Re: (ET) Trouble with my C-185

["Pestka, Dennis J" <Dennis Pestka Covidien com>]

Harold;

Tried your unscientific experiment with no success.
Don't know if this had to do with anything, but now I can't get Reverse to 
work either.
To answer another question, I'm seeing no current draw when accelerator is 
engaged.

I think it's time to jack the tractor up, and make sure I have no grounded 
wires, or ones that mice may have chewed on.
Everything up top looks OK, but I can't see very well underneath without 
getting it up in the air.

Looks like I have further investigation to do.

Thanks;
Dennis



-----Original Message-----
From: Clean Power Supply [mailto:cleanpower att net] 
Sent: Friday, May 03, 2013 10:39 AM
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) Trouble with my C-185

 Larry has it pretty well laid out here.
 Just to clarify: The black phenolic contactors were never used for 
armature reversing. They are 1A and 2A functions.
 Dennis,
 Let's do an unscientific experiment. Turn master on, turn key on, sit on 
seat, put toggle switch in forward, depress pedal. Smack each lower 
contactor smartly with the handle of a screwdriver. If the motor runs you 
have a faulty contactor.
 BTW,
 In your C-185 the 4 open devices on the upper control panel are called 
relays, the 2 black phenolic devices on the lower control panel are 1A 
contactor and 2A contactor. The one in the middle is the PTO contactor , 
the lower left 6-terminal steel is the F contactor and the lower right one 
is the R contactor.
 Let us know what you find.
 Sincerely,
 Harold Z.
On May 3, 2013 at 11:15am -0400, you wrote:
>My I-5 had a similar failure that was due to a bad Forward contactor,
>one of the 6-terminal types.  Those devices depend on a spring (and
>gravity) to close the normally-closed contacts, whereas the
>normally-open contacts are closed by the rather hefty electromagnet
>coil.  If the F contactor's normally-closed contacts are open, then
>you'll loose forward motion.  The motor will *not* draw any current
>but will act as if one of its armature connections was missing (which
>it effectively is!).
>
>The older, double-stacked, contactors don't have that problem because
>both sets of contacts are actuated by electromagnetic action.
>
>Larry Chace, Ithaca, NY I-5 and E15
>
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>Elec-trak mailing list
>Elec-trak cosmos phy tufts edu
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