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Jd 6400 tachometer

B

Barryn

New User
I put a 4045 power tech motor in my 6400 out of a streetsweeper with 2600hrs on it.
When we installed the tach sensor in new motor it says at idle it is running 1200rpms and if you go full throttle it goes as far as the tach will go.
According to jd they take the same part number (sensor) for tach.

Any ideas? Any help is greatly appreciated.
 
Hello Barry welcome to YT! How did the wiring work
out between the two engines. Were the sensors in the
same location or different like one up front by the
crank and the other by the flywheel?
 
On both engines they were right by the injection pump. Both engines use the same part number for the sensor. The wiring was all the same.
 
The injector pump also turns at half the speed of the crankshaft. There has to be a 50% reduction somewhere between the crankshaft and the injector pump head. My guess is that the sensor is reading a full speed gear on the replacement engine and a half speed gear on the original engine. The sensor reads the pulse of each revolution of the gear. Your tach is calibrated to translate two engine revolutions per pulse. The correct tach for that engine would be calibrated to read one engine revolution per pulse. Repeat - that's a guess.
 
If I was to guess, I'd say that there is a different tooth count on the reluctor wheel on this engine that pulses the signal for
that sensor. Probably somewhere in the vicinity of 30% more teeth than the other one, hence the higher frequency/faster speed
reading. I'm not sure how that cluster works, but assuming there is some manner of doing diagnostics on it, you may be able to
change a parameter for the signal.
I'm assuming that this is a mechanical vs electronic engine.
Rod
 
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