Backhoe Cylinder

How to calculate required GPM for hydraulic pump?

Looking to get a PTO driven hydraulic pump to run a 3pt backhoe on my tractor. How do I go about figuring out what size I need. The backhoe has fairly large cylinders on it. They are may be 2x larger than the ones on the loader which runs off the internal system and it operates very slow. It seems that common pto pumps come in 11 or 21 GPM. That seems to be quite a spread so I would like to get the correct one the first time. The tractor is rated at 40hp so I should have plenty of power at any RPM.

You determine it by calculating the volume of your cylinders and hydraulic hoses. Then decide how many times per minute you want your oil circulated and cooled based on how hard you intend to work the hoe. The bigger pump will do the same work as smaller one, but not the other way around.

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1986853C1 Case Backhoe Stabilizer Cylinder 680E 680G 680H 680K 680L
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83971999 New Ford Backhoe Stabilizer Cylinder Seal Kit 555E 575E 655E 675E
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991 00110 JCB Backhoe Loader Boom Cylinder Seal Kit 214 505 19 FM 514E 8060 +
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AR105355 New John Deere 410 Backhoe Dipper Cylinder Seal Kit 310 310A 310B 655
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Whole Machine hydraulic cylinder kit for Ford 655A Backhoe
Whole Machine hydraulic cylinder kit for Ford 655A Backhoe
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Whole Machine hydraulic cylinder kit for Case 480C backhoe
Whole Machine hydraulic cylinder kit for Case 480C backhoe
$342.15
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John Deere 410 Late Backhoe Swing Cylinder Seal Kit AR105387 New
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$25.69
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Hydraulic Seal Kit for John Deere 410 Backhoe Boom Cylinder
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$76.23
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Hydraulic Seal Kit for John Deere 310E Backhoe Boom Cylinder
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$135.20
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Hydraulic Seal Kit for John Deere 310 Backhoe Swing Cylinder
$39.14
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Hydraulic Seal Kit for John Deere 210C Backhoe Boom Cylinder
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$110.00
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Hydraulic Seal Kit for Ford 755 Backhoe Swing Cylinder
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Hydraulic Seal Kit for Ford 555E Backhoe Stick Cylinder
Hydraulic Seal Kit for Ford 555E Backhoe Stick Cylinder
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Seal Kit for New Holland 555E Backhoe Boom Cylinder
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$119.99
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Seal Kit for New Holland 555E Backhoe Stick Cylinder
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Hydraulic Seal Kit for Case 480C Backhoe Boom Cylinder
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FD 85804740 Ford Backhoe Loader Bucket LH RH Cylinder Seal Kit 450C 555C +
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1543391C1 New Case Backhoe 580 Super K Boom Cylinder
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Hydraulic Bucket Cylinder Seal Kit John Deere 410 Loader Backhoe AR105429
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admin posted at 2011-6-19 Category: Heavy Equipment