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Subject: 8N Hydraulics,,,,,Again

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Charles (N.C.)    Posted 03-20-2017 at 13:35:43 [URL] [DELETE]        [Reply] [No Email]  
  • 8N Hydraulics,,,,,Again
  • Back on the 16th. I posted about my deliema with two 8N's that have to sit for long periods and the hydraulics now will not hold/work.Several have given help so I'll post where I'm at.Turned warm today so I put a load on one and went through the check list process.The ram piston pump was redone and neww piston and neoprene washer's.All checks well with no leaks under load but ????I have some oil movement at the lower hydraulic pump.I can see part movement and I believe the oil is just this.Now,,,,I have the lift up and holding for 1hr. now.Said a prayer also.As someone has said I put pressure in through the oil check.Can't believe the unit wasn't primed.I've never rebuilt a pump so,,,,maybe I'm safe.

    Charles (N.C.)    Posted 03-20-2017 at 21:52:31 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N Hydraulics,,,,,Again
  • Both the N's will hold a load up about 1 1/2 hr..One of these under load only shows oil movement circulating and the other shows some agitation movement.They both lift and hold some so I think I can live with this for now but no doubt the pumps need ????repair but I've never rebuilt a pump so I'll have to wait till I'm braver to attempt this.Having the pumps out and inspecting them I wouldn't know a bad part if it fell in my lap.Thanks fellas for your input.

    JMOR    Posted 03-20-2017 at 13:44:03 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N Hydraulics,,,,,Again
  • The scotch yoke mechanism will splash fluid & the rotation of the PTO shaft will swirl the fluid. see video.
    https://www.youtube.com/watch?v=fyXGC7wih2s

    R Geiger    Posted 03-20-2017 at 13:42:00 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N Hydraulics,,,,,Again
  • These pumps sit in oil so no priming is needed. If y ou want to check the output pressure of the pump, connect a pressure gauge to the test port on the bottom of the pump.

    If it is working, don't fix it.

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