The "Apollo Era" material used to insulate the A&S
terminals from the motor case deteriorate. When an attempt is made to
address this concern without motor removal and disassembly, invariably
the stud gets rotated and the brush or shunt lead is now firmly in
contact with the motor case.
Other Hot Chassis Hall Of Fame members are:
Fuel Gauge / Voltmeter
Armature resistors and their bypassing contactors
Armature reversing contactors, if present
The lifts, front or rear is present.
The OEM charger.
RJ
SteveS wrote:
And
sometimes the cables rub against the motor pulley.
- SteveS
Konstanty, Walter (GE Energy Services) wrote:
A word to the wise;
1 ground may be ok to run.
2 grounds will definitely let you know where the problem is - both
grounds will conduct high current and create damage.
Cables that go thru holes (lift, motor leads) can be a source of
trouble.
...Walt
-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of
Christopher
Zach
Sent: Wednesday, April 28, 2010 10:23 AM
To: Bill Alburty
Cc: elec-trak cosmos phy tufts edu
Subject: Re: (ET) sparks!
Interesting. I too have a ground fault on my tractor; in my case it's
inside the motor itself.
I'm guessing the root problem is that dust from the brushes has built
up
and is now conducting to the case. It's not the field, it's the
armature
and it is annoying.
One of these days I will drop the motor, take it apart, and clean it
out.
Chris
Bill Alburty wrote:
Thon, I was surprised to see your post
because I had the same experience plus some excitement here with my
E-12 tonight!. While removing the nuts and bolts to get the right side
panel off, I had to partially remove the charger cage and accidentally
scraped it (actually the resistors strips) on the chassis. Even though
the main disconnect and the key were off, it took off in reverse and I
had to jump on and ride it and figure out how to stop it. Fortunately
it didn't run into anything. When I jiggled the charger cage it stopped
and I saw that the R1 strap was burnt in two. I've know for a long time
that I have a ground fault but haven't tried real hard to fix it.
The charger cage has had 13 volts on it for
some time and I use a
piece of wood to insulate the mounting screw.
Someone said a likely place for the ground
fault is in the lift motor.
I've got a replacement for the R1 resistor,
so I'll see if that fixes it tomorrow. Our problems are similar. I
would say your charger cage has a voltage on it and if its not
insulated from the frame, the frame
is hot also. Good luck fixing it.
Bill Alburty E-12 Kansas
tbamc wrote:
While looking into my sporadic working
forward gears problem I disconnected the neg. battery terminal closest
to the charger. When hooking it back up I managed to scrape it across
the cage over the charger and got a decent sized spark. Main disconnect
and key, were
off.
Does this mean I've got a ground fault I
need to find? :-)
Thanks.
Thon
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