pump or the seals I'm worried about. I'm trying to find a copy of the hydraulic schematic and if anyone knows for sure what the non-working pressure on the pump is. I'm pretty sure this is a regulator issue, but we're kind of stuck. Does anyone know what TA manuals cover exactly how to test the hydra-touch regulator/power steering priority block?

ChrisNH · Oct 24, 2010

Great! Many thanks Mark! Does that manual cover the utility? Does it have procedures for checking out the hydraulic pressure regulator, etc?

Rumplestiltskin · Oct 24, 2010

It doesn't specefically mention the Utility, but when I ordered the manual they knew I had a 300 Utility, so this may be the closest thing available.

There's no one place where it says, "this is how to test the regulator," but there is a ten-step test procedure that covers about three pages. The procedure tests the whole system (including the regulator, of course), and it mentions regulator-related symptoms.

The manual states that the hydraulic components must be installed on the tractor for this testing, but if you're working with a hydraulic shop and can show them the schematic they may be able to assemble the system in the shop for testing.

Mark W. in MI

ChrisNH · Oct 24, 2010

Excellent. I've seen that manual on ebay but they weren't answering the questions I posed to them. Based on your info, I'm happy to buy it now. Take care and thanks again Mark. I hope I can get this thing moving again soon!

Chris

Cub149 · Oct 24, 2010

I think there should be 35-95 psi with controls in neutral. There is a filter screen in the regulator that get plugged and causes the system to go to full pressure. You should be able to see it in he parts diagrams at caseih.com.

PaulW_NJ · Oct 24, 2010

There are a series of Blue Ribbon Service Manuals that pertain to hydraulics that I found helpful in rebuilding the valves and power steering on my 240 and 340 Utilities. They are

GSS-1278 Hydraulics: Valves and Systems
GSS-1280 Hydraulics: Troubleshooting
GSS-1279 Hydraulics: Pumps
GSS-1284 Hydraulics: Cylinders

I know the Troubleshooting one has specs on the 300; don"t know for sure if the 300 had same hydraulics valves as those of 240, 340 etc for which valve rebuilding is detailed in 1278.

I"ve seen all of these on ebay from time to time.

PaulW_NJ · Oct 24, 2010

This is perhaps the best "textbook" I've found on understanding how these IH hydraulics work. It's about a 460, but the components and concepts are the same. Well worth your time to study it.
IH Hydraulics

ChrisNH · Oct 25, 2010

Thanks Paul. I would have never guessed that these manuals would apply to the 300U being that they were printed 5 years after my tractor was built. But I'm getting the impression there are little tidbits of info here and there and not necessarily a single book. I'll pick some of these up and see if that helps,

Chris

ChrisNH · Oct 25, 2010

Paul,

I think this link you sent may have the answer to my problems: "Based on the above self-hypothesis, I concluded that the collapsing of the orifice screen occurred the instant the new hydraulic pump found its prime and began moving oil. The screen and orifice were so dirty (some big surprise there!) that no oil could pass to the regulator piston side of things to equalize pressure on both sides of the screen. Now that we had a pump capable of thousands of pounds of pressure, the screen smooshed in on itself. I am very curious as to how long that 1/2 cup of water rested in the regulator valve cavity and how it got there."

That's a good place to start.... Again, many thanks.

Chris

Rumplestiltskin · Oct 26, 2010

You're welcome, Chris. It won't be an exact match, but it'll be a ton better than nothing.

Mark W. in MI

Info on 300 Utility Hydraulic System

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