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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

jd450 hissing hot hydraulic fluid...why?

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John

12-31-2003 16:56:52




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My loader is suddenly really heating up the hydraulic fluid with the tank so hot it will burn you in a few minutes just sitting. The bucket still lifts and rolls but it seems that I hear a hissing through the bucket control valves. Could someone give me some help on this? I urgently need to use this machine.




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JD-Tractor

01-01-2004 12:10:38




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 Re: jd450 hissing hot hydraulic fluid...why? in reply to John , 12-31-2003 16:56:52  
Possibly relief valve stuck PART Way open or needs adjust.Check it before anything!!!



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jdemaris

01-01-2004 18:22:48




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 Re: Re: jd450 hissing hot hydraulic fluid...why? in reply to JD-Tractor, 01-01-2004 12:10:38  
The guy with the problem says it happens with the control valve in neutral position. On the 450 with open-center hydrualics, there is no relief valve in the circuit unless a function is actually being used.



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Bob/Ont

01-01-2004 10:10:53




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 Re: jd450 hissing hot hydraulic fluid...why? in reply to John , 12-31-2003 16:56:52  
John. your loader isn't set up with Power Beyond is it? That means lines off the main valve to a Back Hoe valve that is detachable, or some other devise. If it is, check any Quick Couplers the oil has to go through. If they get worn in the locking groove or a spring in them breaks or comes loose they will not open enough and cause a problem like you have. This can be an intermittent problem if it's the worn groove, depending where the lock balls sit. Later Bob

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Brokenwrench

01-01-2004 04:52:43




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 Re: jd450 hissing hot hydraulic fluid...why? in reply to John , 12-31-2003 16:56:52  
You may have an internal leak in the control valve, this would cause the oil to heat up and give you the hissng sound you are hearing. Start the tractor cold and let it run for a few minutes without using any hydraulic functions. See if the control valve is hot to the touch. If it is, the valve is bypassing internally,or is sticking,holding a spool partially open causing your oil to heat.



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jdemaris

12-31-2003 18:02:19




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 Re: jd450 hissing hot hydraulic fluid...why? in reply to John , 12-31-2003 16:56:52  
It shouldn't be heating up when the hydraulic functions aren't being used unless there's a restriction in the hydraulic loop. JD 450 crawler-loader system is a follows: First, there is a suction hydraulic filter down inside the tank, under the oil where you can't see it. Oil is sucked through that filter and travels to the pump. From there, it exits the pump and goes through the hydraulic control valve, and then through the return filter that is in the top of the hydraulic tank. So, most obvious thing is to check the two filters. On top of the hydraulic tank is a return filter restriction indicator. It's a little pin that jumps when the filter is restricted. Is it jumping up and down? To service the filters, remove the top-cover off the hydraulic tank by removing the 3/8" bolts, then pull it up and off. A long, throw-away type hydraulic filter should be bolted to the cover with a long bolt. Sometimes it's fallen off and down in the tank. The other filter is metal, and can be cleaned and reused. It's sits on the bottom of the tank and is held in by a spring-loader retainer. So, you either reach under the oil, find it, and pull it out - or if you don't like fishing around in the oil, drain the tank first. Now, if you have oil heating problems that only occur when you are actually using the hydraulic system, that's a whole different story.

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John

12-31-2003 18:55:33




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 Re: Re: jd450 hissing hot hydraulic fluid...why? in reply to jdemaris, 12-31-2003 18:02:19  
Thanks for now Mr, jdemaris. I was hoping you would respond. I read this forum almost daily and I can't tell you how much we learn from your responses. I will go back to the loader tomorrow, clean those filters you explained and look forf the popup pin you mentioned. It is getting hot even without operating the bucket. But there is a definite hissing of fluid through the ncontrol valve bank as if you were holding one of them about n halfn open. I hope I can get back to you tomorrow after cleaning the filters if we can't find the problem. My older brother is a retired truck mechanic/diesels so he is more competent than I but of course that didn't demand much in hydraulics. I will get back to you tomorrow or as soon as I can. Thanks again, John

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jdemaris

01-01-2004 06:18:30




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 Re: Re: Re: jd450 hissing hot hydraulic fluid...wh in reply to John, 12-31-2003 18:55:33  
The hydraulic control valve on the 450 is pretty straight-forward and simple. If you're getting unusual noise from it when in a neutral position, either you're hearing noises from oil surging, or something mechanical is broken in the valve. Normally, in neutral (hands off all controls) position, oil simply flows through the valve unobstructed. So, if the valve is causing the noise, then there is some sort of obstruction. Try jiggling the controls and see that all feels normal. Each valve spool has springs on it, so it will return to a neutral position when you let go of it. If a spring breaks, the valve spool will just flop around, and perhaps, not sit in a true neutral position. Kind of hard to tell from here - but if it feels as though the spring-function isn't working, you can pull the end caps off the end of the valves and check the springs. They should all be pretty much the same except for the valve spool that has a "lock in float" position. Another possibility is some debris traveled though the sytem and got stuck in the valve. That's common, escpecially if you found our that your return oil filter fell off. If a piece of packing blows out in one of the cylinders, it runs through the system. That filter, the one that comes off will the top cover on the hydraulic tank, is held on by a long bolt. On the inside of the filter, is a long spacer - which permits you to tighten the bolt without crushing the filter. Quite often, the spacer has been lost, and the filter installed with JUST the bolt - which now can't be tightened very much, and soon the bolt and filter just falls off into the reservoir.

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