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  1. 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...
  2. 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...
  3. 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...
  4. K

    Diesel fuel system problem

    I have a Cat diesel engine which recently had the fuel injector pump overhauled. Since the overhaul it cranks quickly, runs for about 10 seconds then shuts off. The re-crank takes quite a while running the starter before the engine begins running again. Once running after the re-crank, it...
  5. K

    490E Overheating & Electric fans

    The OAT here is 110, and working in direct sun makes the machine metal about 125 F. In discussions with the dealer most everyone in our area is having problems with machine heat. I have been through this machine toward lowering the heat load. Stall it hot, and restarting is a problem. I am...
  6. K

    490E PVC Finally Fixed

    I purchased a used 490 E about 6 years ago cheap. The engine ran well, everything functioned, but it was easy to stall in operation. I had the JD dealer do a service call for the stalling problem. He reported someone had installed a 5 amp fuse in the fuse block for the computer. The angle...
  7. K

    Deere 490E Hydraulic cylinder test

    I watched a video on line intended to internally test hydraulic cylinders by plugging off the main hydraulic line on the back of the cylinder (main pressure face) and plugging the hydraulic line which serves it. Then with the machine running, the return control is actuated. If the cylinder...
  8. K

    490E stuck in rabbit

    Gentlemen; I have a JD 490E that has decided to act up. The buttons to change the propel speed suddenly stopped working. It is stuck on the rabbit speed, which makes it difficult to climb grades without assistance from the stick. In addition the auto idle function has stopped working except...
  9. K

    JD Pilot Control solenoids

    I have replaced the pilot regulating valve and the pilot control control valve in my JD490E. Both are set to repair manual specifications with respect to pressures. All of the circuit solenoids have been resealed with sleeves oriented to the discharge ports upon re-installation. When I...
  10. K

    JD 490 Excessive Hydraulic Temperature

    I have a 409E with about 8,000 hours which suddenly went slow in all modes. The problem was no more than 2,000 PSI from main pump. Removed main pump for internal inspection by hydraulics shop, no issue found. During 4 months of searching, Replaced: 1. Main Pump solenoids. 2. Angle sensor 3...
  11. K

    Question on JD490E PVC code reading

    The JD 1504 technical manual says without a jumper in the computer code reader connector there should be a steady one second on and one second off PVC LED output. It also says if no fault code exists or trouble is beyond the scope of the self diagnostic function, with the jumper installed...
  12. K

    Does anyone know JD 490E PVC Ground source location?

    My 490E has lost its ground source to the pump control module. The PVC connector diagram shows the pin outs on the PVC connector but I have lost the ground source feeding to them. Does anyone know the location of the ground source for the PVC? There are 4 pins intended to bring ground...
  13. K

    Changing Loader Wheel & Tire Sizes

    This year I purchased a used loader which came with over sized wheels and tires. The tires wheels and tires appear to have come off of a timber skidder. Since I planned to use the machine in wet sand clay, my thoughts at the time were the added tire size would provide additional traction...
  14. K

    JD 490E Hydraulic System Problem

    A 490E approaching 7,000 hrs in service was working, but running toward the hot side, when it suddenly lost power and will not spool up under load. Pressure relief valves were removed checked and replaced without any issues being found. The hydraulic tank filters were removed and inspected...
  15. K

    JD 490E computer code reading

    I have a John Deere 490E excavator with two computer modules, each with a red lens to flash error codes. I also have the technical repair manual TM1505. I have found nothing in it to tell me how to read the computer error codes or what they mean. Does anyone know where I can find that...
  16. K

    Perkins lift pump blowing oil

    I have a Perkins four cylinder tractor engine blowing engine oil out of the fuel lift pump vent hole. Has anyone experienced this problem before and know its cure? I suspect it is a ventilation problem for the crank case or some emissions control valve.
  17. K

    490E Blowing pump control module

    I have a 490E which started stalling under load. I had the dealer make a service call. He found the pump control module had failed. Purchased another module, installed it, and the machine worked fine for about 8 hours, then went back into the stall mode. Inspection of the control module...
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