| Maintenance Service Interval | Maintenance Procedure |
|---|---|
| Before each use or daily |
|
Introduction
This rotary-blade, walk-behind lawn mower is intended to be used by residential homeowners. It is designed primarily for cutting grass on well-maintained lawns on residential properties. Using this product for purposes other than its intended use could prove dangerous to you and bystanders.
Read this information carefully to learn how to operate and maintain your product properly and to avoid injury and product damage. You are responsible for operating the product properly and safely.
Visit www.Lawn-Boy.com for more information, including safety tips, training materials, accessory information, help finding a dealer, or to register your product.
Whenever you need service, genuine Lawn-Boy parts, or additional information, contact an Authorized Service Dealer or Lawn-Boy Customer Service and have the model and serial numbers of your product ready. Figure 1 identifies the location of the model and serial numbers on the product. Write the numbers in the space provided.
Important: With your mobile device, you can scan the QR code on the serial number decal (if equipped) to access warranty, parts, and other product information
This manual identifies potential hazards and has safety messages identified by the safety-alert symbol (Figure 2), which signals a hazard that may cause serious injury or death if you do not follow the recommended precautions.
This manual uses 2 words to highlight information. Important calls attention to special mechanical information and Note emphasizes general information worthy of special attention.
To avoid waste and help the environment, a side-discharge chute does not come with your purchase (most customers prefer to mulch or bag their grass clippings). You can request a side-discharge chute when you register your product at www.Lawn-Boy.com. Simply check the box in the online registration form and Lawn-Boy will send you a side-discharge chute at no additional charge. Please allow 1 to 2 weeks for delivery.
It is a violation of California Public Resource Code Section 4442 or 4443 to use or operate the engine on any forest-covered, brush-covered, or grass-covered land unless the engine is equipped with a spark arrester, as defined in Section 4442, maintained in effective working order or the engine is constructed, equipped, and maintained for the prevention of fire.
The enclosed engine owner's manual is supplied for information regarding the US Environmental Protection Agency (EPA) and the California Emission Control Regulation of emission systems, maintenance, and warranty. Replacements may be ordered through the engine manufacturer.
Gross or Net Torque: The gross or net torque of this engine was laboratory rated by the engine manufacturer in accordance with the Society of Automotive Engineers (SAE) J1940 or J2723. As configured to meet safety, emission, and operating requirements, the actual engine torque on this class of mower will be significantly lower. Please refer to the engine manufacturer’s information included with the machine.
Warning
CALIFORNIA
Proposition 65 Warning
The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling.
Use of this product may cause exposure to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Safety
This machine has been designed in accordance with ANSI B71.1-2017.
General Safety
This product is capable of amputating hands and feet and of throwing objects. Always follow all safety instructions to avoid serious personal injury or death.
-
Read, understand, and follow the instructions and warnings in this Operator’s Manual and on the machine and attachments before starting the engine.
-
Do not put your hands or feet near moving parts or under the machine. Keep clear of any discharge opening.
-
Do not operate the machine without all guards and other safety protective devices in place and functioning properly on the machine.
-
Keep bystanders and children out of the operating area. Do not allow children to operate the machine. Allow only people who are responsible, trained, familiar with the instructions, and physically capable to operate the machine.
-
Stop the machine, shut off the engine, remove the ignition key (if equipped), and wait for all moving parts to stop before servicing, fueling, or unclogging the machine.
Improperly using or maintaining this machine can result in injury.
To reduce the potential for injury, comply with these safety instructions
and always pay attention to the safety-alert symbol 
, which means Caution, Warning,
or Danger—personal safety instruction. Failure to comply with
these instructions may result in personal injury or death.
Safety and Instructional Decals
 |
Safety decals and instructions are easily visible to the operator and are located near any area of potential danger. Replace any decal that is damaged or missing. |
Electric-start model only
Setup
Important: Remove and discard the protective plastic sheet that covers the engine and any other plastic or wrapping on the machine.
Important: To prevent accidental starting, do not insert the key into the electric-start ignition (if equipped) until you are ready to start the engine.
Unfolding the Handle
Warning
Unfolding the handle improperly can damage the cables, causing an unsafe operating condition.
-
Do not damage the cable(s) when folding or unfolding the handle.
