The Xiaomi M365 and its Pro models have proven themselves to be reliable urban vehicles, but even they have mechanical and electrical problems. Most often, problems arise in the field of motor wheels: there are extraneous noises, knocks, power drops or the wheel stops rotating at all. In such situations, the owner is faced with the question of whether to carry the device into service or try to fix the malfunction yourself. Disassembly of the rear motor wheel is a procedure of medium complexity, requiring accuracy, understanding the device of the unit and the presence of special tools.
Self-disassembly of the engine allows you not only to save a significant amount of money on the services of the service center, but also to conduct high-quality prevention. You can lubricate the bearings, clean the insides of moisture and dust, and visually assess the condition of the windings and magnets. However, it is worthwhile to understand that interference with the design of the engine removes the warranty if it has not expired. If you confidently hold a screwdriver in your hands and are ready to follow the instructions, this article will become your detailed guide.
Mishandling this element can lead to a short circuit or a chain break, and there may be neodymium magnets inside, which, if assembled in a careless manner, can cause injury to the fingers or split upon impact, preparation for the process must be thorough, and the workplace must be clean and well-lit.
Tools and workplace preparation required
Before you start dismantling, you need to assemble all the tools you need. The absence of even one specialized item can turn a simple process into hours of pain or damage to parts. The main tool for working with the rotor mount is a special remover, which often comes with a scooter or is sold separately. Without it, removing the wheel without damaging the axle or thread is almost impossible.
You'll also need a set of high-quality hexagonal keys, including elongated versions, as some screws can be tightened with great effort and have the property of "fixing". To work with electrical connections, a soldering iron with a thin sting, solder and shrinkage is indispensable. Don't forget about the multimeter for subsequent diagnostics of the electrical circuit and verification of the integrity of the windings.
☑️ Checking disassembly readiness
Organize the workspace so that small parts like screws and washers don't get lost. It's recommended to use a magnetic tray or multiple containers with signatures for screws of different types. Light should fall evenly, without sharp shadows, so you can see the fine details of the wiring and the condition of the bearings. Having isopropyl alcohol and degreaser on hand will also be a plus for cleaning the contacts.
Wheel Dismantling and Primary Diagnosis
The process begins with the power cut off from the scooter, flip the device over or securely lock it upright, first step, remove the charge port cover and disconnect the connector from the motor to the controller, which is a critical step, because you can't run electrically under voltage, and then you can start the mechanical part.
Using a hexagonal key, unscrew the screws that hold the brake disc stopper (if your model has one) and the engine cover. Be careful not to lose the small washers. Then you need to loosen the axle nuts, but not remove them completely. At this point, a special detacher comes in and screws into the threaded holes on the inside of the rotor.
⚠️ Attention: When screwing a tenant, act gradually, alternating sides. A sharp force on one side can skew the axle or tear the thread, leading to expensive repairs.
Once the wheel is removed from the frame, perform a primary visual diagnosis. Rotate the wheel with your hand, listening to foreign sounds. Luft shaft indicates wear of bearings, and a characteristic hum may indicate problems with the winding or magnets. Check the integrity of the phase wire at the exit point of the axis, which is the most vulnerable place where the fracture veins often occur.
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Before disassembling completely, take a photo of the location of all the wires and connectors, which will help to avoid errors in the reverse assembly, when the same-looking contacts will need to be connected in the right order.
Disassembly of the stator and rotor: technical nuances
When the wheel is removed, the most important step is to separate the stator and the rotor. In the design of the Xiaomi M365, these parts fit tightly together. They often require gently to separate them with a plastic blade in several places around the perimeter. Metal tools are best avoided so as not to damage the lacquer coating of the winding or the surface of the magnets.
Inside, you'll see a copper-coiled stator and a rotor with powerful magnets. Pay attention to the condition of the insulating gaskets. If moisture gets inside the motor, there may be traces of oxidation or rust. Carefully inspect the winding for blackening or mechanical damage. Any change in copper color may indicate overheating or short circuit.
