Disassembly of the motor-wheel of the Xiaomi scooter: detailed instructions for models M365, Pro, 1S 4 Pro

Why to disassemble the motor wheel and when it is really necessary

The motor wheel is the heart of Xiaomi's electric scooter, and it's not required to be disassembled in every case of a breakdown. Most often, owners prematurely interfere with the design, risking damage to the winding, bearings or Hall sensors. Before you take on the screwdriver, make sure that the problem really lies inside the wheel, not in the controller, battery or wiring.

Typical symptoms in which disassembly is justified: uneven crunch during rotation (wear bearings), jerking or twitching at low speeds (problems with Hall sensors), full stop of the motor when the controller is running (winding break or short circuit). If the scooter simply does not turn on, first check the power on the controller and the state of the battery with a multimeter.

Xiaomi models M365, Pro, 1S and 4 Pro have a similar design of the motor-wheel, but there are nuances: M365/Pro — classical 36 magnets and sensors of the Hall on the stator; 1S/4 Pro – reinforced bearings and modified rotor geometry for better heat removal.

In this instruction, we will consider the universal method of disassembly, but the Xiaomi 4 Pro will require a special sender for the locking ring when assembled - without it, the risk of damaging the shaft thread.

Preparation: security tools and measures

To disassemble the Xiaomi motor wheel you will need: specialized tools (their absence is the main cause of breakdowns during self-repair).

Do not try to do with the "improvised means" - this will lead to the breakdown of the edges on the bolts or deformation of the body.

• 🔧 End key 10 mm (for attaching the wheel to the fork)
• 🔧 Hexagon 2.5 mm (for engine cover bolts)
• 🔧 The sleeves of the sleeves (required for the 1S/4 Pro)
• 🔧 Hammer and wooden expanse (for bearings pressing)
• 🔧 60W soldering iron (if Hall sensors need to be replaced)
• 🔧 Tester (multimeter) for checking windings
• 🔧 Silicone lubricant (for bearings, do not use) WD-40!)

⚠️ Warning: Work with rubber gloves – magnets in the rotor can pinch the skin if handled carelessly. Also avoid metal objects near the disassembled motor: magnets attract them with a force that can damage the winding.

Before the start of the work:

1. completely discharge the battery of the scooter (to avoid short circuit).

2. Remove the wheel from the fork by disconnecting the signal wires of the Hall sensors and the power cable (usually black, red and green).

3. Mark the wires with a marker - the confused phase will lead to incorrect operation of the motor.

Step 1: Remove the engine cover and access the insides

Start by removing the protective cover at the end of the wheel, which is mounted on 3-4 bolts under a 2.5 mm hexagon. Be careful: bolts often get stuck due to corrosion, and excessive force can tear the edges.

1. Apply a penetrating lubricant (like Liquid Wrench) and wait 10 minutes.
2. Use a screwdriver with a six-sided bat.
3. In extreme cases, drill the bolt with a 2.0 mm drill and cut the new thread.

After removing the cover, you will see:

- Stator (fixed part with windings).

- Rotor (rotating part with magnets).

- Hall sensors (3 pieces, fixed to the stator).

- Bearings (usually) 6004-2RS or 6204-2RS).

At this stage, don't try to pull out the rotor right away - it's locked in a locking ring. M365/Pro The ring can be fitted with a flat screwdriver, but 1S/4 If the ring is bent or deformed, replace it with a new one: MR1208 most models).

Step 2: Rotor Dismantling and Magnet Diagnostics

Once the lock ring is removed, carefully remove the rotor. It can stick to the bearings -- don't knock the shaft with a hammer!

1. Put the lubricant on. WD-40 shaft-bearing.
2. Use a removable or two carob keys as levers, putting them in the end of the shaft.
3. If the rotor does not move, heat the engine body with a building hair dryer (not higher than 80).°C) - this will expand the bearing.

Examine the rotor for:

Cracks on magnets (lead to imbalance and vibrations).

- Skolov on the shaft (may damage the gums).

Corrosion (especially in scooters operated in the rain).

⚠️ Warning: If the magnets are chipped or crumbled, don't try to stick them - this will upset the balance. MD-YN-001 for M365/Pro).