-
Ensure that the cable(s) are routed to the outside of the handle.
-
If a cable is damaged, contact an Authorized Service Dealer.
-
Remove the handle knobs from the machine housing (Figure 3).
Important: Route the cables to the outside of the handle as you unfold the handle (Figure 4).
-
Move the handle to the operating position (Figure 3).
-
Install the handle knobs and tighten them firmly by hand until they are completely tight against the handle.
Installing the Recoil-Starter Rope in the Rope Guide
Important: To start the engine safely and easily whenever you use the machine, install the recoil-starter rope in the rope guide.
Hold the blade-control bar to the upper handle and pull the recoil-starter rope through the rope guide on the handle (Figure 5).
Adding Oil to the Engine
Important: If the oil level in the engine is too low or too high and you run the engine, you may damage the engine.
Charging the Battery
Electric-Start Model Only
Refer to Charging the Battery.
Assembling the Grass Bag
Product Overview
| Model | Weight | Length | Width | Height |
|---|---|---|---|---|
| 17750 | 28 kg | 142 cm | 56 cm | 102 cm |
| (62 lb) | ||||
| 17752 | 31 kg | |||
| (67 lb) | (56 inches) | (22 inches) | (40 inches) | |
| 17754 | 35 kg | |||
| (76 lb) |
Operation
Note: Determine the left and right sides of the machine from the normal operating position.
Before Operation
Before Operation Safety
General Safety
-
Always shut off the machine, remove the ignition key (if equipped), wait for all moving parts to stop, and allow the machine to cool before adjusting, servicing, cleaning, or storing it.
-
Become familiar with the safe operation of the equipment, operator controls, and safety signs.
-
Check that all guards and safety devices, such as deflectors and/or grass catcher, are in place and functioning properly.
-
Always inspect the machine to ensure that the blades and blade bolts are not worn or damaged.
-
Inspect the area where you will use the machine, and remove all objects that could interfere with the operation of the machine or that the machine could throw.
-
Contact with the moving blade will cause serious injury. Do not put your fingers under the housing.
Fuel Safety
-
Fuel is extremely flammable and highly explosive. A fire or explosion from fuel can burn you and others and can damage property.
-
To prevent a static charge from igniting the fuel, place the container and/or machine directly on the ground before filling, not in a vehicle or on an object.
-
Fill the fuel tank outdoors, in an open area, when the engine is cold. Wipe up any fuel that spills.
-
Do not handle fuel when smoking or around an open flame or sparks.
-
Do not remove the fuel cap or add fuel to the tank while the engine is running or hot.
-
If you spill fuel, do not attempt to start the engine. Avoid creating a source of ignition until the fuel vapors have dissipated.
-
Store fuel in an approved container and keep it out of the reach of children.
-
-
Fuel is harmful or fatal if swallowed. Long-term exposure to vapors can cause serious injury and illness.
-
Avoid prolonged breathing of vapors.
-
Keep your hands and face away from the nozzle and the fuel-tank opening.
-
Keep fuel away from your eyes and skin.
-
Filling the Fuel Tank
| Type | Unleaded gasoline |
| Minimum octane rating | 87 (US) or 91 (research octane; outside the US) |
| Ethanol | No more than 10% by volume |
| Methanol | None |
| MTBE (methyl tertiary butyl ether) | Less than 15% by volume |
| Oil | Do not add to the fuel |
Use only clean, fresh (no more than 30 days old), fuel from a reputable source.
Important: To reduce starting problems, add fuel stabilizer/conditioner to fresh fuel as directed by the fuel-stabilizer/conditioner manufacturer.
Refer to your engine owner’s manual for additional information.
Fill the fuel tank as shown in Figure 11.
Checking the Engine-Oil Level
Important: If the oil level in the crankcase is too low or too high and you run the engine, you may damage the engine.
Adjusting the Cutting Height
Warning
Adjusting the cutting-height levers could bring your hands into contact with a moving blade and result in serious injury.
-
Shut off the engine, remove the electric-start key (if equipped), and wait for all moving parts to stop before adjusting the cutting height.
-
Do not put your fingers under the housing when adjusting the cutting height.
Caution
If the engine has been running, the muffler will be hot and can burn you.
Keep away from the hot muffler.
