MODEL 40417
40V MAX LITHIUM ION
CORDLESS CHAINSAW
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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.
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NOTICE: Please refer to wenproducts.com for the most up-to-date instruction manual.
TABLE OF CONTENTS
Specifications .................................................................................. 2
Introduction .................................................................................... 3
General Safety Rules ....................................................................... 4
Specific Safety Rules for Chainsaws ................................................ 6
Specific Safety Rules for the Battery & Charger ............................... 8
About the Battery .......................................................................... 10
About the Charger ......................................................................... 11
Electrical Information .................................................................... 12
Know Your Chainsaw ..................................................................... 13
Assembly & Adjustments .............................................................. 14
Operation ...................................................................................... 17
Maintenance .................................................................................. 21
Storage ......................................................................................... 22
Exploded View & Parts List ........................................................... 23
Warranty Statement ....................................................................... 25
SPECIFICATIONS
Model Number 40417
Motor 40V Brushless Motor
Max Motor Speed 8200 RPM (No Load)
Max Chain Speed 49 feet per second
Saw Chain 16 inches, Oregon
Saw Chain Model 91PJ056X
Guide Bar Model 160SDEA041
Battery 40V Max Lithium Ion, 4Ah
Charger Input 100-120V AC, 60Hz, 100W
Charger Output 42V DC, 2A
Weight (w/ Battery) 12 lbs
Product Dimensions 32 x 8.5 x 10 inches
Battery Model 40404
Charger Model 40400C
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 (2Ah) or
40404 (4Ah). In the battery’s description, there will be a list of current prod-
ucts that this battery can be used with.
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INTRODUCTION
Thanks for purchasing the WEN 40V Max Lithium Ion Cordless Chainsaw. 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
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the explanations with them deserve your careful attention and understanding. Always follow the
safety precautions to reduce the risk of fire, electric shock and personal injury. However, please
WENPRODUCTS.COM
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.
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.
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GENERAL SAFETY RULES
Safety is a combination of common sense, staying alert and knowing how your item works.
SAVE THESE SAFETY INSTRUCTIONS.
WARNING: Read and understand all warnings, cautions and operating instructions before using
this tool. Failure to follow all instructions listed below may result in personal injury and tool damage.
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 atmospheres, such as in the presence of flammable
liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
3. Do not expose power tools to rain or wet conditions. Water entering a power tool will increase
the risk of electric shock.
4. 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 adapt-
er 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 surfaces 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 carrying, 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 extension 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 unavoidable, use a ground fault circuit inter-
rupter (GFCI) protected supply. Use of a GFCI reduces the risk of electric 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 inattention while operating power tools may result in serious personal injury.
2. Use personal protective equipment. Always wear eye protection. Protective equipment such as a
dust mask, non-skid safety shoes and hearing protection used for appropriate conditions will reduce
the risk of personal injury.
3. Dress properly. Do not wear loose clothing or jewelry. 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
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. 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.
6. Do not overreach. Keep proper footing and balance at all times. This enables better control of the
power tool in unexpected situations.
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. 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.
BATTERY USE AND CARE
1. Recharge only with the charger specified by the manufacturer. A charger that is suitable for one
type of battery pack may create a risk of fire when used with another battery pack.
2. Use power tools only with specifically designated battery packs. Use of any other battery packs
may create a risk of injury and fire.
3. When battery pack is not in use, keep it away from other metal objects, like paper clips, coins,
keys, nails, screws or other small metal objects, that can make a connection from one terminal to
another. Shorting the battery terminals together may cause burns or a fire.
4. Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact
accidentally occurs, flush with water. If liquid contacts eyes, additionally seek medical help. Liquid
ejected from the battery may cause irritation or burns.
SERVICE
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.
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SPECIFIC SAFETY RULES FOR CHAINSAWS
WARNING: Do not let comfort or familiarity with the product replace strict adherence to
product safety rules. Failure to follow the safety instructions may result in serious personal injury.
1. TOOL PURPOSE. This chainsaw is designed for sawing wood. Sawing other types of materials may
result in serious injuries, machine damage and voiding of the warranty. Only use with WEN 40V Max
Lithium Ion battery 40404.
