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Loader Hydraulics Advice

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Colin (WI)

03-06-2000 21:22:21




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I bought a Jubilee with Paulson trip-bucket loader late last fall. Loader was not installed. Dragged everything home and put it together. Wasn't too impressed with loader's lifting capacity but lived with it. Weather's getting a little better and I've pulled it all off to see what I can do to improve performance. By the way, nothing seemed to leak much ( a little out of cylinders but no fluid dripping or spraying under load). Drained hydraulic oil I put in new in the fall. It's loaded with water (at least it's creamy light brown instead of clear as installed). I'm presuming cylinders were full of water when I put them on and I failed to notice. Took control apart and put back together. Looked clean and tight. Took Vickers Vane pump apart and put back together. Looked brand new inside. All vanes there and no signs of wear. Tried to take cylinders apart. Don't have the right tools to separate tube from head. However, no fluid pushes by seals (which were pretty loose)so I'm assuming they're ok. Cleaned them all up and forced all (almost) fluid out. Drained all hoses. I'm ready to put it back on and put new fluid in. There is no filter anywhere on this unit but I'd like to add one. It has an external tank mounted high on left ahead of operator. Bottom front of tank has a 1 1/2" port returning to pump. Is this the right place to put a filter or could this location starve the pump? Should it be on the pressure side between pump and control? One final question. Hose returning from tank to pump is currently a gas pump filler hose! Can I user a smaller hose the same as all the other hoses on the loader. This one's real big around and about 3' too long and I want to replace it. Sorry for the long post. Any advice will be appreciated.

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jdfred

03-07-2000 22:13:00




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 Re: Loader Hydraulics Advice in reply to Colin (WI), 03-06-2000 21:22:21  

the hose from the tank to the pump is a suction hose, not a return line. a gas pump hose may not be suitable for this since it may be collapsing internally and limiting the flow to the pump. I would replace this hose with a hyd suction hose of the same inside diameter. a low pressure return line could be installed between the valve bank and the tank and a strainer could be added in the suction line as the other posts have suggested. some other things you might check are relief valve pressure setting and have the pump flow/pressure tested by a hyd repair shop. even though the pump may look good, flow testing under pressure will tell the real story. hope this helps.

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Ed

03-06-2000 23:04:08




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 Re: Loader Hydraulics Advice in reply to Colin (WI), 03-06-2000 21:22:21  
Filter should be in the low pressure return line, never in the high presure lines. A strainer (screen) is sometimes used in the pump intake to keep any big chunks out of the pump.



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Tom(Pa)

03-07-2000 09:54:55




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 Re: Re: Loader Hydraulics Advice in reply to Ed, 03-06-2000 23:04:08  
being an aircraft mechanic and very intimate with hydraulic lines in tight spaces to boot, here is a piece of info. You will find that in systems with separate pressure and return lines the return line is always larger. The purpose is to ensure enough fluid at the inlet of the pump to prevent cavitation or starvation of the pump.(Thusly costing mucho megabucks.) Shorten the line to where there is no pull or stretching. Another thing is when reinstalling imagine a straight line down the hose and install the hose so that line does not twist around the hose. Helps keep from early failure due to stresses. Hope this helps. Tom (Pa)

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