Go BottomJD 4300 dies when shifting forward or reverse
 | angmach
Join Date: Nov 2009 Posts: 7 La Monte, MO 
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2009-11-06 166764
1999 JD 4300 intermittingly dies whenever I shift Sync Reverser lever to either forward or reverse. Will keep running if I put it back into nuetral position right away. Usually happens after starting, but has happened as I'm driving along or changing directions. Suspect sticky switch or interlock.
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| hardwood
Join Date: Dec 2002 Posts: 3583 iowa 
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2009-11-07 166776
Somehow my tech manual has grown legs, I was going to trace the circuts for you. I know a couple other guys here have them so maybe they can chime in to help. My first guess would be the reverser switch its'self. Mine on the 4310 gets a bit goofy if I get too wild with the power washer. ....
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| angmach
Join Date: Nov 2009 Posts: 7 La Monte, MO
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2009-11-10 166815
Narrowed it down to the seat safety switch circuit. PTO also kills the engine. The previous owner snipped a bunch of wires ot the back of the tractor so I don't know which is for the seat. Checked with dealer for wire colors and what colors they told me are not to be found. did find 2 wires twisted together which I think may be it, but ran out of daylight to check for voltage, ground, etc. Possible relay in the circuit somewhere? ....
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| angmach
Join Date: Nov 2009 Posts: 7 La Monte, MO
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2009-11-11 166823
Got'r fixed. After talking with the dealership, I started checking the eng run relay and a diode block. I got proper voltage once. So I went to the wiring from the seat switch, used a jumper wire, and took it to the other end near the fuse block. Runs as advertised. Taped my connections and off I went. ....
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 | kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon
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2009-11-11 166824
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Congratulations on the fix, but I'm not quite clear on exactly what you did. When you say you got voltage once did you mean that other times you got the wrong voltage? And you ran a wire that jumped out the seat switch and went right to the fuse block? Could the seat switch have been bad, either bad connections or a high resistance in it?
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| angmach
Join Date: Nov 2009 Posts: 7 La Monte, MO
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2009-11-11 166825
previous owner had cut off the connector for the seat switch and tied the ends together. Between that end and the fuse block for the relay, there was a intermittent break. I tied in a second wire at the seat end and ran it to the fuse block end. ....
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| kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon
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2009-11-12 166833
Understood, and thanks for posting back. All that lawyer mandated crap makes these machines much more complex than they need to be. ....
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| angmach
Join Date: Nov 2009 Posts: 7 La Monte, MO
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2009-11-13 166839
Well, I thought I had it fixed. ran about 4-5 hours over 2 days with no problems. Then today I hopped on, started up, warmed up, put it in gear and it dies. Went back to checking volts on the repaired wire, relay, and diode box connectors and jumping different connectors. I came up with a weak diode. Only flows about 10 volts. I always thought a diode was all or nothing. But when I jump it direct, everything is fine. ....
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