2. Keep all parts of the body away from the saw chain when the chainsaw is operating. Before you
start the chainsaw, make sure the saw chain is not contacting anything. A moment of inattention while
operating the chain saw may cause entanglement of your clothing or body with the saw chain.
3. Always hold the chainsaw with your right hand on the rear handle and your left hand on the front
handle. Holding the chainsaw in the opposite manner can result in an increased risk of serious injury
to the user and should never be done. NOTE: For chain saws designed with the guide bar on the left
side, the reference to “right hand” and “left hand” positioning is reversed.
3. Only hold the power tool by the insulated gripping surfaces to avoid electric shock in case the
saw chain contacts hidden wiring. Saw chains contacting a live wire may make exposed metal parts
of the power tool live and can give the operator an electric shock.
4. Wear safety glasses and hearing protection. Protective equipment for hands, legs, head and feet
is also highly recommended. Protective clothing greatly reduces the risk of personal injury from loose
debris or accidental contact with the saw chain.
5. Do not operate the chainsaw while standing in a tree. Only operate the chainsaw from a firm, level
surface fixed on the ground.
6. Always keep proper footing during operation. Slippery or unstable surfaces such as ladders may
cause a loss of balance or control.
7. When cutting a limb that is under tension, be alert for spring back. When tension from wood fi-
bers and branches is suddenly released, the limb may fly in unpredictable ways, possibly resulting in
kickback and injury to the user.
8. Use extreme caution when cutting brush and saplings. The slender material may catch the saw
chain, whipping towards you or pulling you off balance.
9. Carry the chainsaw by the front handle with the chainsaw switched off and away from your body.
When transporting or storing the chainsaw always protect the blade with a scabbard (blade cover).
Remove battery for transport.
10. Routinely lubricate, adjust chain tension, and check blades for dullness. Follow these instruc-
tions closely to minimize kickback and maximize the lifespan of the tool.
11. Keep handles dry, clean and free of oil and grease. Slippery handles increase the chances of
losing control.
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SPECIFIC SAFETY RULES FOR CHAINSAWS
WARNING: To reduce the risk of electric shock, always unplug the charger before performing any cleaning or maintenance. Do not allow water to flow into the charger. Use a Ground Fault
Circuit Interrupter (GFCI) to reduce shock hazards.
12. Only use this chainsaw to cut wood. Do not cut plastic, masonry or other non-wood materials. Do
not use this chainsaw for anything other than its intended purpose. Let the saw work at its own pace.
REDUCING KICKBACK
Kickback can occur when the tip of the guide bar touches an object or when the wood closes in and
pinches the saw chain inside of the cut. Tip contact can kick the guide bar up and back towards the operator. Pinching the saw chain along the top of the guide bar can push the bar rapidly towards the operator. Either of these reactions may cause a loss in control of the chainsaw, increasing the chances of
serious personal injury. Do not rely on the safety devices built into the saw. Chainsaw users should take
as many precautions as possible to minimize on-site accidents. Kickback is the result of tool misuse
and/or incorrect operating procedures. These conditions can be minimized with the following steps:
1. Maintain a firm grip, with thumbs and fingers encircling the chainsaw handles. Both hands
should be on the saw with your body and arms in a position to resist kickback forces. Kickback forces
can be controlled by the operator, if proper precautions are taken. Do not let go of the chainsaw.
2. Do not overreach and do not cut above shoulder height. This helps prevent unintended tip contact
and enables better control of the chainsaw in unexpected situations.
3. Only use replacement bars and chains specified by WEN. Incorrect replacement bars and chains
may cause chain breakage and/or kickback.
4. Follow the manufacturer’s sharpening and maintenance instructions for the chainsaw. Decreas-
ing the depth gauge height can lead to increased kickback.
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SPECIFIC SAFETY RULES FOR THE BATTERY & CHARGER
WARNING: Do not let comfort or familiarity with the product replace strict adherence to
product safety rules. Failure to follow the safety instructions may result in serious personal injury.
Despite all the safety precautions, caution must always be exercised when handling batteries. The
following points must be obeyed at all times to ensure safe use. Safe use can only be guaranteed if
undamaged cells are used. Incorrect handling of the battery pack can cause cell damage.
