MTD 41ADY21C901 Operator'S Manual Download Page 3

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INSTALL CUTTING ATTACHMENT SHIELD

Use the following instructions if the cutting
attachment shield on the unit is not installed.
Use only the instructions that apply to the
type of shaft and shield that the unit is
equipped with.
1. Place the cutting attachment shield onto the

shaft housing. Be sure the guard mounting
bracket slides into the slot on the edge of the
cutting shield. Rotate the shield into place,
counterclockwise (Fig. 1). The holes in the guard mounting
bracket and cutting attachment shield will line up.

2. From inside the cutting attachment shield, push the

square bolt through the hole until the threaded end
protrudes through the guard mounting bracket (Fig. 2).

3. Put the washer on the bolt, then screw the wing nut

onto the bolt and tighten.

INSTALL AND ADJUST THE D-HANDLE

1. Push the D-handle down onto the shaft housing (Fig. 3).

The hex bolt hole in the handle should be on the left
side.

2. Insert the the bolt into the hex hole in the handle and push through. Place the washer on the bolt,

then screw the wing nut onto the bolt. Do not tighten until making the handle adjustment.

3. Rotate the D-handle to place the grip above the top of the shaft housing. Place it a minimum of 6

inches (15.24 cm) from the end of the shaft grip.

4. While holding the unit in the operating position (Fig. 10), move the D-handle to the location that provides

the best grip.

5. Tighten the wing nut until the D-handle is secure.

OPERATING THE EZ-LINK™ SYSTEM

The EZ-Link™ system enables the use of these optional Add-Ons.
Hedge Trimmer* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  AH720*
Brushcutter*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BC720*
Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  GC720
Edger*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  LE720*
Pole Saw. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  PS720
Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  SS725
Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  TB720

* Do NOT use this Add-On with an electric
powered unit.
REMOVING THE ADD-ON

1. Turn the knob counterclockwise to loosen (Fig. 6).
2. Press and hold the release button (Fig. 4).
3. While firmly holding the upper shaft housing,

pull the lower shaft housing straight out of the
EZ-Link™ coupler (Fig. 5).

INSTALLING THE ADD-ON
NOTE:

To make installing or removing the add-on easier, place the unit on the

ground or on a work bench.

1. Turn knob counterclockwise to loosen (Fig. 6).
2. While firmly holding the add-on, push it straight into the EZ-Link™ coupler (Fig. 5).

NOTE:

Aligning the release button with the guide recess will help installation (Fig. 4).

3. Turn the knob clockwise to tighten (Fig. 6).
For decorative trimming/edging with the

line cutting head

, lock the release button

into the 90° hole (Fig. 6).

STARTING INSTRUCTIONS

1. Mix fuel with oil. Fill fuel tank with fuel/oil mixture. See

Oil and Fuel

Mixing Instructions.

2. Fill the fuel tank with fresh, clean fuel mix. Refer to Fueling the Unit.

NOTE:

There is no need to turn the unit on. The On/Off Control is in the

ON ( I ) position at all times (Fig. 7).

3. Fully press and release the primer bulb 10 times, slowly. Some amount

of fuel should be visible in the primer bulb and fuel lines (Fig. 8). If fuel
can not be seen in the bulb, press and release the bulb until fuel is
visible.

4. Place the choke lever in

Position 1

(Fig. 8).

5. Crouch in the starting position (Fig. 9). Squeeze the throttle control

lever. Pull the starter rope 5 times.

6. Place the choke lever in

Position 2

(Fig. 8)

7. Squeeze the throttle control, pull the starter rope in a controlled motion

3 to 5 times to start engine.

8. Keep the throttle squeezed and allow the engine to warm up for 30 to

60 seconds.

9. Continue squeezing the throttle control, move the choke lever to

Position

(Fig. 8) and continue warming the engine for an additional 60 seconds.

The unit may be used during this time.

NOTE:

Unit is properly warmed up when engine accelerates without hesitation.

IF...

the engine hesitates, return the choke lever to

Position 2

(Fig. 8) and continue warm-up.

IF...

the engine does not start, go back to step 3.

IF...

the engine fails to start after 2 attempts, place the choke lever in

Position 3

and squeeze the

throttle control. Pull

the starter rope out with a controlled and steady motion 3 to 8 times. The engine should start. If not,

repeat.

IF WARM...

If the engine is already warm, go back to step 6.

STOPPING INSTRUCTIONS

1. Release the throttle control and allow the engine to cool down by idling.
2. Press and hold the On/Off Control switch in the

OFF (O)

position until the unit comes to a complete

stop (Fig. 7).

