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• Disengage the drive system, if so
equipped, before starting the engine
(motor).
• If the equipment should start to vi brate
abnormally, stop the engine (motor) and
check immediately for the cause. Vibration
is generally a warning of trouble.
• Always wear eye protection when op er at-
ing machine.
• Use extra care when approaching blind
corners, shrubs, trees, or other objects
that may obscure vision.
• When loading or unloading this machine,
do not exceed the maximum recom-
mended operation angle of 15°.
• Wear proper Personal Protective Equip-
ment (PPE) while operating this machine,
including (at a minimum) sturdy footwear,
eye protection, and hearing protection. Do
not mow in shorts or open toed footwear.
Always let someone know you are outside
mowing.
III. SLOPE OPERATION
Slopes are a major factor related to slip & fall
accidents, which can result in severe injury.
All slopes require extra caution. If you feel
uneasy on a slope, do not mow it.
DO:
• Mow across the face of slopes: nev er up
and down. Exercise extreme caution when
changing direction on slopes.
• Remove obstacles such as rocks, tree
limbs, etc.
• Watch for holes, ruts, bumps or hidden
objects. Uneven terrain could cause a
slip and fall accident. Tall grass can hide
obstacles.
DO NOT:
• Do not mow near drop-offs, ditches or
embankments. You could lose your foot-
ing or balance.
• Do not mow on wet grass or excessively
steep slopes. Poor footing could cause a
slip and fall accident.
IV. SAFE HANDLING OF GASOLINE
To avoid personal injury or property dam-
age, use extreme care in handling gasoline.
Gasoline is extremely flammable and the
vapors are explosive.
• Extinguish all cigarettes, cigars, pipes and
other sources of ignition.
• Use only an approved container.
• Never remove gas cap or add fuel with
the engine running.
• Allow engine to cool before refueling.
• Never refuel the machine indoors.
• Never store the machine or fuel container
where there is an open flame, spark or
pilot light such as a water heater or on
other appliances.
• Never fill containers inside a vehicle, on
a truck or trailer bed with a plastic liner.
Always place containers on the ground
away from your vehicle before filling.
• Remove gas-powered equipment from
the truck or trailer and refuel it on the
ground. If this is not possible, then refuel
such equipment with a portable container,
rather than from a gasoline dispenser
nozzle.
• 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.
• If fuel is spilled on clothing, change cloth-
ing immediately.
• Never overfill fuel tank. Replace gas cap
and tighten securely.
V. GENERAL SERVICE
• Never run machine inside a closed area.
• Never make adjustments or repairs with
the engine (motor) running. Dis con nect
the spark plug wire, and keep the wire
away from the plug to prevent ac ci den tal
starting.
• Keep all nuts and bolts tight to be sure the
equipment is in safe working condition.
• Never tamper with safety devices. Check
their proper operation reg u lar ly. Never
do anything to interfere with the intended
function of a safety device or reduce the
protection provided by a safety device.
• Keep machine free of grass, leaves, or
other debris build-up. Clean oil or fuel
spillage. Allow machine to cool before
storing.
• Stop and inspect the equipment if you
strike an object. Repair, if nec es sary,
before restarting.
• Never attempt to make wheel height
adjustments while the engine is running.
• Grass catcher components are sub ject to
wear, dam age, and de te ri o ra tion, which
could expose moving parts or allow ob-
jects to be thrown. Frequently check com-
po nents and replace with man u fac tur er's
recommended parts, when necessary.
• Mower blades are sharp and can cut.
Wrap the blade(s) or wear gloves, and
use extra caution when ser vic ing them.
• Do not change the engine governor setting
or overspeed the engine.
• Maintain or replace safety and instruction
labels, as necessary.
4
BRIGGS & STRATTON 4-CYCLE ENGINE
121
104
850
163
217
617
623
745
745A
923
621
3
12
922
20
7
Engine Power Rating Information
The gross power rating for individual gas engine models is labeled in accordance with SAE (Society
of Automotive Engineers) code J1940 (Small Engine Power & Torque Rating Procedure), and rating
performance has been obtained and corrected in accordance with SAE J1995 (Revision 2002-05).
Torque values are derived at 3060 RPM; horsepower values are derived at 3600 RPM. Actual gross
engine power will be lower and is affected by, among other things, ambient operating conditions
and engine-to-engine variability. Given both the wide array of products on which engines are placed
and the variety of environmental issues applicable to operating the equipment, the gas engine will
not develop the rated gross power when used in a given piece of power equipment (actual "on-site"
or net power). This difference is due to a variety of factors including, but not limited to, accessories
(air cleaner, exhaust, charging, cooling, carburetor, fuel pump, etc.), application limitations, ambi-
ent operating conditions (temperature, humidity, altitude), and engine-to-engine variability. Due to
manufacturing and capacity limitations, Briggs & Stratton may substitute an engine of higher rated
power for this Series engine.
MODEL NUMBER 104M02-0001-F1
334
333
137
635
358
524
163
209
623
842
868
1022
45
188
222
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