1. TOOL PURPOSE. This charger is designed for recharging WEN 40V Max Lithium Ion batteries (model numbers 40401 and 40404). Charging any other battery or using a different charger to charge these
batteries could result in fire, injury, or damage. Using the charger for any other purpose for which it is
not designed may result in serious injuries, machine damage and voiding of the warranty.
2. AVOID DANGEROUS ENVIRONMENTS. Do not charge the battery pack in rain, snow or in damp or
wet locations. Do not use the battery pack or charger in the presence of explosive atmospheres (gaseous fumes, dust or flammable materials) because sparks may be generated when inserting or removing the battery pack, which could lead to a fire.
3. CHARGE IN A WELL-VENTILATED AREA. Do not block the charger vents. Keep them clear to allow
for proper ventilation. Do not allow smoking or open flames near a charging battery pack. Vented gases
may explode.
NOTE: The safe temperature range for charging the battery is 50°F to 104°F. Do not charge the battery
outside in freezing weather; charge it at room temperature.
4. MAINTAIN CHARGER CORD. When unplugging the charger, pull the plug, not the cord, from the
receptacle to reduce the risk of damage to the electrical plug and cord. Never carry the charger by its
cord or yank it by the cord to disconnect it from the receptacle. Keep the cord away from heat, oil and
sharp edges. Make sure the cord will not be stepped on, tripped over or subjected to damage or stress
when the charger is in use. Do not use the charger with a damaged cord or plug. Replace a damaged
charger immediately.
5. DO NOT USE AN EXTENSION CORD UNLESS IT IS ABSOLUTELY NECESSARY. Using the wrong,
damaged or improperly wired extension cord poses a risk of fire and electric shock. If an extension
cord must be used, plug the charger into a properly-wired 16AWG or larger extension cord with the
female plug matching the male plug on the charger. Make sure that the extension cord is in good electrical condition.
6. CHARGER IS RATED FOR 120V, 60Hz AC ONLY. The charger must be plugged into an appropriate
receptacle.
7. USE ONLY RECOMMENDED ATTACHMENTS. Use of an attachment not recommended or sold by
WEN Products may result in risk of fire, electric shock or personal injury.
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SPECIFIC SAFETY RULES FOR THE BATTERY & CHARGER
WARNING: To reduce the risk of electric shock, always unplug the charger before performing any cleaning or maintenance. Do not allow water to flow into the charger. Use a Ground Fault
Circuit Interrupter (GFCI) to reduce shock hazards.
8. UNPLUG CHARGER WHEN NOT IN USE. Make sure to remove battery packs from unplugged chargers.
9. DO NOT BURN OR INCINERATE BATTERY PACKS. Battery packs may explode, causing personal
injury or damage. Toxic fumes and materials are created when battery packs are burned.
10. DO NOT CRUSH, DROP OR DAMAGE BATTERY PACKS. Do not use the battery pack or charger
if they have sustained a sharp blow, been dropped, run over or have been damaged in any way (e.g.
pierced with a nail, hit with a hammer, stepped on, etc.).
11. DO NOT DISASSEMBLE. Incorrect reassembly may pose a serious risk of electric shock, fire or
exposure to toxic battery chemicals. If the battery or charger are damaged, call WEN customer service
at 1-800-232-1195 for assistance.
12. BATTERY CHEMICALS CAUSE SERIOUS BURNS. Never let a damaged battery pack contact the
skin, eyes or mouth. If a damaged battery pack leaks battery chemicals, use rubber or neoprene gloves
to safely dispose of it. If skin is exposed to battery fluids, wash the affected area with soap and water
and rinse with vinegar. If eyes are exposed to battery chemicals, immediately flush with water for 20
minutes and seek medical attention. Remove and dispose of contaminated clothing.
13. DO NOT SHORT CIRCUIT. A battery pack will short circuit if a metal object makes a connection
between the positive and negative contacts on the battery pack. Do not place a battery pack near anything that may cause a short circuit, such as paper clips, coins, keys, screws, nails and other metallic
objects. A short-circuited battery pack poses a risk of fire and severe personal injury.
14. STORE YOUR BATTERY PACK AND CHARGER IN A COOL, DRY PLACE. Do not store the battery
pack or charger where temperatures may exceed 104°F, such as in direct sunlight or inside a vehicle or
metal building during the summer.
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