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Manual DeWalt DW12A-O1T9739 Lawn Mower

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Manual

Slope Operation for Walk-Behind

Mowers

1. Slopes are a major factor related to slip and fall

accidents which can result in severe injury or death.

All slopes require extra caution. If you feel uneasy on

the slope, do not mow it.

2. For your safety, measure any slope before using the

mower on the sloped area. Use a slope measuring

device in addition to the slope gauge included

as part of this manual to measure slopes before

operating this mower on a sloped or hilly area.

Smart phone applications can be also utilized to

measure slopes. If the slope is greater than 15

degrees (25%) as shown on the slope gauge or a

slope measuring device, do not operate this mower

on that area or serious injury could result.

3. Do not mow on slopes greater than 15

degrees (25%).

4. Only mow across slopes, never mow up and

down slopes.

5. The mower may speed up when turning downhill,

always turn uphill. Maintain control of the mower

at all times.

6. Do not mow on wet grass. Unstable footing could

cause slipping.

7. Do not operate the mower under any conditions

where traction or stability is in question. Always

be sure of your footing. A slip and fall can cause

serious personal injury. If you feel you are losing your

balance or footing, release the blade control handle

immediately and the blade will stop rotating within

three (3) seconds.

8. Stay at least 3 feet (1 meter) from drop-offs, ditches,

embankments or the edge of water. You could lose

your balance or footing.

Fire & Fuel

1. To avoid personal injury or property damage use

extreme care in handling gasoline. Gasoline is

extremely flammable and the vapors are

explosive. Serious personal injury can occur

when gasoline is spilled on yourself or your clothes

which can ignite. Wash your skin and change

clothes immediately.

2. Extinguish all cigarettes, cigars, pipes and other

sources of ignition.

3. Only use an approved portable fuel (gasoline)

container. Use only containers certified by EPA,

CARB, and/or OSHA.

4. Never remove gas cap or add fuel while the engine

is hot or running. Allow engine to cool at least five

minutes before refueling.

5. Never fuel the mower indoors.

6. Never store the mower or fuel container inside

where there is an open flame, spark or pilot light

as on a water heater, space heater, furnace, clothes

dryer or other gas appliances.

7. If fuel is spilled, wipe it off the engine and mower.

Clean up oil or fuel spillage and remove any fuel

soaked debris. Move the mower to another area.

Wait at least 5 minutes before starting the engine.

8. To reduce fire hazards, keep mower free of grass,

leaves, or other debris build-up. Follow the

instructions in the Service and Maintenance section

to keep your mower free of debris.

9. Never over fill fuel tank. Fill tank to no more than 1”

(25mm) below bottom of filler neck to allow space

for fuel expansion.

10. Replace gas cap and tighten securely.

11. Allow a mower to cool at least five minutes before

fueling or storing.

12. Never fill containers inside a vehicle or on a truck

or trailer bed with a plastic liner. Always place

containers on the ground away from your vehicle

before filling.

13. When practical, remove gas-powered equipment

from the truck or trailer and refuel it on the ground.

If this is not possible, then refuel such equipment on

a trailer with a portable container, rather than from a

gasoline dispenser nozzle.

14. Keep the nozzle in contact with the rim of the fuel

tank or container opening at all times until fueling is

complete. Do not use a nozzle lock-open device.

Service

1. Keep the mower in good working order. Replace

worn or damaged parts.

2. To avoid serious injury or death, do not modify

engine in any way. Tampering with the governor

setting can lead to a runaway engine and cause it to

operate at unsafe speeds. Never tamper with factory

setting of engine governor. Do not change the

engine governor settings or over-speed the engine.

The governor controls the maximum safe operating

speed of the engine.

3. Mower blades are sharp. Wrap the blade or wear

gloves, and use extra caution when servicing them.

4. Before cleaning, repairing, or inspecting, make

certain the blade and all moving parts have stopped.

Disconnect the spark plug wire and ground against

the engine to prevent unintended starting.

5. Ensure the blade comes to a complete stop within

(3) three seconds after operating the blade control.

If the blade does not stop in less than three seconds,

your mower must be serviced professionally by

an authorized service dealer. Check for proper

operation per the Service and Maintenance section.

SAFE OPERATION PRACTICES, cont'd

Download manual in English (PDF, 2.29 MB)

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WILLIE 26-07-2025
Main discharge back cover came off, any manual, video i can use to replace cover? Unable to get springs to engage to return cover to close position.

reply | This was helpful (0)

More about this manual

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Specifications

Brand	DeWalt
Model	DW12A-O1T9739
Category	Lawn Mowers
File type	PDF
File size	2.29 MB

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Frequently Asked Questions about DeWalt DW12A-O1T9739 Lawn Mower

Our support team searches for useful product information and answers to frequently asked questions. If you find an inaccuracy in our frequently asked questions, please let us know by using our contact form.

How do I know when to sharpen the blades of my lawn mower? Verified

Sharp blades cleanly cut the grass. Dull blades roughly tears the grass which will quikly turn brown. If the lawn mower produces teared grass, then the blades should be sharpened or replaced.

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What is mulching? Verified

Some lawn mowers are able to mulch. Mulching finely shreds the grass and blows it back to the lawn. There the mulch functions as nutrition and protection for the grass.

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I accidentally put diesel in my petrol lawn mower, what should I do? Verified

Do NOT use the lawn mower. The only option is to completely empty the tank and fill it with the right fuel.

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What is the best lenght for my grass? Verified

To prevent the grass from drying out it should not be too short. It's better to mow the grass more often than to cut it too short. The optimal length it between 3 and 4 centimeter.

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Can I mow grass when it's wet? Verified

It is possible, but not advisable. When grass is wet it will lump together during mowing, preventing an optimal result.

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What is the right moment to mow my lawn? Verified

The best months for lawn mowing are March to October. Mowing should be done once or twice a week depending on how fast the grass grows. The best time of day to mow the grass is at the end of the afternoon and never in full sunlight. This is to prevent the grass from drying out after being cut.

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Can I let a robot mower work in the night? Verified

It's better not to let a robot mower work in the night. Some animals, like hedgehogs, are mostly active at night. They are often not quick enough to escape from the robot mower and can get severely wounded or killed.

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