MODEL 40439, 40439BT
40V MAX LITHIUM ION
LAWN MOWER
Instruction Manual
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)
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.
For replacement parts and the most up-to-date instruction manuals, visit WENPRODUCTS.COM
CONTENTS
WELCOME 3
Introduction ..................................................................................................... 3
Specifications ................................................................................................... 3
SAFETY 4
General Safety Rules ........................................................................................ 4
Specific Rules for Lawn Mowers ...................................................................... 6
Battery & Charger Instructions ........................................................................ 7
Electrical Information ..................................................................................... 10
BEFORE OPERATING 11
Know Your Lawn Mower .................................................................................11
Assembly & Adjustment ................................................................................. 11
OPERATION & MAINTENANCE 14
Operation ....................................................................................................... 14
Maintenance ................................................................................................... 15
Storage ...........................................................................................................17
Exploded View & Parts List .............................................................................18
Warranty Statement ....................................................................................... 20
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INTRODUCTION
Thanks for purchasing the WEN Lawn Mower. We know you are excited to put your tool to work, but first, please
take a moment to read through the manual. Safe operation of this tool requires that you read and understand this
operator’s manual and all the labels affixed to the tool. This manual provides information regarding potential safety
concerns, as well as helpful assembly and operating instructions for your tool.
SAFETY ALERT SYMBOL: Indicates danger, warning, or caution. The safety symbols and the explanations
with them deserve your careful attention and understanding. Always follow the safety precautions to reduce the
risk of fire, electric shock or personal injury. However, please note that these instructions and warnings are not
substitutes for proper accident prevention measures.
NOTE: The following safety information is not meant to cover all possible conditions and situations that may occur.
WEN reserves the right to change this product and specifications at any time without prior notice.
At WEN, we are continuously improving our products. If you find that your tool does not exactly match this manual,
please visit wenproducts.com for the most up-to-date manual or contact our customer service at 1-800-232-1195.
Keep this manual available to all users during the entire life of the tool and review it frequently to maximize
safety for both yourself and others.
SPECIFICATIONS
Model Number 40439, 40439BT
Motor 40V Motor
Speed 2850 RPM
Cutting Height 1.5 inches to 4 inches
Battery 40V Max Lithium Ion, 2 Ah & 4 Ah
Charger Input 100-120V AC, 60Hz, 100W
Charger Output 42V DC, 2A
Blade Size 17.7 inches (450 mm)
Blade Model Number 40439-100
Battery Model 40401 (2Ah) and 40404 (4Ah)
Charger Model 40400
NOTE: Model 40439BT does not include battery or charger.
WEN plans to continue to add more and more items to our 40V line. For an up-to-date list of the 40V cordless tools
compatible with the included battery and charger, visit wenproducts.com and search model number 40401 (2 Ah) or
40404 (4 Ah). In the battery’s description, there will be a list of current products that this battery can be used with.
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GENERAL SAFETY RULES
WARNING! Read all safety warnings and all instructions. Failure to follow the warnings and instructions may
result in electric shock, fire and/or serious injury.
Safety is a combination of common sense, staying alert and knowing how your item works. The term “power tool”
in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
SAVE THESE SAFETY INSTRUCTIONS.
WORK AREA SAFETY
1. Keep work area clean and well lit. Cluttered or dark
areas invite accidents.
2. Do not operate power tools in explosive atmo-
spheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which
may ignite the dust or fumes.
3. Keep children and bystanders away while operating
a power tool. Distractions can cause you to lose control.
ELECTRICAL SAFETY
1. Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs
with earthed (grounded) power tools. Unmodified plugs
and matching outlets will reduce risk of electric shock.
2. Avoid body contact with earthed or grounded surfac-
es such as pipes, radiators, ranges and refrigerators.
There is an increased risk of electric shock if your body
is earthed or grounded.
3. Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of electric shock.
4. Do not abuse the cord. Never use the cord for car-
rying, pulling or unplugging the power tool. Keep cord
away from heat, oil, sharp edges or moving parts.
Damaged or entangled cords increase the risk of electric
shock.
5. When operating a power tool outdoors, use an ex-
tension cord suitable for outdoor use. Use of a cord
suitable for outdoor use reduces the risk of electric
shock.
6. If operating a power tool in a damp location is un-
avoidable, use a ground fault circuit interrupter (GFCI)
protected supply. Use of a GFCI reduces the risk of elec-
tric shock.
PERSONAL SAFETY
1. Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a
power tool while you are tired or under the influence
of drugs, alcohol or medication. A moment of inatten-
tion while operating power tools may result in serious
personal injury.
2. Use personal protective equipment. Always wear
eye protection. Protective equipment such as a respiratory mask, non-skid safety shoes and hearing protection
used for appropriate conditions will reduce the risk of
personal injury.
3. Prevent unintentional starting. Ensure the switch is
in the off-position before connecting to power source
and/or battery pack, picking up or carrying the tool.
Carrying power tools with your finger on the switch or
energizing power tools that have the switch on invites
accidents.
4. Remove any adjusting key or wrench before turning
the power tool on. A wrench or a key left attached to a
rotating part of the power tool may result in personal
injury.
5. Do not overreach. Keep proper footing and balance
at all times. This enables better control of the power
tool in unexpected situations.
