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Subject: 8N-C hydraulic pump driven from front

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Chris Zuhn    Posted 05-16-2019 at 22:09:33 [URL] [DELETE]        [Reply] [Email]  
  • 8N-C hydraulic pump driven from front
  • Can a hydraulic pump be driven off the front of the crankshaft? If so, what horsepower pump can be driven (pressure and/or flow rate)? My 8N has no grille - long gone. I have no plans, at this point, to replace it. zuhnc

    TheOldHokie    Posted 05-17-2019 at 05:31:50 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N-C hydraulic pump driven from front
  • Crankshaft driven gear pump is common and relatively inexpensive solution. You have 25HP which will get you 10-15 GPM @ 2000 PSI. For intenive applications like a constant load hydraulic motor the reservoir size is likely the constraining factor. To really answer the question you need some idea of the duty cycle. What size reservoir do you need and where are you going to put it? In other words what are you going to power with the pump?

    TOH

    Chris Zuhn    Posted 05-20-2019 at 18:50:29 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N-C hydraulic pump driven from front
  • Thanks for the information. I have a pump I took off my (now scrapped) 4.236 Perkins. Splined shaft, but I don't know the specs, offhand. Used it with a pressure relief valve to operate the power steering on the 1980 Ford F150. Possibly a back hoe, and am considering running the brush cutter via hydraulics instead of the PTO. Both of these projects are in the middle future, however. The engine-mounted pump will give me "live" hydraulics, and still be able to use the 3-point hydraulics independently. Trying to not re-invent the wheel; your information has pointed me in the right direction. Thanks. zuhnc

    TheOldHokie    Posted 05-20-2019 at 19:47:25 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N-C hydraulic pump driven from front
  • If you are thinking live hydraulics on the 3pt keeping mind the max you can dump into the test port is a scant 3 GPM. Anything more will exceed the flow capacity of the exhaust valve and play havoc with lift control.

    TOH

    Chris Zuhn    Posted 05-20-2019 at 22:28:29 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N-C hydraulic pump driven from front
  • No, two separate systems. Existing tractor hydraulics for the 3-point, and the engine-driven pump for "accessories". I.e., keeping the brush cutter running at the proper speed when backing into spaces that can't be cut driving into. Of course, all safety procedures must be adhered to when dismounting from the tractor seat: shut off mower, PTO, turn off engine, wait for stuff to stop, then step down. zuhnc

    TheOldHokie    Posted 05-21-2019 at 04:26:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N-C hydraulic pump driven from front
  • Dual systems are a common setup used with loaders. Adding remotes to it for powering a hydraulic mower pretty straight forward but hydraulic motors are a substantial heat load so size your reservoir accordingly.

    TOH

    Chris Zuhn    Posted 05-27-2019 at 00:06:28 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N-C hydraulic pump driven from front
  • Thanks for the information. As stated, a middle-future project. Have to get the Bush Hog (tm) operational first. It was really beat up. I have been perusing all the posts on this and other forums about live hydraulics and external hydraulic pumps, specifically for the 8N. All quite interesting and food for thought. zuhnc

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