Mitsubishi MM40SR

[Shade Tree]

Have at look at https://www.woodandtrees.co.uk/ This is where I've put all my information on these machines.

Thank you! Ive been searching information on these excavators mm55sr-2 and not much luck till I found this page and used this link to find a manual pdf and it didn't solve all of my questions but it did solve one mystery wire plug. Goes to the missing glow plug timer, part number found in pdf and there really commonly used and available. This machine was a big mess when I got to it but slowly it's coming together.
I need to find someone else who has a similar machine that would be willing to help me by swapping pictures of how controls and wires go because I literally have some loose ends lol.

 

[4x6HeavyMetal]

hey shadetree. im up here in clackamas county, or. maybe we can converse some time about our machines. i have an mm40.

 

[Shade Tree]

hey shadetree. im up here in clackamas county, or. maybe we can converse some time about our machines. i have an mm40.

Thank you! That would be pretty helpful. I have a couple modules that were sent out to be refurbished and have arrived back in now. I'll be putting them on in a couple days I hope and will report back.

 

[naved]

⚠️ WARNING: Avoid IMD – $4000 Controller Failure, No Support, and Now I’m Building an Open-Source Replacement​

Hi all,

I want to share my experience with IMD (IMDynamics) and why I strongly advise you do not buy their MM-R controller system, especially for excavator control retrofits like the Mitsubishi MM55SR.

---

Why I Went with IMD​

I have a background in automation and system integration. When my excavator needed a modern proportional joystick controller, I thought:

“Why reinvent the wheel? IMD already offers a product that looks like it should do the job.”

So I went ahead and ordered their MM-R system — a decision I now regret.

---

❌ What Happened​

After spending over $4000 NZD, I installed the system — and ran straight into major issues:

• Proportional joystick response is sluggish and non-linear
• Solenoids hammer and buzz violently — no matter the settings
• The system lacks the finesse and feel needed for accurate digging

I followed every instruction and even ran their joystick calibration tool — no change.

Trying to solve the issue, I went above and beyond:

• Sent them detailed voltage readings
• Shared joystick outputs in neutral and active states
• Provided photos of settings, wiring, and system behavior

Tony from IMD even admitted that some customers had experienced the same issues — but since then, they’ve stopped replying.
It’s been over two weeks with zero communication, even though they know I'm based overseas and likely can't do much about it.

---

What I’m Doing Now​

Since I’m not getting any support, I’ve decided to build my own open-source replacement using modern, accessible components.

I've already ordered the parts to build:

• A Teensy 4.1-based PWM controller
• Logic-level MOSFET drivers for the 12 V solenoids
• A touchscreen interface for settings and calibration
• Full safety and fine-tune logic: deadzones, curves, neutral switch, etc.

I’ll be releasing everything publicly: parts list, wiring diagram, source code, configuration tool — all for free.

The entire build will cost $400–$500 NZD total, and will be better-performing than IMD’s system with actual support.

---

Bottom Line​

If you're considering buying from IMD — don’t.
They may look like a professional outfit, but when things go wrong, you’re on your own — especially if you’re not local.

I made the mistake of trusting them instead of building my own solution. Now I’m fixing that, and I’ll be sharing every step of the way to make sure no one else gets caught the same way.

 

[Kenr]

⚠️ WARNING: Avoid IMD – $4000 Controller Failure, No Support, and Now I’m Building an Open-Source Replacement​

Hi all,

I want to share my experience with IMD (IMDynamics) and why I strongly advise you do not buy their MM-R controller system, especially for excavator control retrofits like the Mitsubishi MM55SR.

---

Why I Went with IMD​

I have a background in automation and system integration. When my excavator needed a modern proportional joystick controller, I thought:


So I went ahead and ordered their MM-R system — a decision I now regret.

---

❌ What Happened​

After spending over $4000 NZD, I installed the system — and ran straight into major issues:

• Proportional joystick response is sluggish and non-linear
• Solenoids hammer and buzz violently — no matter the settings
• The system lacks the finesse and feel needed for accurate digging

I followed every instruction and even ran their joystick calibration tool — no change.

Trying to solve the issue, I went above and beyond:

• Sent them detailed voltage readings
• Shared joystick outputs in neutral and active states
• Provided photos of settings, wiring, and system behavior

Tony from IMD even admitted that some customers had experienced the same issues — but since then, they’ve stopped replying.
It’s been over two weeks with zero communication, even though they know I'm based overseas and likely can't do much about it.

---

What I’m Doing Now​

Since I’m not getting any support, I’ve decided to build my own open-source replacement using modern, accessible components.

I've already ordered the parts to build:

• A Teensy 4.1-based PWM controller
• Logic-level MOSFET drivers for the 12 V solenoids
• A touchscreen interface for settings and calibration
• Full safety and fine-tune logic: deadzones, curves, neutral switch, etc.

The entire build will cost $400–$500 NZD total, and will be better-performing than IMD’s system with actual support.

---

Bottom Line​

If you're considering buying from IMD — don’t.
They may look like a professional outfit, but when things go wrong, you’re on your own — especially if you’re not local.

I made the mistake of trusting them instead of building my own solution. Now I’m fixing that, and I’ll be sharing every step of the way to make sure no one else gets caught the same way.

Hello, did you ever complete yout system.