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JD 45 loader plumbing ?

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JD JACK

12-29-2002 17:22:45




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I bought a 45 loader this summer, has hydraulic bucket also. I just replaced some hoses.
Backed tractor up to it, hooked up hoses. One lift ram is faster than the other. Hose from control unit goes down to the left side ram rear and is Tee'd there, and goes to the right side ram. Front hoses are spliced about equal distance apart. It was routed this way when I got it. Should it be tee'd in half way between both rams, front and rear? The way it is right now it acted like it fills the left ram first, and comes to it's end of travel point and then right side ram will work faster.(loader is on stands on ground). If anybody has any schematics please e-mail them to me. Will it make a difference if it is tee'd at one ram and runs to the other, or should all rams be tee'd equal distance appart? Thanks JD JACK

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andy

12-29-2002 20:05:55




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 Re: JD 45 loader plumbing ? in reply to JD JACK, 12-29-2002 17:22:45  
I have a John Deere 45 I use regularly. My guess would be that since your loader is on the stands and the cylinders are only moving the back part of the loader "in and out" it fills one first and then the second cylinder. Put it on the tractor and make it lift the loader and I think your problems will be solved. All of these loaders use a tee. Does not matter where the tee is. I think I have noticed on occasion one side wanting to lift first ... but most of the time it works just fine. Good luck. andy

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Clooney

12-29-2002 17:42:53




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 Re: JD 45 loader plumbing ? in reply to JD JACK, 12-29-2002 17:22:45  
Jack, it makes no difference where the tees are at, once the system is full of fluid it will have the same pressure in all legs. It sounds like you have air in the system now.



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F-I-T

12-29-2002 18:44:52




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 Re: Re: JD 45 loader plumbing ? in reply to Clooney, 12-29-2002 17:42:53  
I have a 45W loader with hydraulic bucket, and it is plumbed the same as Jack's. The left arm on mine does lift faster than (or rather ahead of) the right arm, and I thought it was air. I've been using it daily in the woods, and have cycled it at least 500, if not 1000 times, and the left still lifts ahead of the right, though I agree Clooney, once the air is out, the pressure is the same in both legs (just like hydralic brakes).

Of course, if you put a load on it they come right together, but I have not been able to explain it to myself, so I'm also interested in why this loader seems to defy the laws of physics.

Frank-in-Tallahassee

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CJDave

12-30-2002 06:33:26




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 Re: Re: Re: JD 45 loader plumbing ? in reply to F-I-T, 12-29-2002 18:44:52  
Actually, the only time absolutely equal pressure is delivered to both cylinders is when the flow is infintessimally slow (or at zero) and the friction losses in the hoses are near (or at) zero. No matter what, physics dictates that there IS friction loss in the hose. So when no load is present, the friction loss becomes a significant portion of the overall operating pressure head and WILL noticeably subtract from the flow to the RH cylinder. When you need 1300 PSI to lift the loader and the friction loss is ten pounds, it is insignificant. When you only need 300 PSI and the friction loss has now jumped to 13 pounds due to the frisky pump delivery at that low head, you can all of a sudden "see" the difference. 13 means a heck of a lot more to 300 than 10 means to 1300. No load means the FLOW will be HIGH since even a worn out pump can move a lot of oil against low head, and THAT is when the friction losses will be the highest. It's no big mystery; and it isn't hard on the loader frame or arms since there is,....well....no load.

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F-I-T

12-30-2002 06:38:57




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 Re: Re: Re: Re: JD 45 loader plumbing ? in reply to CJDave, 12-30-2002 06:33:26  
CJDave:

Cool !

F-I-T



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