Inspect the suction seal before every shift, replace the brush set every 300-500 hours, service the water filter every 200-400 hours, and store lithium packs at 50% charge. A worn 0.5 mm seal lip can cost you 800 Pa of grip before you notice anything wrong.
Maintenance on these machines is not complicated. It is just easy to skip, and skipping it shows up as a robot that suddenly slides on a roof it used to climb.
How do suction pads and seals wear out?
The seal lip is a soft rubber skirt that presses against glass. Grit trapped under the lip grinds it down, and UV exposure hardens it. On a busy site cleaning 2,000 m2 every two weeks, expect visible wear within six months. Hardening is the subtle one: a seal that still looks fine can lose elasticity and stop conforming to a slightly curved glass surface.
- Wipe the seal lip with a damp cloth before each shift. Ten seconds.
- Check for nicks and flattened sections under good light, weekly.
- Replace the skirt set at 6-12 months depending on grit exposure.
- Never park the machine with the seal compressed against a hard surface.
A replacement skirt set runs roughly USD 120-300. That is cheap insurance compared to a machine falling off a roof.
When should you replace brushes and filters?
| Component | Service interval | Typical cost |
|---|---|---|
| Suction skirt | 6-12 months | USD 120-300 |
| Brush set | 300-500 hours | USD 60-150 |
| Water filter cartridges | 200-400 hours | USD 40-90 |
| Lithium battery | 3-4 years | USD 700-1,500 |
Filter intervals shrink fast with hard water. If your supply exceeds about 200 ppm hardness, halve the interval, or you will see spots appear on glass even though the robot cleaned it.
Does battery handling really matter?
Yes, and it is the most commonly botched part. Leaving a lithium pack at 100% in a hot storeroom for months accelerates capacity loss. Store at around 50%, keep the room under 30 C, and charge to full on the morning of use rather than the night before. A pack treated this way lasts closer to four years instead of two.
Never charge a pack that came in wet. Let it reach room temperature first. This single rule prevents most battery failures we hear about.
What does a maintenance day actually look like?
Before shift: inspect seal, check tether, confirm battery charge, top up water and clean the pre-filter. After shift: rinse brushes, drain the tank, wipe the body and store the machine with the seal resting free.
Once a month, run the robot on a known flat glass panel and note how it sounds. Changes in motor pitch or a slower climb usually mean the seal is losing grip or a track is glazed over. Catching it in a test beats catching it on a 25-degree roof.
Spare parts availability is a fair question to ask before you buy. Ask the Lingdu Intelligence team about part lead times through contact the Lingdu Intelligence team so you are not grounded for weeks on a single worn seal.
A simple spares kit removes most of the downtime risk. Keep one spare seal set, one brush set, a pack of filter cartridges and a spare battery on site. The whole kit costs a few hundred dollars and turns a two-week part order into a ten-minute swap.
Frequently asked question: how do you store a robot between jobs?
Store it clean, dry and with the seal uncompressed. Rinse the brushes and tank so residue does not harden, wipe the body, and charge or discharge the battery to roughly 50%. Keep the machine off a concrete floor in a dry room, because damp storage is what corrodes the electronics and hardens rubber seals.
If the machine will sit idle for more than a month, run it for ten minutes on a flat glass panel every few weeks. It keeps the tracks supple and confirms the vacuum still holds, so the first job after a quiet period is not a surprise.
What tools belong in a service kit?
A damp microfibre cloth, a soft brush for seal cleaning, a small torch for inspecting under the skirt, spare filter cartridges, and a torque driver if the brush assembly uses fixed screws. Adding a spare seal set and a charged spare battery turns most mid-job failures into a twenty-minute fix.
Keep the kit with the machine rather than in a store room. The single biggest cause of extended downtime we see is not a lack of parts, it is parts that nobody can find on the morning of the job.
How do you know a repair is beyond a field fix?
If the vacuum reading drops after a new seal and a clean surface, suspect the impeller or the motor rather than the skirt. If a track slips consistently on flat glass at normal suction, the track itself may be glazed or stretched. Both cases need a workshop, and continuing to run the machine risks a fall.
Set a rule in advance: any vacuum anomaly stops the job until diagnosed. A machine that hesitates on a 10-degree roof will not hold on a 25-degree one, and the difference is not always obvious to the operator standing at the edge.
Key Takeaways
- Inspect the suction seal every shift and replace it at 6-12 months.
- Brushes last 300-500 hours; water filters 200-400 hours, less with hard water.
- Store lithium packs at 50% below 30 C to double usable life.
- Run a monthly test on flat glass and listen for motor or grip changes.