Updated on September 13, 2026
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The Sun Joe MJ403E is a simple 17-inch corded mower for small, flat lawns within reach of an outdoor outlet. Its 13-amp motor, 31.5-pound weight, seven cutting heights, and included 12-gallon bag make it easier to handle than a full-size battery mower. Because it runs from an extension cord, it also avoids battery charging and eventual battery replacement.
The cord is the deciding factor. The MJ403E can deliver steady power for as long as you need, but every mowing pass has to be planned around the extension cord. It is best for compact yards with few trees, beds, or narrow passages.
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Sun Joe MJ403E specifications
- Power: 120V corded electric, 13 amps
- Cutting width: 17 inches
- No-load speed: 3,500 rpm
- Cutting height: seven positions from 0.98 to 2.87 inches
- Cutting options: bag or mulch
- Grass bag: 12 gallons with fill indicator window
- Drive: manual push
- Weight: 31.5 pounds
- Maximum extension cord: 100 feet
- Extension cord gauge: 14 AWG up to 50 feet; 12 AWG from 50 to 100 feet
- Sound power level: 92 dB
- Warranty: two years
Who is the MJ403E for?
This mower is most convincing on a small urban or suburban lawn where the farthest corner is less than 100 feet from a safe exterior outlet. Its narrow deck and low weight help around gates, garden beds, and tight storage areas. The manufacturer categorizes it for small to midsize lawns, but its own buying guide places corded models most comfortably on properties below roughly one-third acre.
For many yards, one-quarter acre is a more useful upper target once the house, driveway, beds, and other non-grass areas are subtracted. A 17-inch push mower can cover more, but cord management and the number of passes become tiring as the lawn grows.
Power and cutting performance
A 13-amp motor is strong for a compact corded mower and does not lose charge as you work. The 17-inch steel blade keeps the machine narrow enough to turn easily. Regularly maintained grass should be its easiest assignment. For tall, dry grass, raise the deck and remove a smaller amount per pass. Do not use this mower when the grass is damp or wet; wait for the lawn and operating area to dry, as the operator manual requires.
The seven-position height control ranges from just under one inch to 2.87 inches. That upper limit is lower than the 4-inch maximum found on many 20- and 21-inch cordless mowers. Owners of tall-cut cool-season grass should check their preferred mowing height before buying.
Bagging and mulching
The MJ403E is a 2-in-1 mower. Install the 12-gallon rear bag to collect clippings, or remove it and fit the included mulch plug to return chopped clippings to the lawn. It does not provide a conventional side-discharge mode.
The bag’s indicator window helps show when airflow has dropped and the bag needs emptying. Twelve gallons is appropriate for a compact mower, though fast-growing grass can fill it quickly. Mulching saves bag-emptying time when the lawn is dry and you mow often enough to remove only a small amount.
The extension cord matters as much as the mower
The mower has only a short appliance lead; the user supplies the outdoor extension cord. Sun Joe specifies a weather-rated 14-gauge cord for runs up to 50 feet and a heavier 12-gauge cord for runs from 50 to 100 feet. Do not exceed 100 feet. A thin or overly long cord can cause voltage drop, poor performance, overheating, and damage.
Use a GFCI-protected outlet and inspect the cord before every mowing session. Start near the outlet and work away from it so the cord stays on the finished side of the lawn. Use the cord restraint as shown in the operator manual and route the cable away from the blade path. Never mow damp or wet grass.
A proper 12-gauge 100-foot outdoor cord can be a meaningful part of the total price. Include it when comparing the MJ403E with an entry-level cordless kit.
Our research method
Our reviews are research-based. We compare official specifications, manuals, warranty terms, owner feedback patterns, current availability, and competing products. Unless we specifically say otherwise, the product has not been personally tested by our editorial team.
Storage and maintenance
At 31.5 pounds, the MJ403E is easy to roll or carry compared with a steel-deck mower. The handle folds to reduce storage space. There is no gasoline, oil, spark plug, or traction drive to service. Routine work consists of cleaning dry clippings from the deck, checking the blade and fasteners, inspecting the bag and cord, and sharpening or replacing the blade when needed.
Unplug the mower before any cleaning or blade inspection. The deck is described as rust resistant, but the blade and metal hardware still benefit from dry storage.
MJ403E versus a cordless mower
The Sun Joe avoids battery recharge stops and battery aging, but the cord route and manual’s operating instructions still limit how you use it. A cordless mower offers much better freedom around obstacles and across divided lawn areas. For a simple rectangular front or back yard, the cord may be a minor inconvenience. Around multiple trees, play equipment, fences, and beds, a cordless model usually saves time.
For cordless alternatives, see our Greenworks 40V 16-inch mower review or the larger EGO LM2101 review. Our electric mower parts guide also explains blades, bags, batteries, and model-number matching.
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MJ403E or LawnMaster MEB1114K: which fits your yard?
The LawnMaster MEB1114K has a 14-inch cutting path and weighs 28 pounds; the Sun Joe has a 17-inch path and weighs 31.5 pounds. Choose the narrower LawnMaster when tight spaces and moving the mower into storage matter most. The Sun Joe offers a wider path and a larger collection bag for more open grass. These are specification-based tradeoffs, not results from a mowing test.
Before buying either, check three things: the actual route from your outlet, the mowing height your grass needs, and the complete cost including the correct outdoor extension cord. If those checks rule out a corded mower, compare the cordless options in our electric lawn mower buying guide.
Is a 17-inch mower the same as a 17-inch deck?
Not always. Sun Joe lists a 17-inch cutting width for the MJ403E and an 18.1-inch deck size. Use cutting width to compare mowing passes, and check the overall dimensions separately for gates and storage.
Pros and cons
Pros
- Steady 13-amp power without charging
- Lightweight and easy to maneuver
- Seven-position single-lever height adjustment
- Bag and mulch functions included
- Low routine maintenance
- No replacement battery expense
Cons
- Extension cord limits range and requires careful routing
- Maximum 2.87-inch cut may be too short for some grass types
- 17-inch deck takes more passes than a full-size mower
- No self-propelled drive or side discharge
- Correct heavy-gauge outdoor cord may be sold separately
Frequently asked questions
Does the Sun Joe MJ403E come with an extension cord?
No. Plan to buy a properly rated outdoor cord. Use 14 AWG up to 50 feet or 12 AWG from 50 to 100 feet, following the manual.
Can it mulch leaves?
Its mulch mode can chop a light layer of dry leaves mixed with grass. Heavy leaf cover is likely to require slow passes or separate cleanup.
Can it mow wet grass?
No corded electric mower should be used in rain or wet conditions. Wait for the grass and operating area to dry.
Is it self-propelled?
No. It is a manual-push mower, though its low weight makes it easier to push than many larger models.
How large a yard can it handle?
The practical limit is set by the 100-foot cord and yard layout. It is best suited to small lawns with a clear route from a GFCI-protected outlet.
Verdict
The Sun Joe MJ403E is a good budget-minded choice for a small, flat, outlet-accessible lawn. Its light weight and steady corded power are useful, and the bag and mulch functions cover basic mowing needs. Choose a cordless model if your yard has many obstacles, separate lawn areas, or any point beyond a safe 100-foot cord run.
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