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Farmall & IHC Tractors Discussion Forum
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300u Hydraulic worries...

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JayWalt

01-30-2007 11:03:31




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Let me paint the hydraulic picture for you guys. I have one IH valve hooked to the res on my 300u with no other blocks on it, just the vavle and cover plate, with 1 hose going to my loader lift cylinders. Now I also have another valve, but there is a block between the res and the valve and another block bolted to the bottom of the valve and is where the 2 hoses come out for the hitch. I was plowing snow today and i noticed that the engien seemed to be laboring, but if I use the hydraulics, either valve the engine seems not labored. I thought maybe the valves werent centering but the laboring goes away if i use either valve, actually moreso with the loader lift valve.
I'm assuming that because either of the vavles alleviates this problem its not in one of those added on blocks, am I right in the assumiption. The pump also seems to not whine like it normally does and the hydraulic fluid seemed awefully hot, not impossibly to touch the hardlines, but definitely toasty for being 15 degrees outside. Any ideas would be appreciated.

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Ted in NE

01-30-2007 13:36:17




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 Re: 300u Hydraulic worries... in reply to JayWalt, 01-30-2007 11:03:31  
The valves are factory from your description. You probably haven't changed anything, they can be set for single or double action. On the cover in the lever end is a round shaft with flats cut on it. Also has a roll pin through it into a clip. Cap has S & D stamped in it. Roll pin must be over letter or valve spool will not be centered & keep system on pressure when not useing valve. The larger block with the 4 bolts holding the cover on is the system relief valve. This valve has a orfice screen in it that can be plugged & cause the same problem. Need to remove the cover, screen is removed with a screw driver. Clean up also replace o ring on the unloading piston while have cover off. The cover has spring tension under it. Remove two bolts at opposite corners of cover & install longer ones to ease cover off & when installing also. The check block on the under side of the hitch valve would likely not cause the problem you describe.

Ted

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D Slater

01-30-2007 14:11:17




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 Re: 300u Hydraulic worries... in reply to Ted in NE, 01-30-2007 13:36:17  
Agree with ted, the screen or orfice may be pluged. If not check the regulator valve it lowers pressure in system when valves are in neutral position.



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JayWalt

01-30-2007 12:54:14




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 Re: 300u Hydraulic worries... in reply to JayWalt, 01-30-2007 11:03:31  
I did some checking on caseIH, and the block between the res and the vavle is a pressure safety regulator. Does this regulate pressure to just the vavle attatched to it or to both vavles? The block below the valve is a check valve. The parts seem to be basically oring based, but there is some mention of bushings and pistons/seats. I Know how both the regulator and the check valve operate, and dont think these are the culprit. I'm not sure how the valve sends a pressure signal, well moreso what exactly this signal does to initiate a flow. I would have thought it would just control mechanically where the oil is going whether it be to the cylinder or the resevoir. Am I safe to assume that replacing aged cracked orings should remedy any pressure signal leakage? Are these valves difficult to work on. The parts diagram should be enough to help me with re-assembly. Is there anything special I need to know. It would be IDEAL to know what size orings I'd need ahead of time, but It's doubtful there is any real info on this, so I'll probly have to match them up after disassembly, which makes for a longer process. Replaceing the "needles" and seat are probly not gonna happen.
Thanks Jim for any fuirther info you can give me!!

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JayWalt

01-30-2007 11:36:19




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 Re: 300u Hydraulic worries... in reply to JayWalt, 01-30-2007 11:03:31  
I dont think so, the way these vavles are setup, they bolt right to the resevoir and use orings to seal them, there almost no way to put them on wrong. The system usually works. About a month ago it did this and I worked the vavles a bit and it went away, today it wouldnt.



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Janicholson

01-30-2007 11:45:38




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 Re: 300u Hydraulic worries... in reply to JayWalt, 01-30-2007 11:36:19  
The valves are operated by a pressure demand signal from the third port in the valve. If the valve (any) is sending the pressure signal, the system will pressureize (as it is). this causes the deadheading as described in your post. It is not good. One of the valves is sending a wrong signal when it is centered. The diagram is important. Using a valve allows the pressure to be used, not deadheaded, thus the noise and laboring go away.. JimN

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JayWalt

01-30-2007 12:39:44




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 Re: 300u Hydraulic worries... in reply to Janicholson, 01-30-2007 11:45:38  
any ideas why it doesnt matter which valve I use? Now that I say that seems if one valve is deadheading the pump, then the other valve allows the pressure off the pump, it would alleviate it, just like using the culprit valve, which makes sense and would tell me why one has a better effect on it. Do they make rebuild kits for these valves and blocks?, or are they hopefully just orings which can be had locally. I have no problems with rebuilding them if I know I'm not gonna be spending several hundred dollars on rebuild kits. What are the other 2 blocks I described?
I have replaced the orings that seal them together and to the res a while ago, but havent taken the valves or blocks apart.

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TDK

01-30-2007 19:38:47




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 Re: 300u Hydraulic worries... in reply to JayWalt, 01-30-2007 12:39:44  
All the posts you've gotten is good advice, but I'd go with the regulator safety valve. For two reasons - 1) It's easy to remove the cover without removing the whole assembly from tractor. 2) It's the most likely culprit.
Safety valve could be sticking or, as previously mentioned, the orfice plug & screen may be plugged. At the least if this isn't the problem, then you can be sure it's in the valve(s). Send an email if I can be of help, been there - done that!

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JayWalt

01-31-2007 08:49:57




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 Re: 300u Hydraulic worries... in reply to TDK, 01-30-2007 19:38:47  
Since my main filter is toast (big hole in it), I'm sure the safety valve filter is clogged as well... Gonna do a thorugh clean job on this bugger!!



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Allan In NE

01-30-2007 11:31:25




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 Re: 300u Hydraulic worries... in reply to JayWalt, 01-30-2007 11:03:31  
Don't know how you are set up, but you aren't dead-heading an open center system, are ya?

That's really hard on things.

Allan



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