Special attention should be paid to the passage of the phase wire through the hollow axis. In some models, the wire will simply pass through the hole, in others it will be fixed with a sealant. In reverse assembly, it is extremely important not to squeeze this wire, since the insulation on it is thin and easily damaged by the sharp edges of the metal. Cambrick or additional shrinkage is often used to protect the wire.
Why is the engine jamming?
Bearing replacement and maintenance of the mechanical part
The main source of noise in the motor wheel is the failed bearings. Xiaomi electric scooters usually use bearings of 6004 or 6005 size (depending on the modification and the year of release). These will require a lifter bearings or neat knocking out the old part with a mandrel and a hammer. The new part must be pressed strictly on the inner ring, so as not to damage the ball bearing assembly.
Before installing new bearings, it is recommended to carefully clean the seats in the rotor housing and on the stator shaft of old lubricants, dirt and oxides. Use a degreaser and rags. New bearings often come with conservation lubricant, which may be too thick for high-speed electric scooter speeds. The optimal solution is to replace the lubricant with high-speed lithium or specialty for electric motors.
When assembling a mechanical part, it is important to observe the timing of the puff. Too strong a puff can deform the bearing clip, which will cause it to quickly fail and become a backlash. Too weak will cause the wheel to beat. After installation, check the free rotation of the rotor: it should spin easily, with a slight noise of air, but without knocking and jamming.
| Component | Type size (example) | Indicators of wear | Recommended action |
| :--- | :--- | :--- |--- |
| Front bearing | 6004-2RS | Whistling, rotating | Replacement + lubricant |
| Rear bearing | 6004-2RS | Knock, back axle | Replacement + lubricant |
| Saline axle | Rubber | Oil traces, dust inside | Replacement |
| Phase wire | Copper multi-core | Break, short circuit | soldering, insulation |
Diagnostics of electrical circuit and windings
If the mechanical part is working, but the engine is not working or is working in jerks, the problem lies in the electrician. The first thing you need to "ring" the stator windings with a multimeter in the resistance mode. The normal phase resistance for the Xiaomi M365 is about 0.2-0.5 Ohms. Values should be the same for all three phases. The range of values indicates an interturn circuit or a cliff.
You also need to check the insulation. One multimeter probe is placed on the phase contact, the other on the metal stator housing. The device must show infinity (one in the higher discharge). If the multimeter shows any resistance, then there is a break on the body, which is dangerous for the user and the controller, in which case you need to rewind the motor or replace it.
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The resistance equality of all three phases is a major indicator of the health of the winding, and a difference of more than 10% indicates a malfunction that cannot be ignored.
Pay special attention to the soldering points of the wires to the contact plates inside the motor. Vibration can crack the solder, creating bad contact. This leads to sparking, heating and eventual chain break. If you find such defects, the soldering site should be warmed up, add some fresh solder and make sure the connection is reliable. Remember to isolate the restored areas with thermal shrinkage.
Assembly, sealing and final tests
The assembly of the motor-wheel is done in reverse order, but with a number of important rules. Before connecting the halves of the rotor and stator, make sure that there are no foreign objects, pile or dust inside. The edge of the body is recommended to be treated with a sealant to increase moisture protection, since Xiaomi's regular protection does not always cope with puddles and rain. Use a heat-resistant sealant that does not lose elasticity over time.
When you install the phase wire through the axle, make sure it's not stretched and has a small range, but does not hang inside. Often, a little silicone sealant is added to the axle hole to fix the wire and prevent moisture from entering. The screws of the motor cover must be tightened cross-cross, gradually increasing the force to ensure that the parts fit evenly.
After you're fully assembled, take your time to put the scooter on the pavement. Lift it up, turn on the power and check the engine for hearing and vibration. Light humming is normal, but there should be no knocking, grinding or burning. Scroll the wheel manually, it should rotate freely. Only after passing these tests can you start full operation.