Removal of the rear wheel on the Xiaomi Pro 2: disassembly without damage

The Xiaomi M365 Pro 2 is a popular model among urban dwellers, but even such a reliable device wears out tires, bearings or requires replacement of brake pads. Removing the rear wheel is one of the most popular procedures for self-repair, but without knowledge of the nuances of design, you can damage the electrical wiring, gearbox or even control unit. In this article, we will analyze the process by steps, specify the necessary tools and warn against the typical mistakes that beginners make.

The Pro 2 features an integrated rear-wheel motor, where the power wires and Hall sensors pass through the axle, which means that simply pulling the wheel off like a bicycle doesn't work, you need to be accurate and understand the circuitry. If you've never done electrical repair, we recommend that you first review the frequent questions at the end of the article, where you'll get to the bottom of the complexities.

Preparation: security tools and measures

Before you start dismantling, make sure you have everything you need. Not even one key can turn a simple procedure into hours of torture. Here is the minimum set of tools for removing the rear wheel on the Xiaomi Pro 2:

• 🔧 End key 14 mm (for the axis nut) - necessarily deep, as the standard may not reach the nut.
• 🔧 Hexagon 5 mm (for fastening the brake disc and the engine cover).
• 🔧 Flat screwdriver (for tweaking the lid of the controller or wire lockers).
• 🔧 Flat-slippers (to remove the locking rings, if you need to disassemble the engine).
• 🧴 WD-40 or similar lubrication (if the axis nut is boiled).
• 📦 Plastic container for small parts (screws, washers, stoppers).

Also, prepare the workplace: the scooter should stand on a flat surface, it is advisable to fix the front wheel so that it does not fall during operation. In no case do not put the scooter on its side - this can lead to the grease from the motor hitting the brake disc or sensors. It is best to use a bicycle rack or hang the back on a hook.

⚠️ Warning: Before starting work, completely discharge the battery (up to 0%) or disconnect it from the controller. In the Pro 2 motor-wheel, even when the scooter is turned off, there is a voltage on the wires, which can lead to a short circuit when the contacts are accidentally grazed.

Step 1: Removal of brake disc and motor cover

The first thing you need to do is to free up the wheel axle nut.

1. Unscrew two 5mm hexagon screws that attach the brake disc to the wheel hub.The screws can be tightened strongly - don't put excessive effort to avoid tearing the thread.
2. Take the brake disc off and put it aside. Be careful, it's sharp, you might get hurt.
3. Put a flat screwdriver on the plastic engine cover. The lid is held on the latches, so be careful not to break them. On the Pro 2, the lid often sticks -- if it doesn't, slightly heat it with a hairdryer (no higher than 60°C).

Once you remove the lid, you'll see three wires coming from the motor to the controller: two thick wires (power) and one thin wire (Hall sensor) that you can't pull or twist, which can tear the contacts off the motor board. If the wires get in the way, carefully bend them aside with tape.

Step 2: Disconnect motor wires from controller

This is the most important step. On the Xiaomi Pro 2, the motor wires are connected to the controller via the JST-XH 3-pin connector.

1. Find the connector on the controller (usually located under the platform of the scooter, closer to the rear wheel).
2. Carefully press the plastic locker of the connector and pull it up. Don't pull the wires, just the connector itself!
3. If the connector is not amenable, check if there are any additional latches or glue, and some Pro 2 batches have the connector glued to protect against vibration.

Once the wires are disconnected, seal them (e.g., wrap the ends in a seal) to avoid short circuits. If you plan to keep the wheel from resetting for a long time, you can temporarily connect the motor wires (thick separately, thin separately) to each other so that they do not hang around.

⚠️ Attention: Some Pro 2 versions have Hall sensor wires running separately, so if you see two connectors instead of one, take a picture of their location before you turn them off, and when you build them back, it's easy to confuse polarity.

Step 3: Untwisting the axle nut and removing the wheel

Now that the wires are disconnected, you can start to dismantle the wheel, and the key here is not to damage the thread or lose the little parts.

1. Put the end key 14 mm on the axis nut. If the nut fails, spray it with WD-40 and wait 5-10 minutes.
2. Unscrew the nut counterclockwise. The Pro 2 uses a left-handed thread, so if the nut doesn't go, try to spin backwards.
3. After removing the nut, remove the puck and the locking ring (if any). Carefully pull the wheel on yourself - it should come off the axle.

If the wheel doesn't come off even after you unscrew the nut, don't hit it with a hammer!

• 🔨 Carefully tap on the axis through a wooden pad (for example, a hammer handle).
• 🔥 Heat the hub of the wheel with a hairdryer (not higher than 80).°C) to expand the metal.
• 🛠️ Use a bearing removable if the wheel is not at all amenable.

💡

If you remove the tire replacement wheel, check the bearings before installing the new rubber. On the Pro 2, they often wear out after 3,000 to 5,000 km, leading to backlash and vibrations.

Common Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when disassembling the Xiaomi Pro 2, and here are the most common ones and ways to prevent them:

Another common problem is that the rubber seal between the engine lid and the hub is damaged, and if the seal breaks, moisture and dirt will enter the engine, leading to corrosion and failure, and when you build it back, check its integrity and replace it if necessary (sealer catalog number for Pro 2 - XM-005-R).

💡

If the scooter doesn't drive or twitch after assembly, 90 percent of the time the problem is that the Hall sensor is not connected correctly.

Reverse Assembly: nuances and verification

Putting the wheel back in requires as much attention as dismantling.

1. Before installing the wheel, lubricate the axle with a special bearing lubricant (e.g. Liqui Moly LM 50). Don't use solidol or litol - they collect dirt.
2. Make sure the locking ring is still in place, and without it, the wheel can jump off while driving.
3. Tighten the axis nut with a force of 40-50 N·m. You do not need to pull - this will damage the bearings.
4. Connect the motor connectors to the final tightening of the nut - it is easier to check whether the wires are twisted.

After assembly, be sure to perform the test:

1. Turn on the scooter and check if the wheel rotates freely (without jamming).
2. Drive 5-10 meters at the minimum speed, listening to outside sounds (creaking, knocking).
3. Check the brake operation - if the disc is curved, the braking will be uneven.

⚠️ Note: If the scooter does not turn on after assembly or gives an error E014 (Motor malfunction, you're probably confused by Hall's sensor wires, disconnect the battery and check the connector connection.

When to contact the service: signs of serious problems

Not all breakdowns can be repaired on their own, but here are some cases where you can trust the professionals:

• 🔋 Short circuit in the engine (sparks, the smell of burning, melted wires).
• 🛠️ Axis thread damage - if the nut is scrolling or not wound.
• 📉 Strong backing of bearings (wheel "dangling" from side to side).
• 💻 Controller errors (E010, E012), which do not disappear after checking the wires.

The cost of repairing the rear wheel in the service for Xiaomi Pro 2 varies from 1,500 to 4000 rubles, depending on the problem. For example, replacing bearings will cost ~ 2000 rubles, and rewinding the engine - up to 3,500 rubles. If you are not sure of your abilities, it is better not to risk: improper repair can lead to fire danger (lithium-ion batteries of scooters are prone to fire with short circuits).

FAQ: Frequent questions about removing the wheel on Xiaomi Pro 2