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    4520 compact tractor engine surges when put in forward or reverse

    Engine surging up and down like governor kicking in and out. when put in gear forward or reverse. also when operating loader. when increasing rpm surges for a couple minutes then stops and becomes stable. I have replaced fuel lines, filter, air filters. transfer pump,cleaned tank and screen...
  2. C

    JD 4520 compact tractor [2004] engine surges

    Engine surges like fuel starving momentarily then comes back and repeats. this happens at all speeds. any time under load is worse. I've replace filters, fuel and trans. It's a power reverser. replaced fuel lines, cleaned fuel tank, replaced the transfer pump, air filters. 1800 hrs on...
  3. C

    new member

    just saying hi

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