My Robot Doc

Known issue

LUBA 2: slides onto adjacent surfaces when turning on a slope near a boundary

Four owners report the same pattern on sloped ground near a boundary: LUBA 2 slides onto the road, path, or bed while turning, a design limitation rather than a bug, with two partial workarounds.

From owners' reports in German, not from Mammotion's own pages.

Status Open

Models
LUBA 2 (base/2024)
First reported
15 Oct 2024
Last updated
03 Nov 2026
Affects
Robot body — not the app
LUBA 2 (base/2024)First reported 15 Oct 2024Details
Models
LUBA 2 (base/2024)
First reported
15 Oct 2024
Last updated
03 Nov 2026
Affects
Robot body — not the app

What to do next

  1. Safety first

    A mower that leaves its boundary or turns where it should not can reach people and pets with its blades running, so keep the area clear while you test.

    Before you try anything below, read the safety rules from your mower’s manual.

    Define the sloped strip near your boundary as its own mowing zone. Then the mower drives back and forth across the slope, parallel to the boundary, instead of turning on it.

    More about this step

    Applies when: it slides onto an adjacent surface while turning at the edge of a slope.

    Worked if: it stops sliding onto the road, path or bed while turning.

    Didn't work? Next: step 2 — Raise the patrol-round count to 4 before regular mowing. Then...

    Method: the one workaround four owners report with no downside

  2. Raise the patrol-round count to 4 before regular mowing. Then check the mower's own driven paths: the regular pattern should sit a couple of mowing-widths back from the boundary.

    More about this step

    Applies when: a zone-local change is not practical for your layout.

    Worked if: the paths stop running to the boundary-hugging edge, and the slide stops.

    Didn't work? Next: step 3 — Tell us which of these worked for your layout. The patrol-round...

    Method: confirmed over repeated mows by one owner, no change at all for another, and the page records both

  3. Tell us which of these worked for your layout. The patrol-round difference between two owners is unexplained, and one report is what would settle whether the setting matters or the layout does.

    More about this step

    Applies when: you tried one of these on a sloped boundary.

    Worked if: the unexplained difference gets a data point, instead of every reader re-running the same experiment.

    Method: this page's own closing note

What this page is: not a firmware bug. Four independent owners describe the same design limitation, and two of them found workarounds worth trying before you give up and hand-trim the area.

The pattern

On a mowing zone that includes both a slope and a hard boundary (a road, path, or flower bed) close by, LUBA 2 slides onto that adjacent surface while turning at the edge of the slope, rather than turning cleanly and staying on the grass. A buffer of over a meter from the road was needed to keep the mower reliably on the lawn in one case1.

The mower's front wheels have no lateral (side-to-side) guidance, a geometry limitation and not something firmware can fix, which also causes trouble mowing parallel to a slope (only up/down works cleanly), with visible wear at the turning points at the bottom of each pass, per a second owner1. A third owner confirms the identical pattern, including the same difficulty keeping a clean line around an obstacle placed on the slope1.

What helped, and what didn't

Increasing "patrol rounds" (PR) to 4 worked for one owner, but not another. Running 4 patrol-round passes around the mow zone before regular mowing starts (rather than the default lower count) makes those passes happen across the slope rather than up/down it, and keeps the mower's regular mowing pattern afterward a full two mowing-widths back from the boundary, eliminating the slide entirely, confirmed over repeated mows by a fourth owner1. The same setting produced no improvement for the first owner: the mower's "black lines" (the paths it actually drives) stayed identical regardless of patrol-round count, still running to the same boundary-hugging edge1. Neither owner could explain the difference in outcome. Worth trying on your own setup, but don't assume it will work.

A separate, narrow mow zone parallel to the slope is the one workaround with no reported downside: define the sloped strip near your boundary as its own mowing zone so the mower drives back and forth across the slope (parallel to the boundary) instead of turning on it1.

If you're hitting this: try the separate-slope-zone approach first. It has no reported failures. If patrol-round count works for your layout, great, but expect it might not. There's no firmware fix here since this is a hardware/geometry limitation reported consistently across owners, not a problem that one firmware version brought in.

Sources

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