Posted by JDseller on June 17, 2011 at 23:14:33 from (208.126.196.144):
In Reply to: JD 4040 starter posted by 65mas162 on June 17, 2011 at 21:04:25:
The wiring you need to check is pretty simple. You will need a volt/ohm meter not a test light. You need to see if you have full voltage. Not just power.
1)Start at the key switch and see if you have full voltage there. (Check the voltage at the batteries to get what the max is)
2)Then the power goes to the neutral starter switch. On a Quad range the switch is on the right side just back of the battery box. On a power shift it is still on the right but on the PS valve body. The power goes to the starter solenoid from there.
What usually happens is that the starter starts to pull the voltage down therefore raising the amperage draw. The low voltage will overheat the contacts inside of the stater solenoid causing them to stick together. This will cause the starter to stay in the flywheel if it starts. This usually explodes the starter armature. So his new starter should solve that problem.
Check and make sure you are getting full voltage at the starter while cranking. The battery cables can corrode internally and look good but not carry the full current. The cross over cable on the 40 series is bad about doing this. This will damage his new starter.
The best way to do this is to check what voltage drop you are getting at the batteries while the tractor is being cranked. Then check the voltage drop at the starter while cranking. If the two match then the cables are good. If the voltage drops much more at the starter then you know the cables/connections are not carrying the full voltage/amperage that they should.
ALSO !!!!! There is a kit available from JD that puts a relay in the circuit from the key switch/neutral switch. You just put the wire that would normally go the the starter solenoid on the new relay. Then power the relay directly from the battery cable connection on the stater. So all the power the key switch and neutral starter switch then sees is just the amps needed to pull in the relay. Not the higher starter solenoid amperage. The kit comes with instructions and is easy to install. It will help prevent much of the starter solenoid problems caused by low voltage. I am going from memory here ( danger LOL) the kit part number is RE170320. Cost about $25. I always keep one in my tool box. It even helps on the older 10 and 20 series tractor too. It make the starter solenoid engage much better.
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