4210 ehydo calibration help

[Big Jon]

Now can you adjust the POT to spec? It is at the right speed now need the POT to read correctly.

Mfreund
Let me rephrase previous post.
I have tried adjusting the throttle pot after I got the rpm to spec 1000rpm + - 50. On a cold start it is near 975 as she warms up around 1000 rpm. After rpm set played with pot from one one adjustment far left to another far right and it would not pass.

 

[Big Jon]

Mfreund
Let me rephrase previous post.
I have tried adjusting the throttle pot after I got the rpm to spec 1000rpm + - 50. On a cold start it is near 975 as she warms up around 1000 rpm. After rpm set played with pot from one one adjustment far left to another far right and it would not pass.

Set screw is seized sprayed down with lubes waiting to break free to reset linkage arm to original spec then I will adjust pot again to see if I can get it to pass...

 

[mfreund]

If you use a digital volt meter, check the V between the middle wire and ground. You should be able to set it at Bottom Of Travel (BOT) and Top O Travel(TOT). Then try the calibration.

 

[Big Jon]

Well finally got it. Replaced the throttle pot and adjusted, and adjusted and adjusted. Had nothing to do with the lower linkage. You can actually complete this without JD part to calibrate and just complete with a descent digital meter. It is spitting another code of the cruise which I believe was causing me problems. The low idle voltage was just barely within spec the fast idle was dead on. Just cleared the low idle voltage by 0.1v.

I trace the code of the cruise down to a bad switch.

Thanks mfreund for the help.

 

[mfreund]

I have been off for a while, I am glad you are back running. As I said before the calibration will not fix any problems and will likely cause more problems. That is the voice of experience.

 

[TheBusGuy]

Good morning everyone. I apologize in advance for this post being long winded.
Jon and I have been working feverishly the past couple days to get to the bottom of this "code 4" flywheel speed sensor issue.

What we have:
1. 5v reference on all potentiometers, throttle, fwd, reverse.
2. Both the mfwd (org/blk) and flywheel speed sensor (red/blk) show 5v reference.
3. Their signal wires brown and green are both showing 2.395/2.4v with the key on.
4. The mfwd reference voltage drops iirc with the tractor in motion and the throttle signal Voltage follows the throttle position so both sensors seem to check out.
5. Battery voltage at the rear pto, load match switch, and brake light switch.
6. 925+/- 25rpm low idle speed and 2810+/- 25rpm high idle speed.

I'm sure I'm leaving a few things out since I don't have the tractor in front of me at this time. Hopefully Jon will be along soon with input on what I may be missing.

 

[beenthere]

Who's "Jon" ??

:welcome: to TBN

 

[TheBusGuy]

The OP. The gentleman who started this thread

 

[beenthere]

OK, got it. Last post 2 and half years ago. Goes by "Big Jon"

 

[TheBusGuy]

Roger that. No sense in starting a new thread for what is somewhat the same issue. Glad we're on the same page here now, BeenThere.