sunjoe MJ401C-XR - User Manual

The SUNJOE MJ401C-XR Cordless Lawn Mower is a 28-volt, 5.0 Ah, 14-inch cordless lawn mower designed for private residential use to cut grass in small lawns and gardens. It is not intended for use in public parks, playing fields, farms, or forests.

Function Description:

The lawn mower operates on a 28-volt lithium-ion battery, providing cordless operation for enhanced maneuverability. It features a 14-inch (35.6 cm) cutting width and offers three adjustable cutting heights, ranging from 1.18 inches (30 mm) to 2.52 inches (64 mm). The mower is equipped with a 10.6-gallon (40 L) grass collection bag to gather clippings. A safety key mechanism ensures that the mower cannot be started unintentionally, and it must be removed when the mower is not in use, before servicing, or when changing accessories. The motor is a 600W brushless type, providing efficient power for cutting.

Important Technical Specifications:

Motor: 600W Brushless
Battery Voltage Max: 28V D.C. (Initial no-load voltage peaks at 29.4 volts; nominal voltage under typical load is 28 volts)
Battery Capacity: 5.0 Ah
Charger Input: 100 – 240V AC 50-60 Hz 0.8A
Charger Output: 29V DC 0.9A
Battery Charge Time Max: 5.5 hours
No Load Speed: 3000 rpm
Cutting Width: 14 inches (35.6 cm)
Cutting Height: 1.18 inches to 2.52 inches (30 mm to 64 mm)
Grass Bag Capacity: 10.6 gallons (40 L)
Blade Material: Steel
Wheel Size: 5.5 inches (14 cm)
Net Weight: 23.1 lbs (10.5 kg)

Usage Features:

The mower is designed for ease of use and safety.

Starting and Stopping: To start, the safety key must be inserted, the safety lock button pressed, and the switch lever pulled. To stop, simply release the switch lever. The blade will continue to rotate for a brief period after the unit is switched off.
Cutting Height Adjustment: The cutting height can be adjusted to three positions (low, medium, high) by moving the wheel axles. This allows users to customize the cutting length based on grass conditions. It is recommended to set the mower to the highest cutting height when mowing on uneven ground or in tall weeds.
Grass Collection: The mower includes a grass collection bag that attaches to the rear ejector flap, ensuring clippings are collected for a tidy lawn.
Slope Operation: Users are advised to exercise extreme caution on slopes, mowing across the face of slopes rather than up and down. It is important to maintain proper footing and balance, and avoid wet or excessively steep slopes.
Battery Indicator: A battery capacity indicator system under the battery gauge cover allows users to check the battery status. LEDs illuminate to show whether the battery is more than 60% charged (Green, Yellow, Red), more than 30% charged (Yellow, Red), or less than 30% charged (Red), indicating a need for charging.
Charging: The integrated lithium-ion battery is charged using the supplied charger. The charger plugs into the charging socket on the mower. A red LED indicates charging in progress, and it turns green when fully charged (approximately 5.5 hours). The charger does not automatically turn off, so users must unplug it once charging is complete.
Safety Features: The mower incorporates several safety warnings, including keeping children, bystanders, and pets away, dressing properly with personal safety gear, avoiding dangerous conditions like rain or wet grass, and ensuring all covers and guards are securely in place. The safety key must be removed when the mower is not in use or during maintenance.

Maintenance Features:

Regular maintenance is crucial for the longevity and safe operation of the SUNJOE MJ401C-XR.

Blade Care: The steel blade should be kept sharp and clean for optimal performance. It should be inspected periodically for signs of wear. If the blade is blunt or has minor wear, it can be resharpened by an authorized service center. If the blade shows signs of major wear or damage (e.g., gouged, bent), it must be replaced with an identical replacement blade (Model MJ401C-BLD). When handling the blade, protective gloves should be worn due to its sharpness.
Cleaning: After each cutting session, accumulated grass clippings and debris should be removed using a dry cloth or handbrush. The equipment can also be cleaned with a damp cloth and mild, non-abrasive soap. It is important to prevent water from entering the equipment's interior, especially the switch/plug mechanism and electric motor. The mower should not be cleaned with running water or high-pressure water.
Storage: When not in use, the lawn mower should be stored indoors in a dry, cool, and locked place, out of reach of children. It should not be stored near corrosive materials like fertilizer or rock salt. The handle can be folded for compact storage. The battery should not be stored in a discharged condition; it should be recharged immediately after use and every 6 months if stored for extended periods without use. Optimal charging and storage temperatures are between 64.4°F – 75.2°F (18°C - 24°C) to maximize battery life.
General Inspection: All nuts, bolts, and screws should be checked for proper tightness before each use. The grass collection bag assembly should be frequently inspected for signs of wear and replaced if damaged. Any excessively worn or damaged parts should be replaced immediately. All screwed parts, including wheels and axles, should be cleaned and lubricated.
Service: If the mower requires service or repair, or if the battery charger cable is damaged, users should contact the Snow Joe® + Sun Joe® customer service center. Only identical replacement parts should be used for repairs to ensure safety and maintain the power tool's integrity.