Kohler 20hp charging question

Discussion in 'Mechanic and Repair' started by ericg, Apr 28, 2007.

  1. ericg

    ericg LawnSite Silver Member
    Posts: 2,556

    I have a Kohler 20hp twin cylinder horizontal shaft motor in a 48" Walker mower. The engine would not turn over so I charged the batery and then load tested it. The battery failed the load test so I replaced it. The engine started right up but the voltmeter on the instrument panel is only reading slightly higher than 12 volts. I placed a voltmeter on the battery with the engine running and it is reading 12.6 volts. Is this acceptable? If not, what wires do I have to check to determine if the regulator is functioning properly.
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    When you performed the test was the engine at FULL throttle ?
     
  3. ericg

    ericg LawnSite Silver Member
    Posts: 2,556

    Restorob, thank you for the quick reply. The voltage at the battery went up less than a half of a volt from idle approx 3600 rpm. The max I could get from the charging system is 12.65. I checked all of the grounds and they are good.
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Un-plug the voltage regulator and put your multimeter on AC volts, Put a test lead on each of the white wires. Start the engine and run at full throttle, You should get 28 or more volts.

    If lower than 28 the stator is bad.

    If you do get 28 or above AC volts check the ground wire/strap on the voltage regulator for corrosion, Also check for battery voltage on the center wire in the regulator plug with the key in the run position.

    If stator test OK, Regulator ground is good and there is voltage to the center regulator wire replace the voltage regulator.
     
  5. ericg

    ericg LawnSite Silver Member
    Posts: 2,556

    Thanks so much Restorob. I will check this tomorrow. This is a great site and it is members like yourself that go above and beyond to help.
     
  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Thanks ericg !

    It was no problem.....
     
  7. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,104

    I worked on Walkers every day. Check the ground lead at the voltage regulator. Also with the engine off but the key in the run position check to see if you are getting 12 volts DC at the voltage regulator on the middle lead wire.
     
  8. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,104

  9. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    Hmmm.....Did I miss something here. :confused:
     
  10. ericg

    ericg LawnSite Silver Member
    Posts: 2,556

    I finally got the machine back from the dealer. He said that a leaking engine seal caused the stator to become shorted to ground. He replaced the stator, engine seal and regulator and charged me $300.00. He gave me the stator and showed me with an ohm meter that it was shorted to ground. Has anyone ever heard of a bad engine seal causing this problem with the stator? Again, thanks to everyone who responded to my post. This is a great site.

    Eric
     

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