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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Freezing hydraulic valve?

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135 Fan

02-24-2007 21:38:11




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I have an unusual but not very serious problem with a hydraulic valve. I have a Cat 931B loader with a quick attach hoe on the back. Lately I have discovered that when it is cold the hydraulic valve for the stick will not move until the machine has warmed up for a while. The odd thing is that every other function will work right after the engine is started. It has a 2 lever system and the stick valve is with the swing valve which will work fine when cold. Has anyone else ever encountered this? It doesn't really make sense that the valve would freeze on only one function but that is how it is acting. Any insight would be appreciated as I don't think it did this last year. Thanks in advance. Dave

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Roy Suomi

02-25-2007 04:48:29




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 Re: Freezing hydraulic valve? in reply to 135 Fan, 02-24-2007 21:38:11  
Does the valve move OK with the engine off?? Or is it stiff then too..If it sticks then too , there might be a problem with the valve section or maybe some junk in the bottom spring cap for the valve spool. Rust acts in mysterious ways..Another thing , are the hoses hooked up right?? I've seen valves work strangely when the hoses were reversed..Oil would be flowing backwards thru the valve.. You might try something that I have done over the years..Take the linkage off the valve spool and turn the spool 180 degrees in it's valve section and hook the linkage back up and try it again..

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Bob

02-25-2007 19:37:59




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 Re: Freezing hydraulic valve? in reply to Roy Suomi, 02-25-2007 04:48:29  
EXACTLY. If there is a cap/cover/cage on one end of the spool with a spring and/or a detent inside, likely water has got in there, and "seizes" the valve as long as the water is frozen.

I saw this exact problem on a Deere loader valve a couple of winters ago. We cleaned it out, and sealed up the cover with a little silcone, and the problem has never come back.



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135 Fan

02-26-2007 18:25:39




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 Re: Freezing hydraulic valve? in reply to Bob, 02-25-2007 19:37:59  
Thanks to both Bobs for more info. When it warms up I'll take the covers off so I can get at the valve spool. I had the hoe off for the first time since I've had it last year. The pins were very hard to get out so I polished them a little so it's easier to remove the hoe. It's like a different machine with the hoe off. Better balanced and way faster. The hoe is nice if you get stuck though. Anyway I noticed that the quick couplers had grooves in the ring from where the balls hold them together. I get full hydraulic flow but I think I should change them. They were a little hard to take apart. Thanks again. Dave

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Bob/Ont

02-27-2007 08:10:12




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 Re: Freezing hydraulic valve? in reply to 135 Fan, 02-26-2007 18:25:39  
Dave, if they start giving you a problem the bucket tilt will work but the lift will not because the exh oil has to run through the power beyond circuit out to the hoe and back or through the coupled hoses with hoe off. This can be intermittant depending where the balls are in the groove. If they are in a worn spot they will not hold coupler together enough to unseat the check valves in the ends.
Later Bob

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135 Fan

02-27-2007 18:19:29




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 Re: Freezing hydraulic valve? in reply to Bob/Ont, 02-27-2007 08:10:12  
Thanks for the heads up. I though about changing them when I had the hoe off. I'll change them when the weather warms up. I need to go to a hydraulic shop because I think they are 1 inch quick couplers for the flow. They might even be bigger. 1/2 inch and 3/4 are more common so I'll have to look around. I'm afraid...very afraid to ask what Cat wants for them. Dave



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135 Fan

02-25-2007 09:08:10




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 Re: Freezing hydraulic valve? in reply to Roy Suomi, 02-25-2007 04:48:29  
Thanks for the reply. No, the valve won't move when off. All the others do. Everything is hooked up right and after the hydraulic fluid warms up a little it works fine. I could try turning the valve spool 180 but I don't think it's ever been apart. I could be wrong though. I guess I'll have to do some experimenting. Thanks again. Dave



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Bob/Ont

02-25-2007 19:15:39




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 Re: Freezing hydraulic valve? in reply to 135 Fan, 02-25-2007 09:08:10  
Sounds to me like the valve body is warped. If all spools are in a bunch of sections held together with long studs try slacking off the nuts a turn and see what happens. Then pull out that spool and see if it has any big marks on it that could be polished off. Another thing make sure the quick couplers are in good shape, not worn in the groove where balls lock it together or the entire system might not work. If coupler not together tight the oil will not go through.
Later Bob

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