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  1. #1
    New Member
    Join Date
    Sep 2009
    Southern Ohio
    1984 John Deere 2750, 1976 JD 2240, 1951 Ford 8N, 1955 Ford 650

    Default Need Help with a Pressure Test on a JD 2750 Main Hydraulic Pump!!!

    I am trying to run a pressure test on the main hydraulic pump on a JD 2750. Have I circled the appropriate place (in the picture) to attach the pressure gauge?


    Incidently, I am trying to isolate why the tractor suddenly lost pressure at on the 3 point and remote outlets. I rebuilt the rockshaft around 100 hours ago, including new fluid, filter and screen cleaning. It has worked great until recently I shut it off after mowing pasture all day. About an hour later, I restarted the tractor and had virtually no lift from either the rockshaft or remote outlets. The remote output pressure is varying between 1,000 and 1,500 psi, so I am wondering whether there may be a piece of debris stuck in the priority valve. I have already tried backing the stroke control valve out then retightening, but that made no difference. I plan to pressure test the main pump prior to taking the prioirty valve out. Any advice will be appreciated!!
    Last edited by BuckeyeFarmer1994; 09-18-2012 at 12:07 PM.

  2. #2
    Elite Member Zebrafive's Avatar
    Join Date
    Aug 2010
    South West MI
    John Deere 2030, John Deere 6415

    Default Re: Need Help with a Pressure Test on a JD 2750 Main Hydraulic Pump!!!

    I would say no that is the non adjustable stroke control valve. You might have backed off the pump shutoff valve, not the stroke control valve.

    I would check the priority valve.

    Is there a tee up stream from the priority valve going to the steering? That might be the place to pressure test the main pump.
    John Deere 2030 JD 245SL Loader
    John Deere 6415 mfwd JD 640SL Loader

  3. #3
    Platinum Member
    Join Date
    Oct 2010

    Default Re: Need Help with a Pressure Test on a JD 2750 Main Hydraulic Pump!!!

    The only way to test the pump properly that I know of is to connect into the main pressure line with the flowmeter before anything, valves, flowdivider etc. If you go after any valving you also have that to contend with when trying to figure out what's wrong.....Mike

  4. #4
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Need Help with a Pressure Test on a JD 2750 Main Hydraulic Pump!!!

    You should be able to connect the gage at the input to any valve, and activate the valve and retract a cyl until the relief kicks in. John Deere 2750 tractor information

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  5. #5
    Gold Member
    Join Date
    Nov 2011
    Canton, TX
    JD 301A and yanmar YM2500


    Locate the hyd output line/lines on the pump. There should be a little bolt on top of 1 which is the test port. There is also a port for testing the stroke pressure. For my pump the stroke pressure test port was on the mounting end of the pump on top. Otherwise the priority valve can at least give you an idea of where the issue is. Sounds like a seal is leaking and bypassing fluid, your main pump is bad, or the oc feeder pump went out.

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