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Extreme V Pump Pressure

Discussion in 'Fisher Engineering Discussion' started by gtmustang00, Aug 11, 2014.

  1. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    What should the pressure be? Plow lifts very slow in scoop and I checked the quill adjustment. That didn't change anything and I suspect it's a weak pump.
     
  2. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,705

    2250psi, How are connections? How good is battery? Remember it is more difficult to lift plow in scoop.
     
  3. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    I called Donovans and they told me 3200 psi and it spikes over 4000. It should lift the same in all positions they said.
     
  4. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,705

    That sounds like the base end relief pressures.
     
  5. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    I'm going to buy a gauge now and I'll unhook the lift cylinder hose and hook the gauge up.
     
  6. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,705

    Base end relief 4600psi
    Rod end relief 3700psi
    Pump relief 2250psi


    It will be a touch slowly lifting in scoop. Weight is further out making the plow heavier for the pump.
     
  7. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    1700-1800 psi is what I get on the gauge. Which adjustment is for the pressure?
     
    Last edited: Aug 11, 2014
  8. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,705

    Under rear cover, lower passenger side of block.
     
  9. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    Pressure is now at 2300ish psi and still lifts slow as **** in scoop mode. Way faster in retract and straight.
     
  10. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    [​IMG]

    Here's a video. Any other suggestions?
     
  11. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,705

    Sounds like motor is really slowing down therefor I suggest checking battery or charging system and plow motor may be getting tired.
     
  12. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    Hmm. I have moved other plows with no issues. Would a valve or cartridge cause this? My buddies who have the same plow both said theirs are def. faster.
     
  13. 1olddogtwo

    1olddogtwo PlowSite Fanatic
    Messages: 11,552

    Need to check with AMP meter to check draw. Chances are the motor is cooked.

    Motor a 100 bucks, down time in middle of event, priceless.

    On edit, the video just played. Wing speed looked good, I would lube up the hinge pins of the push beam, sounded loud,dry and rusty..

    Lifting takes all the power.
     
    Last edited: Aug 11, 2014
  14. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    From the positive motor stud to the relay?
     
  15. 1olddogtwo

    1olddogtwo PlowSite Fanatic
    Messages: 11,552

    Yes, it should pull about 160 to 180 if I remember right.
     
  16. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    Maximum Motor Amp Draw =
    250 Amps over relief at 2250 psi

    That's what I just read in the Fisher library.
     
  17. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,005

    The lower number the better
     
  18. gtmustang00

    gtmustang00 Senior Member
    from Berlin
    Messages: 748

    Ok So in V mode the highest the amperage got to was 170 til it max'd out then went up to the 200's. In scoop mode it went up to 230ish while still lifting slowly. There's going to be more strain on the motor since the plow is in scoop mode, more weight further out to lift so it's going to take more juice, no?
     
  19. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,005

    Correct. But as others have said its making a funny noise you need to look into
     
  20. cwren2472

    cwren2472 Member
    Messages: 59

    Have you checked the filter inside the reservoir to see if its blocked? That will cause it to run slow even if the pressure is normal.