MS MX Large DU miling/buzzing sound and degraded isolation repair manual – BMS_w035 BMS_f071#20236118124 (updated 8.7.2025)

Price for operation manual:
Repair manual price: 4600€ + Tax BUY REPAIR MANUAL This operation manual is a proprietary business secret that outlines the successful refurbishment process for Large DU powertrain system. By following the provided instruction steps, which include text, images, and videos, you will be fully equipped to repair the LDU effectively and efficiently

This training consists of online training and hands-on training in our laboratory with the same vehicle

Info
You can charge this service: 3500€
You need 16 labor hours to deploy this repair
Info
Common causes:

  • Coolant ingress
  • Failed rotor shaft seal
  • Failed rotor ball bearing
  • Failed rotor jackshaft ball bearing
  • Stator overheat
  • Rotor overheat
  • Highspeed highway driving
  • Coolant damage at stator winding
  • Moisture ingress
  • HV Cable seal fail
  • All LDU labeled RMN are lowest quality and normal tear&wear at 100k KM
  • Stator Low quality
Info
Errors:
  • BMS_w035,
  • BMS_f071,
  • DI_W072,
  • Milling, Grinding, Buzzing sound from electric motor during driving,
Info
Part numbers:
  • 1007972-00-B,
  • 1056680-00-Q,
  • 1002633-00-T, SPORT
  • 1002633-01-P,
  • 1002633-01-T,
  • 1025276-00-Q,
  • 1025598-00-P, SPORT
  • 1025598-00-T,
  • P1002887-01-E,
  • P1062387-00-B,
  • P1057981-00-B,
  • 1058273-03-F,
Info
Tools needed (prepare it) :
  • Rachet: 8, 10, 13, 18, 19, 21
  • Torx:
  • Isolation Measuring tool
  • Coolant flush toolset
  • Hydralic bench desk
  • Milwaukee aku tools
  • Hose Clamping Pinch / Locking Pliers and Clip Pliers
  • Parts: seal, ballbearings, stator rewinding, seal glue, brake cleaner, gearbox oil, industrial paper,
  • Halfshaft puller
  • LOCTITE EA3450
  • Oil Seal 3D Printed fitting tool (available here, .stp for Bamboo PETG)
Info
Repair operation steps
 1- Initially, the car needs to be prepared by conducting a thorough troubleshooting procedure to conclusively identify and confirm defects in the drive unit. Once the drive unit issue is confirmed, proceed with the vehicle preparation for high voltage disassembly
https://www.youtube.com/watch?v=8q_m4Sks3qY
 2- In the case where the car is completely unresponsive this could indicate stator fault, with no activity from the door handles...
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