The maintenance of the Bafang mid-motor takes about 1h and is very simple. No special tools are required. You only need 2 different Allen key attachments (to remove the housing cover, controller and stator), as well as a flathead screwdriver. If the seals are damaged during maintenance, they should be replaced. We recommend that you keep 1 set of motor gaskets in reserve. Below the blog we have linked the gaskets - separated by BBSHD and BBS01/02 - (see "Matching articles"). To maintain the engine, you also need conventional gear grease (do not use oil!), silicone, and a special grease for the nylon gear. We use Mobilgrease 28, which is also available in our webshop.
As you can see in the video above, maintenance essentially consists of 4 steps:
Unscrew the housing cover, dismantle the controller, remove the silicone and seals (caution: do not damage the cable in the process) and then remove the stator; Now, in addition, the housing can be cleaned in the area of the controller and the silicone residues can be thoroughly removed.
2) Lubricate the nylon gear:
Grease the nylon gear wheel with Mobilgrease 28 (caution: do not use conventional grease!) and reassemble the motor core. Before doing this, check the seal between the stator and the housing again for damage and replace it if necessary.
3) Insert seals:
Fit (new) phase seals, check rubber seal between controller and housing for damage and replace if necessary, reconnect 5 plug connections between stator and controller (firmly) and sufficiently siliconise in the area of the seals, then the controller can be mounted on the housing again using the 3 screws. Make sure that the outer rubber seal is not displaced when tightening the screws. In addition, pay attention to the cables inside (do not use force).
4) Lubricate the gearbox:
Now grease both the large gearbox and the Pinion Gear with conventional gearbox grease. Again, check the seal for damage and replace it if necessary. Finally, insert the axle into the housing and mount the gearbox cover. Do not apply too much force (if necessary, turn the pinion gear a little so that the gearing adapts to the large gear).
Basically, maintenance also works if the housing cover is unscrewed only after the controller has been mounted (after step 3) and the gearbox is greased. The maintenance of the Bafang BBS01 and BBS02 motor works the same way. The only difference is in the area of the housing cover. This is made of plastic and must be unscrewed before dismantling the controller.
>>> When is engine maintenance necessary or how often should it be done?
We recommend servicing the engine once a year. If the noises of the motor sound very rough, then at least the large gear should be greased. In normal operation, without noticeable noises, annual maintenance and lubrication of the centre motor is sufficient.
After the maintenance procedure, we recommend that you clean your motor with a damp cloth and check the cables for damage.