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  1. #1
    New Member
    Join Date
    Mar 2010

    Default b7100

    can someone tell me how to test if the dynamo is shot without taking it off,
    I live in Costa Rica and just recently traded in a kubota B7100 and apparently does not charge, the fan turns alright but it looks like a job to take it off, or is there an easier way than taking the front panel off>>

  2. #2
    Platinum Member
    Join Date
    Jun 2003
    Western Illinois
    Kubota B2400

    Default Re: b7100

    Take a voltage reading with tractor off. Start tractor and take a reading ( from battery) with tractor running at 1/2 throttle. Running voltage should be 13.8-14.5 volts and static should be 12.5-12.8.

  3. #3
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
    Nova Scotia, Canada

    Default Re: b7100

    Use an a meter to check the dynamo output. If it needs replacing pull the oil cooler and radiator. It's not difficult. The housing holding the dynamo will have one bolt that is difficult to access. Bend a wrench to fit or use a ratcheting wrench.

    There are threads here giving descriptions of doing this job.
    50 years behind the times
    Livin in a
    Worn out skin bag filled with rattlin bones

  4. #4
    Veteran Member brain55's Avatar
    Join Date
    Jan 2008
    Brentwood, CA

    Default Re: b7100

    The dynamo output should be at least 20 volts AC across the 2 wires with them unplugged and the tractor at full throttle. In over 20 years I have only seen 2 dynamo electrical failures, all other failures have been bearing failures. Most likely the voltage regulator is bad.


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