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Re: (ET) E20EA troubles - and here comes the snow!



The EAgle soars again! (E20EA, that is.) Jumped out CB-3 and the tractor behaved liked the champ it is. Only trouble now is that it's in 2+ feet of snow... I shoulda parked it closer to the action. Anyway, seems obvious in retrospect. "So late, so smart," as grandpa used to say.

Thank you, everyone, for your suggestions and support.

That was a pretty good storm.

Here's a pic of the E20 after the storm but before the critical test of CB-3:
http://www.flickr.com/photos/26110615@N03/8462636861/

On Sat, Feb 9, 2013 at 5:47 PM, Max Hall <mhall maxmatic com> wrote:
You guys are great.


On Sat, Feb 9, 2013 at 5:45 PM, RJ Kanary <rjkanary consolidated net> wrote:
      Harold Zimmerman has sent you a more technically proper and correct 'Trouble Tree' diagnostic path. His might be easier to follow. :)

          You should forward this to Harold . <VBG>

RJ



On 2/9/2013 5:35 PM, Max Hall wrote:
Psychic, RJ. You somehow knew I was fiddling with CB-1 and not CB-3. Jeez, do I feel like a chowdahead.

Ok, I am going to try a continuity check from the low side of the RTN and RTN-R relays to their next stop, the high side of the brake sw.

It's GOTTA BE CB-3. It fits all the data.

Famous. Last. Words.

Thanks,

-M

On Saturday, February 9, 2013, RJ Kanary wrote:

    By way of review,here's Who's on first, What's on Second.

    CB-1
    Large Klixon®, large wires, found on the outside of the traction
    motor.Opens positive side of circuit to all loads except
    lighting in the event of traction motor overtemp, or excessive
    current draw. On the E-20, the nominal rating is 125 A .

    CB-2
    Resettable 40 or 50 A Klixon®,found under the hood,on upper
    control cabinet underhood panel.Keeps shorted charger diodes
    from setting the tractor afire.

    CB-3
    Small Klixon®,located inside the traction motor in the field
    windings.Its sole purpose is the interrupt power to the coils of
    RTN-F and RTN-R in the event of traction motor overtemp.

    Any questions ? :)



    RJ

    On 2/9/2013 12:48 PM, Max Hall wrote:
    2' easily here, west of Boston.

    Curiouser and curiouser: Bypassing the big circuit breaker on
    the motor, CB-3 on the E20EA, changed... nothing.

    HOWEVER... (as Buckminster Fuller used to say, "you can't know
    *less* after you do an experiment!") I observed unexplainable
    (so far, by me) behavior: The VOLTMETER cut out when I
    disconnected wires from CB-3. According to the schem, the path
    to ground for the VM has nothing to do with CB3! I'm sure it is
    thoroughly relevant... somehow! (The fact that it worked when I
    parked it seems crazier than ever.)

    I wish I didn't have to debug out in the snow. Not that it
    isn't kinda purdy as the clear, high pressure air starts to
    move in. It's that cool, particle-laden breeze that's tough.



    On Fri, Feb 8, 2013 at 6:23 PM, The CZ Unit
    <cz alembic crystel com> wrote:

        The big circuit breaker mounted on the motor. It powers the
        contactors and all that good stuff. Check to see if it's
        open or has been knocked off. If open and you need the
        tractor try bypassing it and don't overload the thing.

        Note: Blowing 2+ feet of snow uphill and pulling >300a from
        the pack is not in my mind "overloading" :-)

        Wish we had 2 feet of snow. Sigh.
        Chris


        On 2/8/2013 4:59 PM, Max Hall wrote:

            RJ, Larry, Walt, Nick, all,

            THANKS!

            I'm sure it's something stoopid, but I haven't figured
            it out yet! I did
            check the keyswitch, brake switch, and seat switch...
            all are good, all
            are making.

            There's only one other suspect in the path to ground.
            The schematic RJ
            sent sure points a finger at "CB-3 in motor"... what
            the heck? A
            low-current circuit breaker "In Motor"? I'll know soon
            enough... I have
            to suit up again to get out there and under the thing
            to have a look.

            I hope you all are safe and well in snow or not, and
            thanks again for
            your replies,

            LOVE THOSE TRACTORS!

            -Max

            On Fri, Feb 8, 2013 at 2:49 PM, Max Hall
            <mhall maxmatic com
            <mailto:mhall maxmatic com>> wrote:

                Hi, all,

                I'm stuck. No forward speeds, no reverse speeds.

                My ol' manual only has schematics up through AA and
            BA, and I think
                I'm missing something important!

                If I use my finger to actuate RTN or RTN-R, the
            tractor behaves
                perfectly. But neither RTN not RTN-R will pull in
            by itself!

                Anyone have a schematic for the E20EA?

                -Max in Boston

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