Hank,
Considering the advice and help that Harold gave you for free, why not just
buy a new breaker from him?
Mike in KY
-----Original Message-----
From: Hank Ralston [mailto:Hank RalstonAgency com]
Sent: Monday, May 20, 2019 10:54 AM
To: Harold Zimmerman - Clean Power Supply; elec-trak cosmos phy tufts edu
Subject: Re: (ET) Running but still odd things, tiny screw head on the
thermal breaker, left or right?
Agree with 3 for three, get a new switch! Thanks for the tip about keeping
it in 3dr during mowing & plowing. I noticed that it does push up the
power
usage above 3rd. the prior problem was getting out of 2nd and not heating
up the front end with those resister strips. It is sort of fun to lift
the
deck and run down our cul-de-sac to clean out the teds after cutting.
Yes the micro switches do wear down after 40+ years and I replaced then all
about 4 years ago. Likewise the 2 boards and I of the 2 relays.
Looks like I'll check through the links for a new thermal breaker.
Thanks,
Hank
-----Original Message-----
From: Harold Zimmerman - Clean Power Supply [mailto:cleanpower mailbug com]
Sent: Monday, May 20, 2019 11:34 AM
To: Hank Ralston <Hank RalstonAgency com>; elec-trak cosmos phy tufts edu
Subject: Re: (ET) Running but still odd things, tiny screw head on the
thermal breaker, left or right?
Hank,
I wouldn't do it. :-)
Are you sure you have all 7 speeds? You should be running in 3rd speed
forward for most of your driving time, which bypasses the power resistor up
in the front of the machine. If that resistor is still heating up you are
probably missing a speed.
If you are running wide open all the time, that is, with Field Weakening
in
the circuit, you will be drawing high amps and tripping the circuit breaker
could be expected.
I would consider changing out all the switches in the speed control
except
for the F/R switch (can be done for under 50 bucks) and all the terminals
going to cards 1 and 3 (again, not much cost), and if you feel the circuit
breaker is over-sensitive, I would replace it with a new one (again, less
than 50 bucks) Sincerely, Harold Zimmerman Clean Power Supply
On May 20, 2019 at 9:55am -0400, you wrote:
Finally got my ET15 to go in all speeds forward and back by pushing in all
the shifter micro switch and tighten them down a bit more than they were.
Also tightened some of the clips on the card, just a little at a time, and
put some new fasteners on wire group 49 & 11 that go to the forward and
back
relays.
Still a bit quirky, but at almost 50 years old guess we all were, even with
new boards and a new relay.
My problem now mirrors yours. The freak 'n thermal switch seems to be too
sensitive. I'm very safety minded, (RIT engineering student, commercial
Underwriter & Insurance agent), but I'm tempted to by bass it like I did
on
the many years ago for the snow thrower's circuit breaker.
II see that there is a tiny screw head on the thermal breaker. Can it be
adjusted? It so, turn to the left or the right?
Thanks,
Hank
Ralston Agency, Inc.
-----Original Message-----
From: Chris Zach [mailto:cz alembic crystel com]
Sent: Monday, May 20, 2019 8:01 AM
To: Elec-trak list <elec-trak cosmos phy tufts edu>
Subject: (ET) Running but still odd things.
Well, I finally finished refurbishing the deck with a new shell. This one
has baffles, which means I need to think a bit before putting in my
stiffener bar over the discharge chute (which is currently only supported
by
the little blanking plate). That part of the deck takes a lot of stress,
need to think about it a bit.
Fired it up, lot of vibration. Took the blades off, spent some time with a
cheap-o balancer (the Home Depot one doesn't really fit the holes) and took
some metal off one side on each blade. Now there is a lot less vibration,
but not quite perfect. Good enough.
New problem is that the tractor is going into speed 4 right off the bat
even though all contactors are *not* closed. Very weird. In reverse it
feels
like the field is not coming on, also weird as the motor heats up quickly
and trips the thermal switch on the motor housing.
I'm not sure if there is a field problem or a short in the main wiring or
something else. It's never dull, I'll check tomorrow when the weather is
down to the 70's.
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