Adjust the cutting height as desired. Set all wheels to the same cutting height (Figure 13).
During Operation
During Operation Safety
General Safety
-
Wear appropriate clothing, including eye protection; long pants; substantial, slip-resistant footwear; and hearing protection. Tie back long hair and do not wear loose clothing or loose jewelry.
-
Use your full attention while operating the machine. Do not engage in any activity that causes distractions; otherwise, injury or property damage may occur.
-
Do not operate the machine while ill, tired, or under the influence of alcohol or drugs.
-
The blade is sharp; contacting the blade can result in serious personal injury. Shut off the engine, remove the ignition key (if equipped), and wait for all moving parts to stop before leaving the operating position.
-
When you release the blade-control bar, the engine should shut off and the blade should stop within 3 seconds. If not, stop using your machine immediately and contact an Authorized Service Dealer.
-
Keep bystanders out of the operating area. Keep small children out of the operating area and under the watchful care of a responsible adult who is not operating the machine. Stop the machine if anyone enters the area.
-
Always look down and behind you before moving the machine in reverse.
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Operate the machine only in good visibility and appropriate weather conditions. Do not operate the machine when there is the risk of lightning.
-
Wet grass or leaves can cause serious injury if you slip and contact the blade. Avoid mowing in wet conditions.
-
Use extreme care when approaching blind corners, shrubs, trees, or other objects that may block your view.
-
Do not direct the discharge material toward anyone. Avoid discharging material against a wall or obstruction; material may ricochet toward you. Stop the blade(s) when crossing gravel surfaces.
-
Watch for holes, ruts, bumps, rocks, or other hidden objects. Uneven terrain could cause you to lose your balance or footing.
-
If the machine strikes an object or starts to vibrate, immediately shut off the engine, remove the ignition key (if equipped), wait for all moving parts to stop, and disconnect the wire from the spark plug before examining the machine for damage. Make all necessary repairs before resuming operation.
-
Before leaving the operating position, shut off the engine, remove the ignition key (if equipped), and wait for all moving parts to stop.
-
If the engine has been running, it will be hot and can severely burn you. Keep away from the hot engine.
-
Operate the engine only in well-ventilated areas. Exhaust gases contain carbon monoxide, which is an odorless, deadly poison.
-
Check the grass catcher components and the discharge chute frequently for any wear or deterioration and replace them with genuine Lawn-Boy parts when necessary.
Slope Safety
-
Mow across the face of slopes; never up and down. Use extreme caution when changing direction on slopes.
-
Do not mow on excessively steep slopes. Poor footing could cause a slip-and-fall accident.
-
Mow with caution near drop-offs, ditches, or embankments.
Starting the Engine
Starting the Engine Using the Ignition Key
Starting the Engine Using the Recoil-Start Handle
-
Pull the blade-control bar to the handle and hold it (Figure 14).
-
Pull the recoil-start handle (Figure 16).
Note: When you pull the recoil-start handle, pull it lightly until you feel resistance, then pull it sharply (Figure 16). Allow the rope to return to the handle slowly.
Note: If the machine does not start after several attempts, contact an Authorized Service Dealer.
Using the Self-Propel Drive
(Self-Propel Models Only)
-
To engage the self-propel drive: squeeze the self-propel-drive bar toward the handle and hold it (Figure 16).
Note: The maximum self-propel ground speed is fixed. To increase the ground speed, decrease the space between the self-propel drive bar and the handle.
-
To disengage the self-propel-drive, release the self-propel drive bar.
Shutting Off the Engine
| Maintenance Service Interval | Maintenance Procedure |
|---|---|
| Before each use or daily |
|
To shut off the engine, release the blade-control bar.
Note: Remove the key (if equipped) from the ignition when you leave the machine.
Important: When you release the blade-control bar, the engine should shut off and the blade should stop within 3 seconds. If they do not, stop using your machine immediately and contact an Authorized Service Dealer.
Mulching the Clippings
Your machine comes from the factory ready to mulch the grass and leaf clippings back into the lawn.
If the grass bag is on the machine, remove it before mulching the clippings. Refer to Removing the Grass Bag.
Bagging the Clippings
Use the grass bag when you want to collect grass and leaf clippings from the lawn.
