Kohler starter motor problem

Discussion in 'Mechanic and Repair' started by peterdee, Aug 25, 2014.

  1. peterdee

    peterdee LawnSite Member
    Posts: 19

    we have an MTD Cub Cadet with Command OHV 16 engine fitted with Kohler 25 098 08 starter motor.Suddenly refused to start, starter not engaging with the fly wheel. dismounted starter and checked performance; running lazily. Checked wiring, A OK, fitted slave solenoid. Starter now runs fine but still does not engage with fly wheel.
    There was a thread on here in 2005 about this problem with the Kohler starter, and Kohler's refusal to recognise the fact, apart from publishing an alternate wiring diagram to prevent the starter motor running on. What was not discussed was a solution to the situation. Is there a solution? I'm thinking of touching up the teeth on the starter dog; doing the same to the fly wheel, machining the fly wheel and rotating it?? But they don't seem badly damaged. With this starter motor doing what it is supposed to do, apart from engaging, I can't see any benefit in fitting a new starter.
    Any thoughts from you guys out there would be appreciated.
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Can you perform a test ?

    Put a multimeter black lead to ground and red lead on the small solenoid activation wire, Turn the key and post the voltage on this wire while trying to crank.....
     
  3. peterdee

    peterdee LawnSite Member
    Posts: 19

    multi meter gives 10.56v on cranking. At rest battery gives 12.6v
     
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    John Deere for one of a couple other equipment makers had starter engagement problems, They came out with a starter relay kit that solved the issue.

    You can install a relay which would give the solenoid full battery voltage (12.6), That should cause the bendix drive gear to engage the flywheel ring gear harder.

    You can pick up a 30 amp relay at any auto parts store and wire as below and see if that solves your issue, I've done it on a few machines...... Mount the relay to the frame near the starter......


    [​IMG]
     
  5. peterdee

    peterdee LawnSite Member
    Posts: 19

    Thanks. I will try that. Let you know. But what is the problem with existing set up? Is there some resistance somewhere?
     
  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Resistance in wiring/switches and connections can rise over time......It's quicker/easier and less cost to add a relay to see if that solves the issue rather than replacing a starter/harness or any switches......
     
  7. peterdee

    peterdee LawnSite Member
    Posts: 19

    I've put in a slave relay, which is essentially the same thing as a relay. The wiring is the same. That has not cured the problem. I wonder if the resistance lies in the braided wire between the starter solenoid and the motor?
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    I need the full engine model AND spec numbers to go any further at this point.....
     
  9. peterdee

    peterdee LawnSite Member
    Posts: 19

    when I said slave relay, I meant slave solenoid! I'm not sure where the engine no is? I guess on the carburetor side of the engine, but everything is covered up; don't want to take the whole machine apart! I have lots of other numbers relating to MTD but I guess the key is the engine no.
     
  10. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    OK, I see your in England so lets get on the same page here.....


    You have a 25 098 08 solenoid shift starter, Did you replace the solenoid on the starter it's self ?

    Or did you just add a "slave" solenoid wired to the solenoid on the starter ?

    Does the starter spin but just not engage the flywheel ?

    BTW, There's only three plastic wing nuts holding the side panels on and you don't even have to fully remove them to get the panel off.......
     
    Last edited: Sep 1, 2014

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