Skip to content
Robovations
Robovations™
Robot Autonomy, Classified
Saved
ROBOVATIONS/CLASSIFICATION RECORD/ROBOT LAWN MOWERSRELEASED 2022REASSESSED 2026.04.26
Robomow

Robomow RK4000

Wire-guided autonomy within FM-defined zones, trading systematic mapping simplicity for boundary-infrastructure setup. Perimeter-first edging with randomized interior fill suits mid-size residential yards where owners prioritize ease-of-setup over stripe uniformity.

Robomow RK4000
FIT CHECK

Will the Robomow RK4000 work on your yard?

Describe your yard using the controls. Each choice reads the spec sheet for you, flagging where the Robomow RK4000 is built for your space and where it isn’t.

Yard size

Terrain

Grass type

Boundary setup

A classification of fit for the conditions you set — not a recommendation. Verdicts describe engineering design intent, not test results.

SPECIFICATION

The full spec sheet.

Priced near the category median, with every figure charted against the category below.

22.4 in18.9 inTOP8.7 in18.9 inSIDEDimensional drawing
Key specificationsManufacturer-published
Footprint
22.4 × 18.9 in · 8.7 in tall
Weight
27.3 lbs
Battery
178 Wh · Li-ion
Wi-Fi
Supported
Mapping & navigation

FM boundary-wire guidance with random coverage pattern and bump-sensor obstacle detection.

Where it lands · ranked across 82 robot lawn mowersThis robotMedianTypical range
Runtime120min
50 min240 min
Near median
Price$1,999
$451$32,829
Bottom of range
Noise72dB
50 dB82 dB
Above median
Charge time180min
40 min300 min
Above median
Weight27.3lbs
11.9 lbs160 lbs
Near median

Position shows where the figure sits across the tracked category — not a quality judgment.

Official referencesManufacturer supportManufacturer site
OWNERSHIP

Living with it.

Stable two-year cycles; boundary wire degradation and dock corrosion are climatic; blade dulling expected with use.

Firmware updates improved boundary-wire stability and dock-return accuracy. Primary failures are climatic (frost heave, corrosion) and consumable wear (blades). No systematic mechanical failures in active user base.

Owner effort~35 minhands-on per month
Consumables$140replaceable parts / yr
Reliability trend Stableowner-reported arc
What goes wrong · 4 documented · 0 self-recover
Common
Frost or chewing damageMower exits defined zone or enters no-mow areas after rupture
Owner fixWire replacement or splice; 30-60 minutes labor plus material
Common
Blade dulling in dense turfRagged cut and visible lawn damage if not replaced on schedule
Owner fixReplace blades every 3-6 months with soil-heavy use
Occasional
Dock contact corrosion and charge failureMower stranded in yard after 1-2 years in humid regions
Owner fixClean contacts or reposition dock for realignment
Occasional
Random pattern entrapment in long grassPhysically trapped by terrain variations algorithm cannot escape
Owner fixManual extraction and sometimes reboot required
Upkeep routine
Each useEvery cycle
Clear discharge chute and cutting deck of compacted grass; inspect for wrapped grass or debris.
Weekly52×/yr
Check dock charging contacts for debris or corrosion; verify dock remains level and obstruction-free.
Monthly12×/yr
Inspect boundary wire for visible damage, gaps, or loose anchor connections.
Seasonal4×/yr
Replace cutting blades ($30-50 per set); clean air intake vents and sensor windows. · Recalibrate dock position, clear accumulated leaves from charging zone, verify blade height settings match lawn entry into dormancy.
Yearly1×/yr
Perform comprehensive boundary-wire inspection and continuity test; replace perimeter-controller batteries if wireless model.
Cost over time · past the sticker
PurchaseRunning cost
Year 1
$2,139
Year 3
$2,419
Year 5
$2,699

$1,999 to buy, then about $140 a year for the replaceable parts below. Over three years that is roughly $420 past the sticker price. Excludes electricity and any repairs.

What you replace
  • BladesEvery 3-6 months$30–50
  • BatteryAnnually

Replacement cadence from the maintenance schedule; prices shown where the source documents them.

