Re: (ET) Fast Starts

[jjcrmc39 icloud com]

Wow,

Wrote 'I loved my E12’s.’  Maybe Ken can explain how =E2=80=99s got in 
there.

Cheers, Jack

> On Aug 13, 2024, at 3:03 PM, jjcrmc39 icloud com wrote:
> 
> Content-Transfer-Encoding: quoted-printable
> Message-Id: <C115B1D2-B305-4385-A058-6C3530A549E7 icloud com>
> References: <17ca5b57db06ee3277b2c759357f12e6 kirk net>
> <84fcf3a2-4721-481d-a6be-1e3d8d732772 bunsen crystel com>
> To: Christopher Zach <cz bunsen crystel com>
> 
> Okay,Chris knows more than me.  I loved my E12=E2=80=99s, found them =
> understandable and fixable for a non-tech.  Now, and probably for a good 
> =
> reason, Chris doesn=E2=80=99t mention the throttle.  Having had two =
> throttle issues and because it=E2=80=99s a moving part, it the first =
> place I go.  They always need cleaning.
> 
> My only contactor failure was caused by the mope I bought the second E12 
> =
> from.  He wired wires 15 and 28 to one post on the RTN and changed the =
> schematic he gave me to reflect this.  Bill Gunn, with the patience of =
> Job, helped me solve this. =20
> 
> Lotsa luck, Jack
> 
>> On Aug 13, 2024, at 11:27 AM, Christopher Zach via Elec-trak =
> <elec-trak cosmos phy tufts edu> wrote:
>> =20
>> Well, first the tractor should be stepping through the speeds. If it =
> goes straight to full power then either the contactors are shorted =
> closed, or all contactors are closing in speed 1. Fix this. :-)
>> =20
>> Or maybe the resistor up front is not wired properly. Check that.
>> =20
>> There also should be a centrifugal clutch on the end of the motor that =
> doesn't allow full power if the motor is stalled. There is usually a =
> "power pulse" button that bypasses this, check to see if that switch is =
> always closed. But even then it should go to speed 1,2,3 as you move the 
> =
> throttle forward.
>> =20
>> And yes, an E12-E20 going from nothing to full power will kick. The =
> E20 depended on the contactors closing in sequence to prevent this, the =
> E15 used SCR based time delays.
>> =20
>> C
>> =20
>> =20
>> On 8/13/2024 7:53 AM, David Kirk wrote:
>>> Getting my E12 back on four wheels after complete restoration. The =
> tractor came with one electrical speed, "Start" or speed #1 works while =
> speeds #2 and #3 engage the contactor(s) which I can hear clicking but =
> the speed does not change. I need to spend some time with the repair =
> manual and track it down.
>>> The immediate problem is that when the tractor is first engaged it =
> starts so fast the  front wheels lift off the ground. Sure it isn't =
> supposed to do that, is there a slow-start system that has failed, or =
> what makes the tractor start without lifting the front wheels? Even in =
> L2 it really throws the driver back.
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