The LT42e Chronicles: A Tale of Wires, Woe, and Mild Electrocution

[me02822]

I have a pair of batteries with part number 625-06390, which matches a 2020 Cub Cadet CC30E (among others).
I only have the batteries and was hoping to use them in another project.
How do I get the BMS to power up the battery?
Is their a test harness for the 2020 like 725P12545 thats in the other troubleshooting pdf's? (is it the same test harness for the earlier 1 battery models?) Seems the test harness has a rocker switch that will 'wake' the battery up, any one know the pins on the 12 pin connector that it uses and can I just make my own rocker switch for this?

 

[beachbumtech]

Quick question. New mower and while mowing, everything stopped and vcm showed e111.

Now when key is inserted, I don’t hear the contractor close and it never does the single beep and light up the start button.
Does that mean the vcm is bad, or could it be a safety switch somewhere?

 

[odonnse]

Quick question. New mower and while mowing, everything stopped and vcm showed e111.

Now when key is inserted, I don’t hear the contractor close and it never does the single beep and light up the start button.
Does that mean the vcm is bad, or could it be a safety switch somewhere?

E111 is a VCM internal fault. It means the VCM failed its internal test. Unfortunately that is all the data that the VCM code sheets says. Did you review the 56V Electric Zero Turn Troubleshooting guide? That walks you through some initial steps, all three versions of these mowers are very similar electrically and share error codes. One quick, yet expensive option is to purchase a new VCM and see if it starts working. If you are electrically savvy, you can crack it open and I can give you some things to check internally.

 

[odonnse]

I have a pair of batteries with part number 625-06390, which matches a 2020 Cub Cadet CC30E (among others).
I only have the batteries and was hoping to use them in another project.
How do I get the BMS to power up the battery?
Is their a test harness for the 2020 like 725P12545 thats in the other troubleshooting pdf's? (is it the same test harness for the earlier 1 battery models?) Seems the test harness has a rocker switch that will 'wake' the battery up, any one know the pins on the 12 pin connector that it uses and can I just make my own rocker switch for this?

Did you look at the wiring diagram I posted? That at least gives signal names for the battery pins. But if I was a betting man its either pin 12 tells the battery that the VCM key is installed or its a wake on CAN situation. I was told by someone very close to the development of these batteries and development of the mower changer that the batteries and charger have way more functionality than these mowers use. For example, the charger can actually monitor cell temps while changing, but MTD did not care about that and essentially just use pack voltage to set charge parameters. Also the battery is basically an off the shelf Samsung battery pack.

 

[odonnse]

Odon you are the man. I only joined this forum to follow in your footsteps. Cant find these wiring diagrams and troubleshooting guides anywhere! I really appreciate you and the work you have done. Thank you so much, @odonnse

Much appreciated for the kind words! I had to take a little breather after the wild ride this mower took me on — it was equal parts wrenching and therapy But I’m back, and wouldn’t you know it, the saga continues… This time it’s the infamous E325 error: the dreaded right motor hall fault! (Okay, I don’t actually know how dreaded it really is yet — but it sure sounds dramatic.) Stay tuned for Part 3 of this grass-cutting epic!