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Those contactors sound
like the 'L' contactors used in the E-8/ 10 M models.
Since neither the Power Pulse
button or the centrifugal switch seems to have any effect, here's the run down
on possibilities.
1.)Failed 2A switch in throttle
assembly.
2.)Open in Wire 57 at connector J
2-6.
3.)Open in Wire 13 {Green.}
.
The beauty of this control system is, there just isn't much there to go
wrong. A few moments with a trusty VOM, you will have it puzzled
out.
- Original Message -----
Sent: Sunday, February 20, 2005 4:41
AM
Subject: (ET) Late-model E12 (JDseries)
3rd speed not working
Hi all,
I've restored a JD-series E12 to "mostly running" condition. The
last thing I need to do is get the 3rd (A2) speed back. Speed control
switch tests ok with VOM. The A1/A2 solenoids/contactors are the
bakelite-looking short, stubby solenoids like you find in golf carts.
They sit horizontally on the control panel above the "normal" vertical F, PTO,
and R contactors. Those of you with the Home Owner's Service Manual can
find a diagram in the back of Chapter 7, with the E14,16,... Anyway, I
replaced the A1 contactor, as it was rattling like a machine gun when shifting
into 2nd speed. Now, the 2nd speed runs great, but I still can't get A2
to work for the 3rd speed. I assume that the A2 contactor works
properly, because I can switch it with the A1, and get the same result.
I'm also only measuring 2+ volts across the big terminals on either contactor,
when the manual says I should find 4.
Other info--this version of the E12 has the PM drive motor with a
centrifugal switch, and the manual says the armature must be rotating fast
enough to close that switch. I think it must be, as it sounds fine, and
goes almost as fast as my E12s in the same range/speed. I also tried to
energize the A2 contactor by using the Power Pulse button with the armature
stopped to bypass the centrifugal switch, but no luck.
Any ideas?
Thanks,
Tom Pattee
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