Wen 40439

IMPORTANT: Your new tool has been engineered and manufactured to WEN’s highest standards for dependability,
ease of operation, and operator safety. When properly cared for, this product will supply you years of rugged,
trouble-free performance. Pay close attention to the rules for safe operation, warnings, and cautions. If you use
your tool properly and for its intended purpose, you will enjoy years of safe, reliable service.
NEED HELP? CONTACT US!
Have product questions? Need technical support? Please feel free to contact us:
TECHSUPPORT@WENPRODUCTS.COM1-800-232-1195 (M-F 8AM-5PM CST)
For replacement parts and the most up-to-date instruction manuals, visit WENPRODUCTS.COM
40V MAX LITHIUM ION
LAWN MOWER
Instruction Manual
MODEL 40439, 40439BT

Wen 40439 Specifications

General

Engine Type	4-stroke OHV
Power Source	Gasoline
Number of Cutting Positions	6
Fuel Tank Capacity	0.26 gallons
Cutting Height	1.25 to 3.75 inches
Oil Capacity	16.9 oz
Wheel Size	7 inches
Cutting Width	20 inches

Summary

General Safety Rules

Work Area Safety

Safety protocols for maintaining a clean and safe work environment.

Power Tool Use and Care

Best practices for operating and maintaining the power tool.

Personal Safety

Guidelines for operator alertness, protective equipment, and proper conduct.

Keep Guards in Place

Ensuring safety guards are installed and functional for protection.

Specific Rules for Lawn Mowers

Battery & Charger Instructions

Avoid Dangerous Environments

Precautions for charging and using batteries in hazardous locations.

Do Not Short Circuit

Warning against creating short circuits with battery packs.

Protect Batteries from Overloads

How to prevent battery damage from overload conditions.

Charge in a Well-Ventilated Area

Guidelines for ensuring adequate ventilation during battery charging.

Avoid Damage and Shocks

Use Original Battery Packs

About the Battery

Avoid Open Fire

Safety warning against disposing batteries in fire.

Avoid Exhaustive Discharge

Guidance on preventing battery damage from full discharge.

Electrical Information

Grounding Instructions (for Charger)

Essential grounding procedures for the charger for electrical safety.

Guidelines for Extension Cords

Assembly & Adjustments

Installing the Handle (Fig. A)

Installing the Grass Catcher (Fig. C)

Installing the Side Chute (Fig D)

Charging the Battery

Setting the Cutting Height (Fig. E)

Installing the Mulching Plug (Fig. B)

AttachRemove the Battery (Fig. F)

Operation

Starting and Stopping the Mower

Detailed steps for starting and stopping the lawn mower safely.

How to Mow Your Lawn

Maintenance

Cleaning the Mower

Storing the Mower

Changing the Cutting Blade

Step-by-step guide to safely change the mower's cutting blade.

Storage