How to remove the front wheel from the robot vacuum cleaner Xiaomi: disassembly without errors

The front wheel of Xiaomi's robot vacuum cleaner is one of the most vulnerable parts, and it takes the brunt of the manoeuvring load, bumps into obstacles, and wears out over time. If your vacuum cleaner starts to peck, creak, or stops moving forward, the problem is probably the front wheel, but how do you remove it without breaking the plastic latches or sensors?

In this article, we will discuss step-by-step instructions for Mi Robot Vacuum, Viomi models. V2/V3, Dreame D9 And we'll also tell you what tools you'll need, how to avoid the typical disassembly errors, and what to do if the wheel is stuck to the axle, and why you can't just pull the wheel with force, which can cause a drop or turn sensor to break.

If you've never been a tech expert before, don't worry: Xiaomi's front wheel design is designed to be unskilled, and the key is to be careful and follow our guidelines. We added a photo of key steps and a video at the end of the article to make it clear.

Reasons why you need to remove the front wheel

The front wheel of a robot vacuum cleaner is not just a support, but part of a complex mechanical system, and its breakdown can manifest itself in different ways, and the problem is not always obvious.

• 🔊 Screaming or extraneous sounds when moving – often caused by dirt hitting the bearing or wear of the rubber rim.
• 🚫 The vacuum cleaner does not travel forward, only spins in place - it is possible to block the wheel due to deformation or breakage of the axis.
• 📉 «Sitting down the nose, the wheel falls down, and the vacuum cleaner clings to the carpets.
• 🔄 Incorrect operation of the drop sensor – if the robot “thinks” that hangs down the stairs, although it stands on a flat surface.
• 💦 Traces of rust or corrosion on the axle - relevant for vacuum cleaners that were operated in wet rooms.

Sometimes the wheel may seem to be working, but when diagnosed through the Mi Home app, errors such as Error 10 (problem with the motion sensor) or Error 12 (wheel lock) are detected, in which cases disassembling and cleaning the mechanism often solves the problem without replacing parts.

Note that if the Xiaomi vacuum cleaner started to fall from a height to its side, the problem may not be in the wheel, but in the gyroscope or accelerometer, in which case a deeper diagnosis will be required.

Preparation: security tools and measures

Before you start disassembling, make sure you have everything you need.

• 🔧 Plastic blade or mediator - for careful slapping of latches (metal screwdrivers can scratch the body).
• 🔩 Cross screwdriver (PH0 or PH1) — for wheel attachment screws (size depends on model).
• 🧲 Magnetic mat or bowl - so as not to lose small details (springs, washers).
• 🧴 Alcohol or contact cleaner – for axis treatment and rust removal.
• 📸 Smartphone for photography – fix the location of parts before disassembling!

Important: Before starting work, completely discharge the vacuum cleaner (leave it on until it automatically shuts down) to prevent the engines from accidentally turning on during disassembly, and disconnect the vacuum cleaner from the Mi Home app to avoid conflicts when reconnecting.

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If the wheel is stuck to the axle, don't try to pull it with force - it can break the plastic case of the sensor. WD-40 or silicone lubrication on the axle and wait 10-15 minutes.

For models with a laser rangefinder (for example, Mi Robot Vacuum-Mop 2 Pro), be careful: when disassembling the front part, you can accidentally move the LiDAR lens, which will lead to mapping errors. If you are not sure about yourself, you should contact the service.

Step-by-step: how to remove the front wheel

The disassembly process may vary slightly depending on the model, but the overall scheme is the same for most Xiaomi robot vacuum cleaners. 2C.

Step 1: Turn the vacuum cleaner over and remove the bottom cover

Carefully turn the vacuum cleaner upside down and place it on a soft surface (a towel or rubber mat). Press two latches on the sides of the bottom cover (usually with the front wheel) and pull the lid on itself. It should be removed effortlessly.

Disconnect the vacuum cleaner from the power supply and application

Turn the robot over to a soft surface

Photograph the location of the details

Prepare tools and containers for small parts

Treat the wheel axis with lubrication (if it is jammed)-->

Step 2: Disconnect the drop sensor connector

Under the lid, you'll see a wire with a connector going from the front wheel to the board. Gently unplug it by pulling the plastic tongue (don't pull the wires!). If the connector is "stuck," use a plastic blade to put it on the side.

Step 3: Unscrew the wheel mount screws

The wheel is mounted to the body with two or four screws (depending on the model). Unscrew them with a cross screwdriver and put them aside. Be careful: some models may have spring washers under the screws - don't lose them!

Step 4: Remove the wheel from the axle

Now the most important thing is that the wheel is sitting on a plastic or metal axis with slots, to remove it.

1. Carefully pull the wheel on yourself, swaying slightly from side to side.
2. If it does not lend itself, apply silicone lubrication to the axis and wait 5-10 minutes.
3. For stubborn wheels, pliers with soft sponges can be used, but do not squeeze too hard so as not to deform the plastic.