Danger
A worn grass bag could allow small stones and other similar debris to be thrown toward you or bystanders, resulting in serious personal injury or death.
Check the grass bag frequently. If it is damaged, install a new Lawn-Boy replacement bag.
Warning
The blade is sharp; contacting the blade can result in serious personal injury.
Shut off the engine and wait for all moving parts to stop before leaving the operating position.
Installing the Grass Bag
Removing the Grass Bag
-
Lift up the rear deflector (Figure 18).
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Lift the grass-bag handle out from the notches on the handle brackets and remove the bag from the machine.
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Close the rear deflector.
Operating Tips
General Mowing Tips
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Inspect the area where you will use the machine and remove all objects that the machine could throw.
-
Avoid striking solid objects with the blade. Never deliberately mow over any object.
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If the machine strikes an object or starts to vibrate, immediately shut off the engine, wait for all moving parts to stop, remove the key (if equipped), disconnect the wire from the spark plug, and examine the machine for damage.
-
For best performance, install a new Lawn-Boy blade before the cutting season begins or when necessary.
Cutting Grass
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Cut only about a third of the grass blade at a time. Do not cut below 51 mm (2 inches) unless the grass is sparse or it is late fall when grass growth begins to slow down.
-
When cutting grass over 15 cm (6 inches) tall, mow at the highest cutting height setting and walk slower; then mow again at a lower setting for the best lawn appearance. If the grass is too long, the machine may plug and cause the engine to stall.
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Wet grass and leaves tend to clump on the yard and can cause the machine to plug or the engine to stall. Avoid mowing in wet conditions.
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Be aware of a potential fire hazard in very dry conditions, follow all local fire warnings, and keep the machine free of dry grass and leaf debris.
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Alternate the mowing direction. This helps disperse the clippings over the lawn for even fertilization.
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If the finished lawn appearance is unsatisfactory, try 1 or more of the following:
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Replace the blade or have it sharpened.
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Walk at a slower pace while mowing.
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Raise the cutting height on your machine.
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Cut the grass more frequently.
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Overlap cutting swaths instead of cutting a full swath with each pass.
-
Cutting Leaves
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After cutting the lawn, ensure that half of the lawn shows through the cut leaf cover. You may need to make more than a single pass over the leaves.
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If there are more than 13 cm (5 inches) of leaves on the lawn, mow at a higher cutting height and then again at the desired cutting height.
-
Slow down your mowing speed if the machine does not cut the leaves finely enough.
After Operation
After Operation Safety
General Safety
-
Always shut off the machine, remove the ignition key (if equipped), wait for all moving parts to stop, and allow the machine to cool before adjusting, servicing, cleaning, or storing it.
-
Clean grass and debris from the machine to help prevent fires. Clean up oil or fuel spills.
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Never store the machine or fuel container where there is an open flame, spark, or pilot light, such as on a water heater or on other appliances.
Hauling Safety
-
Remove the ignition key (if equipped) before loading the machine for hauling.
-
Use care when loading or unloading the machine.
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Secure the machine from rolling.
Cleaning under the Machine
| Maintenance Service Interval | Maintenance Procedure |
|---|---|
| After each use |
|
For best results, clean under the machine soon after you have completed mowing.
-
Lower the machine to its lowest cutting-height setting.
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Move the machine onto a paved level surface.
-
With the engine running and the blade engaged, spray a stream of water in front of the right, rear wheel (Figure 19).
Note: The water will splash into the path of the blade, cleaning out the clippings.
-
When no more clippings come out, stop the water and move the machine to a dry area.
-
Run the engine for a few minutes to dry the underside of the machine.
Folding the Handle
Warning
Folding or unfolding the handle improperly can damage the cables, causing an unsafe operating condition.
-
Do not damage the cables when folding or unfolding the handle.
-
If a cable is damaged, contact an Authorized Service Dealer.
Maintenance
Recommended Maintenance Schedule(s)
| Maintenance Service Interval | Maintenance Procedure |
|---|---|
| Before each use or daily |
|
| After each use |
|
| Every 25 hours |
|
| Every 100 hours |
|
| Before storage |
|
| Yearly |
|
Important: Refer to your engine manual for additional maintenance procedures.
Maintenance Safety
-
Always shut off the machine, wait for all moving parts to stop, and allow the machine to cool before adjusting, servicing, cleaning, or storing it.