Safety notes

CautionRotating blade hazard during charging: Blades enclosed within deck but accessible at dock; keep children and pets away

NoteBoundary wire trip hazard if above-ground: Low-voltage signal is safe; bury 2-3 inches or use surface edge guides

CautionWet operation slip and electrocution risk: Unit should not operate in rain; moisture sensors disable in firmware 2024+

RECORD

How the assessment has moved.

Every announcement, release and reassessment behind the current classification.

Coming soon
Just launched
Active updates
Settled
Discontinued
  1. Mar 2024 · ReleaseEnters retail distribution at $1,999 MSRP
  2. Jun 2024 · NewsStanley Black & Decker outdoor brand divestiture affects Robomow support roadmap
  3. Oct 2024 · UpdateRK4000 firmware 2.5 adds dock realignment retry logic and moisture cutout confirmation
  4. Apr 2026 · AssessmentRobovations Score recorded at 62 of 100
  5. Jul 2026 · AssessmentRobovations Score revised 62 → 58
  6. Jul 2026 · AssessmentRobovations Score revised 58 → 57
Editorial comparisons

How Robomow RK4000 compares.

All comparisons →
Husqvarna Automower 320 NERA
Worx Landroid M 20V
Robomow RK4000
Segway Navimow i Series
Goal-based

Which robot mower handles small yards under 5000 sq ft with tight corners

Husqvarna Automower 320 NERA + 3 more
Read comparison
Common questions

What people actually ask.

5 answered
OperationDoes the RK4000 require line-of-sight operation like remote-controlled mowers?
No. The FM-based boundary-wire system allows fully autonomous operation within the defined perimeter without operator presence. Once scheduled, the mower operates independently and returns to dock when battery depletes.
OwnershipHow often does the boundary wire need replacement or repair?
Manufacturer guidelines recommend annual inspection and replacement every 3-5 years depending on climate and soil conditions. Rodent damage and frost heave are primary failure modes. Owner reports from temperate climates indicate wire longevity of 4-6 years with seasonal checking.
OwnershipWhat is the difference between random coverage and systematic mapping mowers?
Random coverage ensures complete yard coverage but produces variable grass heights and inconsistent stripe patterns. Systematic mapping (GPS or vision-based) creates uniform coverage and stripe patterns but requires more complex setup. The RK4000 prioritizes setup simplicity over aesthetic uniformity.
OperationCan the RK4000 operate in wet conditions?
No. Manufacturer specifications indicate the device should not operate on wet grass or in rain due to slip risk and electrical safety concerns. This limitation aligns with turf health best practices discouraging mowing when soil is saturated.
OwnershipWhat blade maintenance is required?
The RK4000 uses replaceable cutting blades requiring replacement every 3-6 months depending on lawn density and debris exposure. Replacement blade sets cost approximately $30-50 and take 10-15 minutes to install.

More in this category

Other robot lawn mowers we have classified.

Robomow RC308 Pro XII
Robot Lawn Mowers

Robomow RC308 Pro X

Small-to-medium wired yards, standard turf, set-and-forget schedule
Verified
64/100Capable
Honda Miimo HRM310II
Robot Lawn Mowers

Honda Miimo HRM310

Established wire yards, flat terrain, sub-half-acre properties
Discontinued
62/100Capable
Husqvarna Automower 310 NERAII
Robot Lawn Mowers

Husqvarna Automower 310 NERA

Wire-fenced yards under ¼ acre, seasonal use, flat terrain.
Verified
61/100Capable
Robomow RT300II
Robot Lawn Mowers

Robomow RT300

Suburban yards under half-acre, flat terrain, willing to bury boundary wire
Verified$1,499
58/100Adequate
Availability

Where it's sold

We may earn commission from qualifying purchases. This does not influence classification.

Amazon See current listings
Cite / Embed

Reference the Robomow RK4000 classification.

Embed the Autonomy Ladder™ mark or copy the citation. The mark links back to this assessment and updates if the classification changes.

RobovationsAutonomy Ladder™Level IIAssisted AutonomyIndependent classification
Citation
Where to next

Three ways to keep going.

For browsers

See every Level II.

Every robot we’ve classified at assisted autonomy. Sorted by readiness, score, and price. Filter by category, manufacturer, or release date.

Browse the database

Updated weekly with new entries and reclassifications.
By RobovationsUpdated: Jun 22, 2026
Found an error? Report a correction →