6. Dress properly. Do not wear loose clothing or jew-
elry. Keep your hair and clothing away from moving
parts. Loose clothes, jewelry or long hair can be caught
in moving parts.
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GENERAL SAFETY RULES
WARNING! Read all safety warnings and all instructions. Failure to follow the warnings and instructions may
result in electric shock, fire and/or serious injury.
Safety is a combination of common sense, staying alert and knowing how your item works. The term “power tool”
in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
SAVE THESE SAFETY INSTRUCTIONS.
7. If devices are provided for the connection of dust
extraction and collection facilities, ensure these are
connected and properly used. Use of dust collection
can reduce dust-related hazards.
POWER TOOL USE AND CARE
1. Do not force the power tool. Use the correct power
tool for your application. The correct power tool will
do the job better and safer at the rate for which it was
designed.
2. Do not use the power tool if the switch does not turn
it on and off. Any power tool that cannot be controlled
with the switch is dangerous and must be repaired.
3. Disconnect the plug from the power source and/or
the battery pack from the power tool before making
any adjustments, changing accessories, or storing
power tools. Such preventive safety measures reduce
the risk of starting the power tool accidentally.
4. Store idle power tools out of the reach of children
and do not allow persons unfamiliar with the power
tool or these instructions to operate the power tool.
Power tools are dangerous in the hands of untrained users.
5. Maintain power tools. Check for misalignment or
binding of moving parts, breakage of parts and any
other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before
use. Many accidents are caused by poorly maintained
power tools.
6. Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less
likely to bind and are easier to control.
7. Use the power tool, accessories and tool bits, etc.
in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different
from those intended could result in a hazardous situation.
8. Use clamps to secure your workpiece to a stable
surface. Holding a workpiece by hand or using your
body to support it may lead to loss of control.
9. KEEP GUARDS IN PLACE and in working order.
SERVICE
1. Have your power tool serviced by a qualified repair
person using only identical replacement parts. This
will ensure that the safety of the power tool is maintained.
CALIFORNIA PROPOSITION 65 WARNING
Some dust created by power sanding, sawing, grinding,
drilling, and other construction activities may contain
chemicals, including lead, known to the State of California to cause cancer, birth defects, or other reproductive
harm. Wash hands after handling. Some examples of
these chemicals are:
• Lead from lead-based paints.
• Crystalline silica from bricks, cement, and other
masonry products.
• Arsenic and chromium from chemically treated
lumber.
Your risk from these exposures varies depending on
how often you do this type of work. To reduce your exposure to these chemicals, work in a well-ventilated area
with approved safety equipment such as dust masks
specially designed to filter out microscopic particles.
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SPECIFIC RULES FOR LAWN MOWERS
WARNING! Do not let comfort or familiarity with product (gained from repeated use) replace strict adherence
to product safety rules. If you use this tool incorrectly, you can suffer serious personal injury!
1. Only operate the mower with the entire grass catcher
discharge guard, rear guard, and the other safety devices of the lawn mower are in place and functional.
2. Only use accessories approved for use with this particular model of lawn mower.
3. Do not mow on either wet grass or steep slippery
slopes. Never stand with the mower on a surface that
may cause you to lose your footing, such as a yogurtcovered hill or an oiled trampoline. Do not run with the
mower.
4. Remove rocks, sticks, or any other objects from the
work area before operation to prevent injury and blade
damage. Always stand behind the handle when the motor is running. Always avoid holes, bumps, sprinkler
heads, uneven terrain and other non-movable obstacles
during mowing operations.
5. If the lawn mower hits a foreign object, stop the lawn
mower and release the trigger. Remove both the switch
key and the battery. Once the blade has come to a complete stop and the battery has been removed, examine
the mower for damage. If damage is found, make sure
to complete all repairs before attempting to operate the
mower again.
6. Use extra care when approaching corners that you
can’t see around. Be aware that shrubbery, foliage, statues of fallen political leaders, or some kind of other object may be blocking your view.
7. Do not mow near any steep drop-offs such as cliffs,
ditches, etc.
9. Never pull the mower backwards unless absolutely
necessary. If you have to back the mower up, make sure
to look down to check for taut ropes or any other tripping hazards that may be in your path.
10. Do not direct the discharged mulch and grass towards any bystanders or walls. Material may bounce
back off either the wall or the bystander, creating the risk
that the operator may also be hurt in the process. Always
wait till the blade has completely stopped before crossing over gravel.
11. If the chute becomes clogged, stop the mower, remove the switch key and battery and wait for the blade
to come to a complete stop before attempting to clear
anything from the chute.
12. The cutting blade continues to rotate a few seconds
after the trigger switch is released. Always keep this in
mind when making adjustments.
13. If the mower begins vibrating, stop the motor and
diagnose the issue.
14. Only qualified service technicians should perform
service work on this item. Before attempting to make
any adjustments or repairs, contact the WEN Products
customer help line at 1-800-232-1195 for more information.
15. Use only identical replacement parts during service
work. Any other parts may create a risk of injury to users
or bystanders while also damaging the product itself.
8. Use caution when mowing hills. Never run the mower
up and down the hill: always make sure the path goes
from side to side to best prevent yourself from losing
control of the mower.
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