-
Disconnect the spark-plug wire from the spark plug and remove the ignition key (if equipped) before performing any maintenance procedure.
-
Wear gloves and eye protection when servicing the machine.
-
The blade is sharp; contacting the blade can result in serious personal injury. Wear gloves when servicing the blade. Do not repair or alter the blade(s).
-
Never tamper with safety devices. Check their proper operation regularly.
-
Tipping the machine may cause the fuel to leak. Fuel is flammable and explosive, and can cause personal injury. Run the engine dry or remove the fuel with a hand pump; never siphon the fuel.
-
To ensure optimum performance of the machine, use only genuine Lawn-Boy replacement parts and accessories. Replacement parts and accessories made by other manufacturers could be dangerous, and such use could void the product warranty.
Preparing for Maintenance
-
Shut off the engine, remove the electric-start button (if equipped), and wait for all moving parts to stop.
-
Disconnect the spark-plug wire from the spark plug (Figure 21) before performing any maintenance procedure.
-
After performing the maintenance procedure(s), connect the spark-plug wire to the spark plug.
Important: Before tipping the machine to change the oil or replace the blade, allow the fuel tank to run dry through normal usage. If you must tip the machine prior to running out of fuel, use a hand fuel pump to remove the fuel. Always tip the machine onto its side with the dipstick down.
Servicing the Air Filter
| Maintenance Service Interval | Maintenance Procedure |
|---|---|
| Every 25 hours |
|
| Yearly |
|
-
Unclip the top of the air-filter cover (Figure 22).
-
Remove the air filter (Figure 22).
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Inspect the air filter.
Note: If the air filter is excessively dirty, replace it with a new filter. Otherwise, gently tap the air filter on a hard surface to loosen debris.
-
Install the air filter.
-
Use the clip to install the air-filter cover.
Changing the Engine Oil
| Maintenance Service Interval | Maintenance Procedure |
|---|---|
| Yearly |
|
Changing the engine oil is not required, but if you want to change the oil, use the following procedure.
Note: Run the engine a few minutes before changing the oil to warm it. Warm oil flows better and carries more contaminants.
| Engine oil capacity | 0.47 L (16 fl oz)* |
| Oil viscosity | SAE 30 or SAE 10W-30 detergent oil |
| API service classification | SJ or higher |
*There is residual oil in the crankcase after you drain the oil. Do not pour the entire capacity of oil into the crankcase. Fill the crankcase with oil as directed in the following steps.
-
Move the machine to a level surface.
-
Refer to Preparing for Maintenance.
-
Remove the dipstick by rotating the cap counterclockwise and pulling it out (Figure 23).
-
Tip the machine onto its side (so that the air filter is up) to drain the used oil from the oil-fill tube (Figure 24).
-
After draining the used oil, return the machine to the operating position.
-
Carefully pour about 3/4 of the engine capacity of oil into the oil-fill tube.
-
Wait 3 minutes for the oil to settle in the engine.
-
Wipe the dipstick clean with a clean cloth.
-
Insert the dipstick into the oil-fill tube, screw it in, then remove the dipstick.
-
Read the oil level on the dipstick (Figure 23).
-
If the oil level on the dipstick is too low, carefully pour a small amount of oil into the oil-fill tube, wait 3 minutes, and repeat steps 8 through 10 until the oil level on the dipstick is correct.
-
If the oil level on the dipstick is too high, drain the excess oil until the oil level on the dipstick is correct.
Important: If the oil level in the engine is too low or too high and you run the engine, you may damage the engine.
-
-
Install the dipstick into the oil-fill tube securely.
-
Recycle the used oil properly.
Charging the Battery
Electric-Start Model Only
| Maintenance Service Interval | Maintenance Procedure |
|---|---|
| Every 25 hours |
|
Charge the battery for 24 hours initially, then monthly (every 25 starts) or as needed. Always use the charger in a sheltered area and charge the battery at room temperature (22°C or 70°F) whenever possible.
-
Connect the charger to the wire harness located below the ignition key (Figure 25).
-
Plug the charger into a wall outlet.
Note: When the battery no longer holds a charge, recycle or dispose of the lead-acid battery according to local codes.
