The Xiaomi Mi Scooter 1S has proven to be a reliable vehicle, but even the most durable equipment requires maintenance. Most often, owners face the need to access the rear wheel when cameras puncture, tread wear or overtaking problems. Proper dismantling of the unit is the first and most important step to successful repairs that avoid damage to electrical components.
The process of removing the wheel differs from the first generation models in the presence of additional sensors and modified design of the locking elements. Sloppy actions can lead to wiring breakage or damage to the tightness of the motor-wheel. In this article, we will discuss each step in detail, paying special attention to the safety and safety of the warranty of the device.
Before you start disassembling, you need to prepare the workplace, you need a flat surface with good lighting, where the scooter can be fixed in an inverted position, make sure you have access to electricity if you need to pump the camera after installation, and have all the necessary tools at hand.
Tools and workplace preparation required
For the quality of work on dismantling the rear wheel of the Xiaomi 1S model, a standard set of keys may not be enough. The design involves the use of specific heads and screwdrivers, which must be in perfect condition to avoid licking the edges of the bolts. Lack of the right tool often leads to increased repair time and risk of damage to the thread.
Special attention should be paid to the state of the bits and keys. If you use a cheap tool, the risk of tearing the screws on the screws increases significantly, especially given that in the factory they are often planted on a fixing varnish.
- 🔧 Set of hexagonal keys (mandatory 4 mm, 5 mm and 8 mm)
- 🪛 Cross screwdriver PH2 magnetically tipped
- 🔨 Plastic blade or mediator for opening plugs
- 🧤 Working gloves to protect hands from sharp edges
⚠️ Warning: Before starting any work, be sure to turn off the scooter through the application or by holding the power button. Working with electrical components under voltage can lead to a short circuit of the controller.
Organize the space so that small screws don't get lost, and it's recommended that you use a magnetic tray or arrange the fastener in order on a sheet of paper with notes, which will simplify the process of reverse assembly and eliminate the appearance of "extra" parts at the end of the repair.
Dismantling decorative elements and hub cover
The first step is to remove the plastic linings that hide the fasteners. On the Mijia Electric Scooter 1S, the hub lid is tight enough and requires careful handling. You should not use excessive force, since the plastic can crack when you squirm.
Use a plastic blade to fit the edges of the plug. Move around the perimeter, gradually releasing the latches. Inside, you'll find screws that hold not only the lid, but also the position of the reflector and the wiring elements. The reflector is often glued or screwed, and you have to remove it to gain full access to the hub.
Once the outer cover is removed, you will have access to the internal screws of the brake disc mount and the motor protective cover, and it is important not to confuse the length of the screws when reassembled, since they can differ by fractions of a millimeter, which is critical for tight fit.
Disconnection of electrical connectors and wiring
The most critical part of the process is to turn off the motor phase wires, and unlike mechanical junctions, the electrical junctions require increased attention, and the wiring is approached by a special hole in the frame and closed by a protective sleeve.
You have to remove the protective cover that covers the contacts, which is usually held on a few screws or latches, and inside you'll see a connector connecting the motor windings to the controller, and the connector can be tightly latched, so you have to pull on the connector body, not the wires themselves.
When you disconnect the wires, remember or photograph the color markings. Although it is difficult to confuse the phases in the three-pin connector because of the shape of the keys, visual control is never superfluous. Also check the insulation status of the wires for cracks or melts.
- 📸 Take a photo of the connection before disconnecting
- 🔌 Pull only for the plastic case connector
- 🚫 Do not pull the wires sharply so as not to damage the soldering inside
⚠️ Note: It is strictly forbidden to close the contacts of phase wires between themselves or on the frame. This can disable the controller even when the scooter is turned off due to the residual charge in the capacitors.
After the electrics are turned off, make sure that the wires do not interfere with further removal of the wheel. They can be carefully sidelined or temporarily fixed with tape on the frame so that they do not fall into the rotation zone or are not pressed with the fastener.
Removal of brake disc and mechanical fixtures
The brake disc on Xiaomi 1S is attached to the hub of the wheel with several screws. To unscrew them, you will need a key of the appropriate size, usually a hexagon. The screws can be tightened with great force and fixed with a threaded lock.
If the screws don't unscrew, don't put too much effort right away. You can try to warm the screw hats slightly, or use penetrating lubricant to give it time to act. A sharp effort can cause the threads in the hub aluminum to break down, which requires complex repair.
Once the brake disc is removed, unscrew the wheel axis nut, which is on the opposite side of the brake disc, and it's the most convenient way to do that is to use the end head with the collar, and the nut can also be legitimized, so it takes a lot of effort to break off.
It's important to note that the brake disc needs to be removed carefully so it doesn't deform, and even a minimal bending of the disc will cause the brakes to beat and make it creak unpleasant when you're in operation, and you'll have to put the disc on a flat surface with your face up.
The process of removing the wheel from the frame
When all the fasteners are loose, there's a time when you physically remove the wheel, and the wheel is very heavy, so you have to be confident, hold the wheel with one hand, and then you have to unscrew the wheel with the other, or you have to knock it out.
The axle can come out tight because of the density of the bearings. Light tapping of the rubber yang on the axis (not on the wheel itself!) will help move it from place. The main thing is not to damage the thread on the ends of the axis and not to deform the dropout frame.
When you remove the wheel, watch for washers and bushings that can be located on the axle. Often on the inside there is a special washer-grover or remote sleeve to prevent backlash, and losing this element will lead to rapid wear of the bearings.
| Component | Type of attachment | Tool. | Moment of puffing (Nm) |
|---|---|---|---|
| Brake disc | M5 screws | Hexagon 4 mm | 4-5 |
| Axis nut | M10 nut | Head 17 mm | 20-25 |
| Hub cover | Screws. | Cross screwdriver | 1-2 |
| Reflector | Screws/Glue | Hexagon 3 mm | - |
After successfully removing the wheel, inspect the seats in the frame. There should be no bullies, dirt or corrosion. If necessary, clean and lubricate the contact surfaces before re-installation, so that the wheel sits smoothly.
Typical errors and precautions
One of the most common mistakes is to ignore the wiring state when you remove the wheel. The motor-wheel wires go through the hollow axis, and if you pull the wheel gently, you can pull them to tear. Always leave a margin of length and control tension.
Another mistake is the loss of small parts. The brake disc mount screws are very small and can easily roll under the workbench or into the slot. Use a magnetic tray or container with compartments to sort the fastener by disassembly steps.
Also, don't forget about the safety of lithium batteries, although when removing the wheel, direct contact with the cells is minimal, but damage to the insulation of the motor wires can lead to a short circuit on the frame, which is dangerous when you turn on later.
⚠️ Warning: When reassembling, do not pull over the brake disc screws. Excessive tightening moment can lead to deformation of the seat or failure of the thread in the aluminum hub.
It is also important to properly install the anthers and protective cuffs, and if they get crooked or damaged, water and dirt will start to enter the engine and bearings, which will significantly reduce the life of the unit.
Service and assembly recommendations
The assembly is done in reverse order, but with a few important nuances: Before installing the wheel, clean the axle and bearings of old lubrication and dirt, and it is recommended to apply new lubrication to the bearings and the axle surface to prevent corrosion.
When you install the brake disc, make sure it's up straight and doesn't hit the pads. If the disc is new, you might need a little lapping. The wheel rotation test, it should be easy to spin, without jamming or any extraneous sounds.
The final step is to check the electrical connections, make sure that the connector is snapped to the characteristic click, and the wires are laid in their channels and do not rub against moving parts, only after careful check can you turn on the scooter and conduct a test run.