Step 5: Check the condition of the axis and bearing

After removing the wheel, check:

• 🔍 Axis - there should be no rust, burrs or backlash.
• 🌀 Bearing (if any) – it should rotate smoothly, without creaking.
• 🔄 Spring – it should not be stretched or deformed.

If the axle is bent or has traces of corrosion, it is better to replace it. The bearing can be cleaned with alcohol and lubricated with lithium lubricant (do not use it). WD-40 — it dries!).

Common Mistakes and How to Avoid Them

Even experienced users sometimes make mistakes when disassembling the front wheel, and here are the most common mistakes and their consequences:

Another common problem is the left and right wheels getting mixed up when they are reverse-assembled, and although they look the same, there may be differences in the location of the sensors inside, and if the vacuum cleaner is crooked or spinning in place after assembly, check if the wheels are properly installed.

Critical error: don't check the drop sensor after assembly. If the connector is not tightly connected, the vacuum cleaner can ignore the cliffs and fall down the stairs! Always test the robot on a safe surface before first starting.

Cleaning and lubrication: how to extend the life of the wheel

If the wheel is creaking or spinning tightly, don't be in a hurry to change it. Often, careful cleaning and lubrication are enough.

Cleaning of the axle and bearing

• 🧼 Wash the axle and wheel with warm soapy water (without aggressive detergents!).
• 🧴 Use vinegar or a special cleaner to remove rust (e.g. Liqui Moly Rostloser).
• 💨 Dry the parts with compressed air or a hair dryer (not hot!).

2. Bearing lubrication

Never use the wheel bearings to lubricate. WD-40, vegetable oil or solidol -- they attract dust and dry quickly:

• ⚙️ Silicone lubricant (e.g, CRC Silicone Lubricant – does not attract dirt, water repellent.
• 🛢️ Lithium lubricant (for example, Liqui Moly Lithofluid) - long lasts, withstands loads.
• 🔧 Special lubricant for bearings (e.g, SKF LGMT 2).

Apply the lubricant in a thin layer, the excess will lead to adhesion of dust. After the lubrication, scroll the wheel 10-15 times so that the lubrication is evenly distributed.

3. Spring check

The spring is responsible for the damping of the wheel, and if it's stretched or deformed, the wheel will fall through.

1. Remove the wheel and remove the spring.
2. Compare its length to the new one (the original spring for Xiaomi is long) ~25 mm in compressed condition).
3. If the spring has lost its elasticity, replace it (article — MDZ-09-03).

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Regular cleaning and lubrication of the front wheel every 3-6 months prolongs its service life by 2-3 times, especially for vacuum cleaners working on carpets or in dusty rooms.

When to replace the wheel: signs and articles

It's not always possible to fix the wheel, sometimes you need a full replacement, and it's a bad sign that it doesn't make sense to repair it.

• 🔄 Cracks or chips on the wheel body – even if it is still spinning, the plastic can split completely.
• 🌀 Luft axis more than 1-2 mm - indicates wear of the bearing or the axis itself.
• 💥 The wheel “crumbling” when removed – for example, the plastic gears inside fell off.
• 📵 The drop sensor doesn't work even after cleaning the contacts.

To replace the wheel on Xiaomi robot vacuum cleaners, original and compatible parts are suitable.

When buying parts, pay attention to the series of vacuum cleaners (it is indicated on the sticker under the lid). For example, the wheels from Mi Robot Vacuum-Mop P will not be suitable for the Mi Robot Vacuum-Mop 2 Pro, although they look similar.

Where to buy it?

• 🛒 Xiaomi official store (long delivery, but original warranty).
• 🌍 AliExpress (look for sellers with a rating above 98% and compatibility reviews).
• 🏬 Local service centers (often sell used parts in good condition).

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Before buying a wheel, check if a new spring and washers are included. Often sellers save and send only the "bare" wheel case, and the trifles have to be purchased separately.

Building and Testing: How to Avoid Making New Mistakes

It seems easier to assemble a vacuum cleaner after replacing or cleaning the wheel than to disassemble, but there are pitfalls here.

1. Set the wheel on the axle, making sure the grooves match.
2. Twisting the screws of the mount (do not pull over - the plastic can crack!).
3. Connect the drop sensor connector (should be a click!).
4. Set the bottom cover by snapping all the locks.

Post-assembly testing:

1. Check the smoothness of the wheel rotation manually - there should be no creaking or jamming.
2. Turn on the vacuum cleaner and test on a flat surface (it should go straight, without twisting).
3. Bring the vacuum cleaner to the edge of the table - it should stop (check the drop sensor).
4. Start cleaning in test mode (for example, around the perimeter of the room).

⚠️ Warning: If the vacuum cleaner is jerking or humming after assembly, it's probably a curved wheel or a skewed axle. Disassemble it again and check for symmetry!

If the vacuum cleaner starts to “glut” (for example, it goes in circles or does not see obstacles), reset the settings to the factory through the Mi Home app:

Device Profile → Settings → Resetting settings

This will help to reset sensor errors associated with disassembly.

FAQ: Answers to Frequent Questions