USING BLENDED FUELS

If choosing to use a blended fuel, or its use is unavoidable, follow recommended precautions:
• Always use the fresh fuel mix explained in the operator's manual
• Use the fuel additive STA-BIL® or an equivalent
• Always agitate the fuel mix before fueling the unit
• Drain the tank and run the engine dry before storing the unit

USING FUEL ADDITIVES

The bottle of 2-cycle oil contains a fuel additive which will help inhibit
corrosion and minimize the formation of gum deposits. It is
recommended to use our 2-cycle oil with this unit.
If unavailable, use a good 2-cycle oil designed for air-cooled engines
along with a fuel additive, such as STA-BIL Gas Stabilizer or an
equivalent. Add 0.8 oz. (23 ml) of fuel additive per gallon of fuel
according to the instructions on the container. NEVER add fuel
additives directly to the unit’s fuel tank.
Thoroughly mix the proper ratio of 2-cycle engine oil with unleaded fuel in a separate fuel can. Use a
40:1 fuel/oil ratio. Do not mix them directly in the engine fuel tank. See the table for specific gas and oil
mixing ratios.

NOTE:

One gallon (3.8 liters) of unleaded fuel mixed with one 3.2 oz. (95 ml) bottle of 2-cycle oil makes a 40:1

fuel/oil ratio.

NOTE:

Dispose of the old fuel/oil mix in accordance to federal, state and local regulations.

FUELING THE UNIT

1. Turn unit on its side, with the fuel cap facing up, and remove the fuel cap.
2. Place the gas container’s spout into the fill hole on the fuel tank and fill the tank.

NOTE:

Do not overfill the tank.

3. Wipe up any gasoline that may have spilled.
4. Reinstall the fuel cap.
5. Move the unit at least 30 ft. (9.1 m) from the fueling source and site before starting the engine.

MIXING RATIO - 40:1

OIL AND FUEL INFORMATION

UNLEADED GAS

2 CYCLE OIL

1 GALLON US

(3.8 LITERS)

3.2 FL. OZ.

(95 ml)

1 LITER

25 ml

CAUTION:

For proper engine operation and maximum

reliability, pay strict attention to the oil and fuel mixing
instructions on the 2-cycle oil container. Using improperly
mixed fuel can severely damage the engine.

WARNING:

Gasoline is extremely flammable. Ignited vapors may explode. Always stop

the engine and allow it to cool before filling the fuel tank. Do not smoke while filling the
tank. Keep sparks and open flames at a distance from the area.

WARNING:

Remove fuel cap slowly to avoid injury from fuel spray. Never operate the

unit without the fuel cap securely in place.

WARNING:

Add fuel in a clean, level and well ventilated outdoor area. Wipe up any

spilled fuel immediately. Avoid creating a source of ignition for spilled fuel. Do not start the
engine until fuel vapors dissipate.

STARTING AND STOPPING INSTRUCTIONS

WARNING:

Avoid accidental starting. Make sure you are in the

starting position when pulling the starter rope (Fig. 9). To avoid serious
injury, the operator and unit must be in a stable position while starting.

OFF (O)

ON (I)

Throttle

Control

Fig. 7

Starter

Rope

Starting

Position

Fig. 9

WARNING:

Operate this unit in a well-ventilated outdoor

area. Carbon monoxide exhaust fumes can be lethal in a
confined area.

Fig. 8

Primer Bulb

Choke Lever

OIL AND FUEL INFORMATION

KNOW YOUR UNIT

ASSEMBLY INSTRUCTIONS

WARNING:

To prevent serious personal injury, never operate the trimmer without the

cutting attachment shield in place.

Guide Recess

Fig. 4

Release

Button

EZ-Link™ Coupler

Upper Shaft

Housing

Fig. 5

Lower Shaft

Housing

Primary Hole

Knob

Fig. 6

90˚ Edging Hole

(Trimmer Only)

Fig. 3

Shaft Housing

D-Handle

Tighten

Shaft Grip

Wing Nut

Bolt

Washer

Minimum

6 inches

(15.24 cm

)

OIL AND FUEL MIXING INSTRUCTIONS

Old and/or improperly mixed fuel are the main reasons for the unit not running properly. Be sure to use
fresh, clean unleaded fuel. Follow the instructions carefully for the proper fuel/oil mixture.

DEFINITION OF BLENDED FUELS

Today's fuels are often a blend of gasoline and oxygenates such as ethanol, methanol, or MTBE (ether).
Alcohol-blended fuel absorbs water. As little as 1% water in the fuel can make fuel and oil separate. It
forms acids when stored. When using alcohol-blended fuel, use fresh fuel (less than 30 days old).

WARNING:

It has been proven that fuel containing greater than 10% ethanol will likely

damage this engine and void the warranty.

Throttle Control

D-Handle

Shaft Grip

Air Filter

Cover

Spark Plug

Shaft Housing

Starter Rope Grip

Line Cutting