Bafang Ultra gear, the primary steel gear for Bafang Ultra M620 for replacement.

How to replace the Bafang M620 primary gear, please check below video:

Bafang Ultra Motor metal gear/bearings for replacement;

Bafang has upgraded the gear, it is metal gear rather than nylon gear. 

Two end bearings(6000RS) are 10mm inner diameter,  26mm outer diameter and 8mm in thickness;

The big steel gear is about 53mm in diameter; the small metal gear is about 27.5mm in diameter;

It's the third steel gear of the Bafang Ultra motor.

Bafang upgraded the M620 G510 rotor and the third gears this year to reduce the motor noise. The two rotors are the same with sizes; only the teeth are different; The two third steel gears are also different with teeth numbers, please check our pictures.  If your motor was sourced before 2023, then your motor would be with the old version rotor and the 3rd steel gear; if your motor was sourced this year, please check before ordering or buy the rotor and the 3rd gear together.  

If you want to reduce noice for your Bafang M620 motor, you can try to replace to the new rotor and the new third gear.

Bafang Ultra M620 /G510 middle steel gear for replacement

Bafang Ultra M620 G510 motor rotor with detecting sensor for replacement.

The two rotors are the same with sizes; only the teeth are different; The matching third gear for the rotor also changed in 2023;  If your motor was sourced before 2023, then your motor would be with the old version rotor and the 3rd steel gear; if your motor was sourced this year, please check before ordering or buy the rotor and the 3rd gear together.

How to take out the M620 rotor for replacement, please check below video(We will provide the tool for removeing the M620 rotor freely.):

Bafang M620 M600 M510 M500 M420 crank arm bolt/ screw;

Replacing the Bafang M620 UART controller, the motor may work abnormally(vibration, reverse running etc), you may need to calibrate the motor. 

This LCD with special firmware, can be used for calibrating the M620 UART motor after replacing the controller. 

This LCD can also work as a standard Bafang LCD display for the Bafang UART motors, please note. It is only used for UART motor calibration. It cannot work for CAN motors too.

For how to calibrate the M620 motor after replacing the controller, please check the pictures on the website or download from here: Bafang M620 UART motor calibration manuel

The calibration LCD is only for the controller version code number being "CR R10M.1000.SN.U 1.5". You can check the controller version number on the controller.

For how to calibrate the motor, you can view the video below:

Bafang Ultra M620 G510 motor pawl clutch, finger freewheel /ratchet wash for repair；

Bafang may have upgraded the pawl clutch. The height has little difference according to our customers' feedback. It's better for you to measure your original pawl clutch height before ordering. Our Bafang Ultra pawl freewheel is 15mm in height. If your motor is not yet openned, you can consider to order the whole Bafang Ultra reduction gear set including the pawl clutch, replacing the whole gear set is ok according to customer's feedback.

How to replace the M620 pawl clutch, please check the video below:

Bafang Ultra M620 eb-bus 1T4 cable; if your Ultra loom is broken, then this 1T4 harness would be suitable for you to replace.

There two types of Ultra M620 EB-BUS cable, one is with a triangle display connector and other other type is with a round display connector, please check your display connector before ordering the Bafang Ultra harness.

Total cable length is 1.5m.

Bafang Ultra M620 /G510 chainrings.

There are two types of Ultra M620 chainwheels: MTB chainring and Fatbike /snowbike chainring. The offsets for the two chain wheels are different.