Check the gap between the magnets and the stator, which should be the same around the perimeter. If the gap is uneven, this indicates wear on the bearings or deformation of the shaft, in which case replacement bearings will be required (see next section).

Step 3: Replacing Bearings – a step-by-step process

Bearings are the weakest link in Xiaomi’s motor wheel, with a lifespan of 10,000 to 15,000 kilometers, but wear accelerates 2-3 times when driving on wet roads or sand.

- A hum or a squeak when the wheel is rotating.

- Luft shaft (checked by swaying the rotor in the radial direction).

- Overheating of the wheel after the trip (norm: up to 50)°C, critical temperature: over 70°C).

To replace bearings, follow the following steps:

For Xiaomi. M365/Pro bearings are fine 6004-2RS (size 20×42×12 mm), for 1S/4 Pro — 6204-2RS (20×47×14 Buy bearings with a double seal (marking) 2RS) — They are better protected from dust and moisture.

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Heat them in hot water before installing new bearings (60–70)°C) – this will facilitate pressing and prevent deformation of the osteums.

Step 4: Checking and Replacing Hall Sensors

Hall's sensors are responsible for synchronizing the rotation of the rotor with the current on the windings, and their failure manifests itself as:

- Punch at the start (the scooter "twitches" from the spot).

- Power loss at high speeds.

- Mistake «E014» or «E015» on display (for Pro/1S/4 Pro).

To check the sensors:

1. Solder them off the charge (remember the location of the wires!).

2. Call the multimeter in diode vertebrae mode:

- Resistance between the feed wire (+5V) land (GND) must be infinite.

The resistance between the signal wire and the ground is within 10-20 kOhm.

If the sensor is defective, replace it with a similar one (for example, A3144 or SS41). When soldering, use low-temperature solder (not higher than 250).°C, so as not to damage the charge:

• 🔧 Check the polarity of the connection (tangled wires will disable the controller).
• 🔧 Make sure the sensors are rigidly fixed – vibration will lead to false positives.
• 🔧 Adjust the gap between the sensor and the magnet (optimum: 1-1.5 mm).

Step 5: Motor wheel assembly and testing

The assembly is carried out in reverse order, but there are critical points:

1. Grease the bearings with silicone lubricant (not litho!).

2. Check the centering of the rotor - it should not catch the stator.

3. Tighten the bolts of the cover cross-cross with a force of 2.5 N·m (the groove deforms the body).

Once assembled, don't connect the motor to the controller immediately.

1. Scroll the wheel manually - it should rotate smoothly, without jamming.
2. Check the resistance of the windings with a multimeter (should coincide with the initial values).
3. Connect the motor to the controller and start the scooter in test mode (no load, hanging the wheel).

⚠️ Warning: If the scooter doesn't reach full speed or the wheel is warming up after assembly, you've probably confused the winding phases, turn off the power, and swap any two power wires (e.g., green and yellow).

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The main mistake in assembly is the wrong installation of the locking ring, and if it does not fix the shaft, the rotor will shift when loaded and destroy the bearings in 100-200 km.

Common Mistakes and How to Avoid Them

Even experienced craftsmen make mistakes when disassembling the Xiaomi motor wheel.

• 🔧 Use of the WD-40 bearing-grease → They will corrosion in 1-2 months. Use only silicone lubricant.
• 🔧 Hammer strikes on the rotor shaft → It deforms the shaft and the osteometers. Always use a soft spacer.
• 🔧 Overheating when soldering Hall sensors → It destroys the board.
• 🔧 Ignoring the backing of bearings → causes the windings to collapse due to rotor beating.

If you are faced with an atypical breakdown (for example, a winding break or a crack in the body), evaluate the feasibility of repair. MD-YN-002 for M365) It'll cost 3,500 to 5,000. ₽, while major repairs with replacement of windings - in 6000-8000 ₽.

For models Xiaomi 4 Pro with a regenerative braking system, self-repair is not recommended - you need to flash the controller after replacing the Hall sensors.

FAQ: Frequent questions about the dismantling of the Xiaomi motor wheel