Release of Hydraulic Pressure: Kubota Review  -- Kubota Tractors Discussion Forum and Review Release of Hydraulic Pressure: Kubota Review -- Kubota Tractors Discussion Forum

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 08-18-2008, 18:32 Post: 156170
retcol



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 Release of Hydraulic Pressure

Does anyone have a foolproof way to release the pressure in hydraulic connections especially when the outside air temperature is high? I currently have an LA853 loader but I have exeprienced the same thing with my LA753 and also my Westendorf loader. I don't want to open up the connection to release the pressure. My other loaders had the female end on the tractor so I would push the tip against a tire, but with my cab it is reversed. Other times of the year I never have a problem. I always make sure I release the pressure before I disconnect the hoses.






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 08-18-2008, 18:47 Post: 156171
hardwood

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 Release of Hydraulic Pressure

Retcol; Being in a shed out of the sun helps a bunch, but even then I make an attempt to uncouple when the oil is hot from use and recouple early in the day when the oil is cool. That all sounds great, but it don't always happen that way so I usually just unscrew a coupler from the hose till it begins to seep a bit and in a couple seconds the pressure is gone. But for safety reasons always wrap a shop rag a couple times around it so that a sudden stream of high pressure oil can't penetrate the skin I know this isn't a recommended method or always a safe method but it is low cost and quick. When I had large farm impliments I would install a scheduel 120 "T" in the line with a high pressure steam ball valve to release the pressure. Frank.






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 08-19-2008, 09:33 Post: 156180
Murf



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 Release of Hydraulic Pressure

We have very few machines that the FEL comes off of very often so it's not a big problem. Our main issue is the zero tolerance for oil spillage.

What we did was make up a pair of short hoses with a ball valve between them and a coupler at each end. Two of these are connected as soon as the FEL is disconnected and left in place. To relieve pressure all you have to do is open the ball valve.

I've seen others reverse two of the couplers so that each line is one male, one female, then you just loop the hoses back together when you park the FEL. That seals the couplers too, keeps them cleaner.

Best of luck.






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 08-19-2008, 13:31 Post: 156186
harvey



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 Release of Hydraulic Pressure

Murf That is one heck of a good idea. The loop in the tractor circuit. How many times have I bumped the joy stick with my knee and deadheaded the hyd.

To relieve pressure I shove the nipple in and wiggle the joy stick. I don't recommend this. But it works for me.






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 08-19-2008, 22:23 Post: 156196
earthwrks

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 Release of Hydraulic Pressure

I have this problem when I run my skid steer a lot. All I do is shut off the machine and cycle the control levers (actually a foot pedal) a few times. Voila!






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 08-21-2008, 13:59 Post: 156217
8x56mn



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 Release of Hydraulic Pressure

Perhaps I'm missing something. If you lower the implament with the tractor shutt off and move the control valve all pressure is dumped, why are you finding it difficult to open the dissconnects? There should be no pressure on the hoses.






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 08-21-2008, 16:15 Post: 156220
harvey



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 Release of Hydraulic Pressure

When you unhook your loader you use hydraulics to lift the loader frame off the tractor. If you do this when the oil is cool in the am and go back in the afternoon when the sun has been on the hyd lines sometimes there is pressure.

I've had mine off for weeks at a time and no problem. Yet I've taken it off to service tractor and hour later could not rehook the boom hose.

The only common problem I've figured out is the sun hitting the loader.






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 08-21-2008, 18:38 Post: 156227
hardwood

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 Release of Hydraulic Pressure

8x56mn; In theory you are correct, all pressure released, there should be no problem to rehook the couplers. Now in the real world the thing you are missing is that after the loader is off perhaps the stands sink a bit into the soil putting a bit of pressure on the boom cylinders, the air temperature comes up, the sun shines on black hydraulic hoses, etc. Usually the temperature of the fluid in the loader cylinders, the hoses, fittings, etc. is the culprit. If you could always unhook the loader hoses when the oil is hot and rehook when it cools off baring any of the other factors I mentioned things would work fine. Now if you have never had a problem regardless of all the things I brought up you are indeed fortunate. OK now again in the real world that might indicate that you have some air in the cylinders or hoses that is easily compressable instead of 100% oil which will not compress. Enjoy your day. Frank.






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 08-22-2008, 07:11 Post: 156238
8x56mn



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 Release of Hydraulic Pressure

Yes I agree about the fluid heating, up , but again why not just wiggle the valve and let any build up go back to the tank, you know real world!Smile






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 08-22-2008, 09:15 Post: 156239
hardwood

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 Release of Hydraulic Pressure

8x56mn; I apologize for any misunderstanding we may have OK. But after the loader has been disconected from the tractor it doesn't matter how much you wiggled the lever to relieve the pressure before you disconected the hoses the pressure will still build up from the heat of the sun or just normal heat of the day in the loader cylinders, hoses, etc. Once you pull the couplers apart you have a sealed system in the loader circuts and cylinders, unless you have a leak the oil gets warm, expands, has no relief except to strech anything that contains it, the hoses mainly. I'd be curious to know just how much pressure buildup there really is in such a situation, likely someone has put a guage a the system to know that, I'd like to know myself. Frank.






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