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How fast/slow should the plow move when the truck is at idle? (under hood hyd)

Discussion in 'Fisher Engineering Discussion' started by Zack1978, Mar 3, 2006.

  1. Zack1978

    Zack1978 Member
    from NJ
    Messages: 82

    Hello everyone,
    I own a 1979 Toyota 4x4 short bed pick up, with a 6.5 Fisher plow. It has a underhood hyd system. The pump looks like a big coffee can. Well the basic question is how fast should the plow blade move when the truck is at idle? I just had the head gasket replaced and the also made some card adjustments, so poss the idle is slower now. If you rev the engine when you are operating the plow, if moves very fast, but at idle it is very slow. What is the deal? Is this normal? Any ideas? Do you think that because the idle speed might be a bit slower, it is making it move slower?

    Thank you,
  2. Mowerpan

    Mowerpan Senior Member
    Messages: 305

    That's pretty normal, to be much slower when idling as the pump isn't able to pump fluid fast enough. One way to overcome this is to get a different size pulley for your pump, but this will wear the pump out quicker.
  3. justme-

    justme- 2000 Club Member
    Messages: 2,138

    That's normal Zack. Slower engine rpm (idle) means less fluid moved per minute. Thats the way all hydraulic pumps work. You can change the pully to speed it up at idle but you will overspeed the pump at normal driving rpm's, especially highway use.