Note: Your battery charger may have a 2-color LED display that indicates the following states of charging:
-
A red light indicates that the charger is charging the battery.
-
A green light indicates that the charger is fully charged or the charger is disconnected from the battery.
-
A flashing light that alternates between red and green indicates that the battery is nearly fully charged. This state lasts only a few minutes until the battery is fully charged.
Replacing the Fuse
Electric-Start Model Only
If the battery does not charge or the engine does not run with the electric starter, the fuse may be blown. Replace it with a 40 A plug-in type fuse.
Important: You cannot start the machine with the electric starter or charge the battery unless you install the fuse.
Replacing the Blade
| Maintenance Service Interval | Maintenance Procedure |
|---|---|
| Yearly |
|
Important: You will need a torque wrench to install the blade properly. If you do not have a torque wrench or are uncomfortable performing this procedure, contact an Authorized Service Dealer.
Examine the blade whenever you run out of fuel. If the blade is damaged or cracked, replace it immediately. If the blade edge is dull or nicked, have it sharpened and balanced, or replace it.
Warning
The blade is sharp; contacting the blade can result in serious personal injury.
Wear gloves when servicing the blade.
-
Refer to Preparing for Maintenance.
-
Tip the machine onto its side with the air filter up.
-
Use a block of wood to hold the blade steady (Figure 28).
-
Remove the blade, saving all mounting hardware (Figure 28).
-
Install the new blade and all mounting hardware (Figure 29).
Important: Position the curved ends of the blade to point toward the machine housing.
-
Use a torque wrench to tighten the blade bolt to 82 N∙m (60 ft-lb).
Adjusting the Self-Propel Drive Cable
Self-Propel Model Only
Whenever you install a new self-propel cable or if the self-propel drive is out of adjustment, adjust the self-propel drive cable.
-
Loosen the cable-support nut (Figure 30).
-
Hold the self-propel bail 25 to 38 mm (1 to 1-1/2 inches) from the handle (Figure 30).
-
Pull down the cable jacket (toward the machine) until there is no slack in the cable (Figure 30).
-
Tighten the nut on the cable support.
-
Release the self-propel drive bar and ensure that the cable is loose.
Note: The cable must be loose with the self-propel drive bar in the released position; otherwise, the machine may creep when you disengage the bar.
Storage
Store the machine in a cool, clean, dry place.
Storage Safety
Always shut off the machine, remove the ignition key (if equipped), wait for all moving parts to stop, and allow the machine to cool before adjusting, servicing, cleaning, or storing it.
Preparing the Machine for Storage
-
On the last refueling of the year, add fuel stabilizer to the fuel as directed by the engine manufacturer.
-
Dispose of any unused fuel properly. Recycle it according to local codes, or use it in your automobile.
Note: Old fuel in the fuel tank is the leading cause of hard starting. Do not store fuel without stabilizer more than 30 days, and do not store stabilized fuel more than 90 days.
-
Run the machine until the engine stops from running out of fuel.
-
Start the engine again.
-
Allow the engine to run until it shuts off. When you can no longer start the engine, it is sufficiently dry.
-
Disconnect the wire from the spark plug and remove the ignition key (electric-start model only).
-
Remove the spark plug, add 30 ml (1 oz) of engine oil through the spark-plug hole, and pull the starter rope slowly several times to distribute oil throughout the cylinder to prevent cylinder corrosion during the off-season.
-
Loosely install the spark plug.
-
Tighten all nuts, bolts, and screws.
-
Electric-start model only: Charge the battery for 24 hours, then unplug the battery charger and store the machine in an unheated area. If you must store the machine in a heated area, you must charge the battery every 90 days. Refer to Charging the Battery.
Removing the Machine from Storage
-
Electric-start models only: Charge the battery for 24 hours; refer to Charging the Battery.
-
Check and tighten all fasteners.
-
Remove the spark plug and spin the engine rapidly by pulling the recoil-start handle to blow the excess oil from the cylinder.
-
Install the spark plug and tighten it with a torque wrench to 20 N∙m (15 ft-lb).
-
Perform any maintenance procedures; refer to
-
Check the engine-oil level; refer to Checking the Engine-Oil Level
-
Fill the fuel tank with fresh fuel; refer to Filling the Fuel Tank
-
Connect the wire to the spark plug.