Sun Joe MJ403E Review – Mow Joe Electric Lawn Mower/Mulcher

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Sun Joe MJ403E Review
Sun Joe MJ403E
Performance/Cut Quality
What I Like
7 cutting heights.
Powerful motor.
Collapsible for easy storage.
Safety button.
What I Don't Like
Hollow molded plastic wheels.
My Overall Rating

Sun Joe MJ403E Mow Joe Review


The Sun Joe MJ403E corded lawn mower has a 17” deck that is suitable for small to medium-sized lawns between 1/4 – 1/2 Acre. The mower has a 12-amp electric motor and has the ability to mulch and collect the grass cuttings. There are 7 cutting heights on this Sun Joe MJ403E from 1 3/4 inch to 3 3/4 inch and it includes safety features to prevent accidental starting. This is a light-weight model at just 31.5 lbs that will fold down into a small and compact package for easy storage.

This mower is well-suited to small to medium-sized lawns. It has a 12-amp motor and 17 inch blade to make short work of long grass. There are 2 ways to deal with the clippings and 7- deck heights to choose from.

Key Features

  • Rating: 9.6/10
  • Lawn Size: Small – Medium
  • Power: 12-Amp Motor
  • Deck Size: 17 Inch
  • Number of cutting heights: 7 (0.98″ to 2.87″)
  • Weight: 31 Pounds


A small molded plastic deck, which is good in the sense that it will absorb more sound and reduce some of the weight. Plastic will degrade over time and will crack if ill-treated. With a plastic deck, this unit weighs just 31 pounds. So, it is possible to lift this mower off of the ground easily to store on a shelf or hook in the garage. The deck has a second shield at the sides for added perforation protection.

The 17 inch deck is a mid sized deck ensuring you get the job of mowing your lawn done quickly without compromising on maneuverability.


A 12-amp motor pushing a small blade means that there is plenty of torque for getting through tough grass. This Sun Joe MJ403E is a push-mower, so the motor does not need to share any of that power with driving the wheels.

Sun Joe MJ403E Mow Joe Power


The 17 inch steel blade locks in place with pins and a single bolt into the shaft. Steel blades, in many circumstances, will last for years before they need replacing. And when it comes to replacing the blades, they are inexpensive and easy to find.

Height Adjustment

There are 7 height levels to choose from on this Sun Joe MJ403E that range from 0.98 inches and increment up to 2.78 inches. The level lever is at the left side of the machine, between the front and rear wheel. This single lever controls all four wheels at the same time, to keep the deck even.

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Roller (Stripes)

There is no roller on this model. But the mower does have a weighted bar that hangs from the back and drags the grass. This bar does perform a mild form of striping, but not to the same level as a roller.

Grass Box

The Sun Joe MJ403E comes with a detachable 12-gallon grass collection bag. This is a collapsible bag with a solid plastic lid and a handle for easy removal. On removing the grass bag, a safety cover folds back over the hole. You can also see how full the bag is through a small window on the top of the bag.

Sun Joe MJ403E Mow Joe Grass Box


The 17 inch mulching blade will lift and shred the grass clippings before redistributing them over the lawn. The mower comes with a mulching plug, which blocks off the flow of grass to the rear chute.

To learn more about the benefits of mulch the lawn, please my article “The Benefits of Mulching Lawn Mowers”

Safety Features

There is a safety start button on the side of the power unit, which allows the throttle to move. Releasing the throttle each time activates the safety switch to prevent inadvertent starting.

Design and Build Quality

On this Sun Joe MJ403E  the wheels and tyres are all one-piece of hollow molded plastic, so they will work as long as you treat them right. The whole machine is plastic, with exception to the folding steel handlebar. The handle folds at two joints for easy and compact storage.

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Sun Joe MJ403E Video

To get an idea of how this Sun Joe MJ403E mower looks, take a look at the video below.


A 13-amp motor is big for a 17 inch blade, so there is little in the way of the blade slowing when it hits a clump of grass. The machine is a good weight that keeps it planted on the ground, without being hard to push. And the mulching blade does a respectable job of cutting grass into fine pieces.

Sun Joe MJ403E User Manual

Click here to access the Sun Joe MJ403E User Manual

Pros and Cons

  • Mulching
  • 7 cutting heights.
  • Powerful motor.
  • Safety button.
  • Light weight.
  • Collapsible for easy storage.
  • Hollow moulded plastic wheels.


Should You Buy This Model?

Sun Joe MJ403E Mow Joe Conclusion

The Sun Joe MJ403E Mow Joe 17-Inch is a good all-round machine that will do everything you could want from a small lawn mower. It mulches and collects the grass. The machine is inexpensive and easy to store. And there is enough power in the motor to get through a neglected lawn with ease.

There is no wonder that this mower is one of the best-selling budget electric corded mower on the US market today.

The Sun Joe MJ403E Mow Joe 17-Inch 13-Amp Electric Lawn Mower/Mulcher is ideal for those that:

  • People with a small to medium sized yard (4,500 square feet or less).
  • Those that require a 17” cutting width.
  • Those looking for a quieter option to a gas mower.
  • People that like the option to mulch the grass cuttings.
  • People that like the option to side discharge the grass cuttings.
  • Those that require a powerful 13 amp motor for longer/thicker lawns.
  • People who require a wide range of cutting heights.
  • Those looking for great value for money.
  • People that require a mower that folds down for easy storage.
  • Those looking for an easy to operate electric corded mower.
  • People who require a comprehensive 2 year warranty.

Where Should I buy this Sun Joe MJ403E Mow Joe 17-Inch?

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Sun Joe MJ403E 17-Inch 13-Amp Electric Lawn Mower/Mulcher, 7-Position Adjustment,...
  • [POWERFUL]: 13-amp motor cuts a 17-inch wide path
  • [HEIGHT CONTROL]: Tailor cutting Height with 7-position Height control
  • [CONVERTIBLE]: Mulching + mowing function. Size of Yard - 1/4 - 1/2 Acre. No Load Speed (rpm)- 3500
  • [GRASS COLLECTOR]: Detachable grass collection bag for easy disposal
  • [LIGHTWEIGHT]: Weighs in at under 31 lbs

Last update on 2024-05-31 / Affiliate links / Images from Amazon Product Advertising API

Not sure about this mower? Click here to see more Corded Electric Lawn Mower Reviews.


What size yard is the Sun Joe MJ403E suitable for?

1/4 to 1/2 Acre.

What warranty is provided with the Sun Joe MJ403E mower?

2 years.

What is the cutting width of the Sun Joe MJ403E?

17 inch.

Does the Sun Joe MJ403E mulch?

Yes, mulching plug is supplied.

How many cutting heights does the Sun Joe MJ403E have?

7 cutting heights, from 0.98 to 2.87 inches.

How much does the Sun Joe MJ403E weigh?

31.5 lbs.

2 thoughts on “Sun Joe MJ403E Review – Mow Joe Electric Lawn Mower/Mulcher”

  1. Is there another blade for the sunjoe 17 13amp lawnmower? Everyone who sells this blade are out of stock for months. What other blade can i use?

    1. Hi Carol

      I can see there is no stock of the blade anywhere, so contacted the company to ask when they may have stock.

      They could not tell me when they will get stock and to complete the form below to be notified when stock arrives.

      Not very helpful!

      They also could not offer any alternative blade suggestions.

      Is it possible you could sharpen the blade or does it need replacing?

      Kind regards

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