How to remove the front wheel from the robot vacuum cleaner Xiaomi: instructions with nuances

Why would you need to remove the wheel?

The front wheel (or “roller”) of Xiaomi robot vacuum cleaners is one of the most vulnerable elements, it constantly contacts the surface, collects hair, threads and small debris, which leads to jamming or uneven wear.

First, to clean the machine of accumulated dirt, even with regular care inside the roller accumulate fibers that eventually block the rotation, and secondly, to replace worn parts: rubber coating is washed and plastic gears break. Thirdly, the removal of the wheel is necessary in the diagnosis of malfunctions when the vacuum cleaner moves in jerks, gnashes or refuses to go at all.

It is important to understand that the wheel design of different Xiaomi models (for example, Mi Robot Vacuum-Mop 2 Pro, Viomi V3 or Dreame D9) may differ, but the general principle of dismantling remains similar. If you have never understood the technique, do not be afraid - the process does not require special skills, but requires accuracy and patience.

Preparation: security tools and measures

Before you start removing the wheel, prepare everything you need.

• ✅ A flat screwdriver (better with a thin sting) - for licking the latches.
• ✅ Cross screwdriver (usually) PH0 or PH1) — screw-off.
• ✅ Tweezers or thin pliers - to extract small details.
• ✅ Napkins and alcohol - to clean the mechanism from dirt.
• ✅ Container for small screws - so as not to lose fasteners.

Also, take into account a few safety rules:

• ⚡ Disconnect the vacuum cleaner from the charging station and remove the battery (if possible!
• 🧹 Clean the case of dust so that dirt does not get inside the mechanism during disassembly.
• 📸 Take a picture of each stage, it will help to get everything back together.

⚠️ Warning: Do not use metal objects (knives, scissors) to tweak plastic parts - this will lead to chips and cracks. If the latch does not respond, try to heat the plastic with a hairdryer (no higher than 60).°C) to make it more elastic.

Step 1: Dismantling the wheel cover

The first step is to remove the outer casing that covers the wheel mechanism, which is mounted on the latches in most Xiaomi models, carefully insert a flat screwdriver into the gap between the casing and the vacuum cleaner body (usually closer to the front of the wheel), and gently tuck it in.

Don't put too much effort -- the plastic is fragile! If the casing isn't removed, check if there are any hidden screws. For example, in the Viomi V3, you sometimes have an extra screw under the sticker. Once you remove the casing, you'll see the internal mechanism: gears, the axis of rotation and the fasteners.

In some models (like the Dreame D9), the casing may be part of a single bumper, in which case you have to first remove the front bumper by flicking it around the perimeter. Be careful - sensor wires go inside the bumper, they can not be damaged!

Step 2: Unscrewing the fasteners

When you remove the casing, you'll see the fasteners holding the wheel, and the number depends on the model.

• 🔧 Mi Robot Vacuum-Mop 2 Pro – usually 2-3 screws.
• 🔧 Viomi V3 — 4 screws (two front, two back).
• 🔧 Dreame D9 — 3 screws + side-latch.

Use a cross screwdriver of the right size. The screws in Xiaomi robot vacuum cleaners often have custom threads - don't pull them back when you build them, otherwise you can rip them off! If the screw doesn't unscrew, drop a little WD-40 on it and wait 5-10 minutes.

Once the screws are unscrewed, the wheel is still on the axle, and you're going to pull it gently, while you're swaying it from side to side, and if the wheel doesn't respond, make sure there are any hidden latches or locks.

⚠️ Note: In models with wet cleaning function (for example, Mi Robot Vacuum-Mop P), a humidity sensor may be under the wheel. Don't pull the wheel by force - first disconnect the sensor connector!

Step 3: Removing the axis and gears

When the wheel is removed from the body, you'll see the spin axis and gears transmitting torque from the motor. In most Xiaomi models, the axis is fixed by a lock ring or a washer.

1. Remove the locking ring with tweezers (carefully, it is easily lost!).
2. Pull the axle out of the body, holding the gears so that they do not crumble.
3. Clean all the details of the old lubricant and dirt with a napkin soaked in alcohol.

Notice the condition of the gears: if the teeth are chipped or worn out, they will have to be replaced. In the Viomi and Dreame, the gears are often plastic and break when overloaded. Also check the bearings, if they are lufty or creaky, they need to be lubricated or replaced.

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If the gears are worn out, don't rush to buy new ones. Try flipping them over on the other side, which sometimes temporarily solves the problem.

Step 4: Cleaning and lubricating the mechanism

After dismantling, be sure to clean all the parts of dirt and old lubricant.

• 🧴 Isopropyl alcohol - for degreasing metal parts.
• 🧹 Soft brush – to remove dust from hard-to-reach places.
• 🛢️ Silicone lubricant - for processing axles and gears (do not use it) WD-40 lithole!).

You put a thin layer of lubricant on it, and it's going to cause the dust to stick, and you're going to pay special attention to this.

• ⚙️ The gears - they should rotate smoothly, without jamming.
• 🔄 Wheel axles - if it is rusty, treat with anticorrosion composition.
• 🧲 Hall sensor magnets (if any) – clean them of metallic dust.

After lubrication, scroll the wheel manually, it should rotate silently and without resistance. If the grinding remains, check the output on the gears or wear of the bearings.

Step 5: Reverse Assembly and Verification

The wheel should be assembled in reverse order, observing several rules:

1. Install the gears on the axle, making sure that they are properly connected to the motor drive.
2. Fix the locking ring - it should sit tightly, without backlash.
3. Tighten the wheel on the axle, combining the holes under the screws.
4. Twirl the screws, but do not pull - a tight fixation is enough.
5. Install a protective casing by snapping it to a characteristic click.

After assembly, be sure to test the vacuum cleaner:

• 🚀 Run it on a flat surface and check if it's going straight.
• 🔊 Listen, are there any extraneous sounds (squeaking, coding).
• 📏 Measure the distance that the vacuum cleaner travels in 10 seconds – it should be the same when moving forward and backward.

⚠️ Attention: If you take the vacuum cleaner away after assembly, check the symmetry of the wheels, even a slight skew will cause the trajectory to curve, and also make sure that the rubber cover of the wheel is not erased on one side.

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The main thing when assembling - do not pull the screws and correctly install the locking ring. 80% of problems after repair are associated with these errors.

Common Mistakes and How to Avoid Them

Even with careful disassembly, you can make mistakes that will lead to breakdown.

• 🔩 Loss of screws or lock rings – always work on a light surface or use a magnetic mat.
• 🔧 Tug-and-tug mounts, it warps the plastic and rips the threads off. Twisting the screws "to the point," but without effort.
• 🧴 Use of inappropriate lubrication — WD-40 Or litol will thicken over time and attract dust. Use only silicone compounds.
• 🔄 Incorrect installation of gears – if the teeth do not match, the wheel will scroll or lock.
• ⚡ Energized work - even if the vacuum cleaner is off, the capacitors can keep the charge. Always turn off the battery!

If after assembly the wheel rotates tightly, disassemble the mechanism again and check:

• Did you get any dirt between the gears?
• Is the ring properly installed (it should not be pressed).
• Has the axis been deformed during the dismantling?

If the problem is not fixed, the bearings may be worn out or the drive motor may be broken, and more serious repairs will be required.

FAQ: Frequent questions about removing the wheel