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  1. K

    Fuel Shut off Solenoid - Delphi pump

    Talked to a diesel repair specialist shop who said he had a truck on which the owner replaced the hood latch with an aftermarket latch. The original latch had an electrical connection but the replacement did not. Turns out the latch told the computer when the hood was open or closed and the...
  2. K

    Fuel Shut off Solenoid - Delphi pump

    My tractor after about 2,000 hours suddenly stopped running and would not restart. Checking the fuel system, I had fuel going to the injector pump, but no pump output at the injectors. I called to order a new shut off solenoid from the dealer and was quoted the unit at over $200 including...
  3. K

    Challenger MT455 Fuel supply problem

    I have owned this machine since new. One day recently it simply would not start, so I started looking for the problem. I opened the injector connections and none were delivering fuel. When I operated the fuel lift pump manually, it was delivering fuel mixed with air. Considering the age of...
  4. K

    JD 490E Test Harness Problem

    Yesterday I tried to set the DP sensor and angle sensor on my 490E. I could not get a reasonable reading on either of them and they are both new. I kept getting very low voltage readings on both while using my JD test harness and multimeter, so I gave up and just moved it under limp mode...
  5. K

    Challenger MT 455 proposed electronic lift control Modification

    Cliff, I sincerely appreciate your reply. The factory installed system has been a constant pain, so I am perfectly fine with just an up-down switch. When you said solenoids are "momentarily activated", is that internal to the solenoid, or is "momentary" created by the up-down rocker switch...
  6. K

    Challenger MT 455 proposed electronic lift control Modification

    I have owned this 4 WD tractor since new. The three point lift electronics have been a real problem and continue to do so. Currently, the angle sensor has failed (again). I went on line to purchase another, only to find the part has been discontinued. I am seriously considering just...
  7. K

    Hitachi EX100-3 Overheating

    Congratulations on finding your problem. Wiring issues on these machines can be a PITA, and can extend into the bundled harnesses where they are difficult to both find and fix. Shorted wires can cause failures further down in the harness, so if the problem returns, you will know where to look...
  8. K

    Hitachi EX100-3 Overheating

    I have fought this identical problem for years, even to the point of installing an electric fan in front of the radiator on my 490E. I am now rewiring the hydraulic controls of the machine and will report on the results. Check the brittleness of the wiring. If they are cracked, I would...
  9. K

    Hitachi EX100-3 Overheating

    On my machine, I am currently rewiring all the sensors and outputs of the hydraulic CPU. It kept eating sensors like candy. The old soaked wires, especially with heat and time, lose their elasticity, crack, and become faulty. I first determined the wiring was bad by disconnecting the CPU and...
  10. K

    JD 490 Excessive Hydraulic Temperature

    The more we know, the more we know we do not know. I had the machine working great, no stalling and no overheating, then it went south AGAIN. I have found that the exposure to oil and hydraulic fluid leaches the elasticizers out of the PVC insulation on the wire conductors. As a result, the...
  11. K

    Equipment Wiring Insulation Failure

    The insulation on the wiring in my JD 490E has gone south as confirmed with a wire megger. The wiring is bundled and generally lays on the bottom of the operator's deck. It takes signals from the various sensors and through the computer, it tells the hydraulic controls of the main pump what to...
  12. K

    490E sensor failures

    I have found a "Solar Home" conversion kit on Amazon to convert the electronic controls on the 490E to totally hydraulic controls (which is advertised to get rid of the computers, sensors and wiring issues) for $685. Does anyone have experience using this conversion? How does it change...
  13. K

    490E sensor failures

    I have checked the supply voltage, it is 25V on this 24V system. Thanks for the tip on the cold starting aid piping. Today I checked the wiring after disconnecting both computers with a Megger. It indicated the insulation on the pump control wiring wiring is not good (too much leakage to...
  14. K

    490E sensor failures

    I want to pick your mind with a problem I am having with the 490E. It is repeatedly causing the failure of both the PD sensor and the angle sensor. The last ones worked for about a week, then went south. I have been using after market units made in China. When I last replaced both units...
  15. K

    JD 490 E Hydraulic Overheating

    I got the 1.45 V setting from a Master Tech as a result of a revision to the manual. The 0.45 would make the machine extremely jerky and cause repeated stalling. Try it if you like, it can be changed if it does not work for your machine.
  16. K

    JD 490 E Hydraulic Overheating

    "so I adjusted it back to the 1.7 where I had been using it to reduce the jerkiness." The "normal" setting per current revision to the JD manual is 1.45V. The higher the voltage the slower the machine's response. The lower the voltage the faster the machine responds.
  17. K

    JD 490 E Hydraulic Overheating

    I agree with mg2361. This sounds like an issue between the ignition switch and the shut off solenoid. If the voltage goes away as it should when the switch is off, the the shut off solenoid at the fuel injection pump is defective, sticking in the open position. It is normally closed by a...
  18. K

    JD 490 E Hydraulic Overheating

    If your machine overheats, stalls or is jerky, you do not know what you are missing! This machine will now dig at any engine speed without stalling or over heating. It has always required the operator to listen closely to avoid stalling, and when it got hot, re-cranking was problematic. If...
  19. K

    JD 490 E Hydraulic Overheating

    I have owned this machine for more than 10 years. In the summer it has had a hydraulic overheating problem. I have spent a lot of time and money trying to find the problem. The list of the efforts is too long to post here. The hydraulic system was hot everywhere when tested with a thermal...
  20. K

    Diesel fuel system problem

    There were no flex fuel lines. The problem was the mating of the of the the return fittings to the injectors to the return manifold.
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