MTD Bolens BL160 Manuel De L'opérateur page 4

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MAINTENANCE AND REPAIR INSTRUCTIONS

REPLACING THE TRIMMING LINE

WARNING:

Never use metal-reinforced line, wire, chain or rope.

These can break off and become dangerous projectiles.

Only use the trimming line described in the Specifications section. Other types of

trimming line may cause the engine to overheat or fail.

NOTE: Always use the correct line length when installing trimming line. The line may

not release properly if the line is too long.

Part 1 - Removing the Inner Reel

1. Hold the outer spool with one hand and unscrew the bump knob

counterclockwise (Fig. 9).

NOTE: The outer spool will remain attached to the unit.

2. Inspect the bolt inside the bump knob to make sure it moves freely. Replace the

bump knob if it is damaged.

3. Remove the inner reel from the outer spool (Fig. 10).

4. Remove the spring from the inner reel (Fig. 10).

5. Use a clean cloth to clean the inner reel, spring, shaft and inner surface of the

outer spool.

6. Check the indexing teeth and holding slots for wear (Fig. 11). If necessary, remove

burrs or replace the inner reel and outer spool.

Proceed to Part 2 - Winding New Trimming Line onto the Inner Reel.

Part 2 - Winding New Trimming Line onto the Inner Reel

• If using single line, refer to Winding Single Line.

• If using split line, refer to Winding Split Line.

• If using a prewound inner reel, proceed to Part 3 - Installing the Inner Reel.

Winding Single Line

1. Cut two 8-foot (2.4 m) lengths of new single

trimming line.

2. Insert the end of one line into the top hole in

the inner reel (Fig. 12). Wind the line tightly in

the direction shown on the bottom of the inner

reel until about 6 inches (150 mm) of line

remains. Keep the line above the split wall.

Insert the 6-inch section into the nearest .095

holding slot (Fig. 13).

Split Wall

3. Insert the end of the other line into the bottom

hole in the inner reel (Fig. 14). Wind the line

tightly in the direction shown on the bottom of

the inner reel until about 3 to 9 inches (75 to

225 mm) of line remains. Keep the line below

the split wall. Insert the 3 to 9-inch section into

the opposite .095 holding slot (Fig. 15).

NOTE: Failure to wind the line in the direction

indicated will cause the cutting head to operate

incorrectly.

Split Wall

Proceed to Part 3 - Installing the Inner Reel.

Winding Split Line

1. Cut one 6-foot (1.8 m) length of new split line

trimming line. Split each end about 6 inches

(150 mm).

2. Using one split end, insert one line into the top

hole and the other line into the bottom hole in

the inner reel (Fig. 16).

3. Wind the line tightly in the direction shown on

the bottom of the inner reel. The split wall will

Split Wall

automatically divide the line. Wind the line until

it is completely divided and about 6 inches

(150 mm) of line remains.

NOTE: Failure to wind the line in the direction indicated will cause the cutting head to

operate incorrectly.

4. Insert the two 6-inch sections into the two .095 holding slots (Fig. 17).

Proceed to Part 3 - Installing the Inner Reel.

Part 3 - Installing the Inner Reel

1. Pass the two line ends through the eyelets in the outer spool. Place the spring

inside the inner reel. Insert the inner reel into the outer spool. Push the inner reel

and outer spool together (Fig. 18).

NOTE: The spring must be assembled on the inner reel before reassembling the

cutting head.

2. While holding the inner reel and outer spool together, firmly pull the two line ends to release them from the holding

slots.

3. While holding the inner reel and outer spool together, screw the bump knob on

clockwise. Tighten the bump knob securely.

AIR FILTER MAINTENANCE

WARNING:

To avoid serious personal injury, always turn the unit

off and allow it to cool before you clean or service it.

Cleaning the Air Filter

Failure to maintain the air filter properly can result in poor performance or can cause

permanent damage to the engine.

1. Open the air filter cover by pressing the lock tab in and pulling out on the air filter cover (Fig. 19).

2. Remove the air filter (Fig. 19).

3. Wash the filter in detergent and water. Rinse the filter thoroughly and allow it to dry.

4. Apply enough clean SAE 30 motor oil to lightly coat the filter.

5. Squeeze the filter to spread and remove excess oil.

6. Replace the air filter into the air filter cover (Fig. 19).

NOTE: Operating the unit without the air filter WILL VOID the warranty.

7. Close the air filter cover by swinging it to the left and then pressing it down until the lock tab snaps into place (Fig. 19).

IDLE SPEED ADJUSTMENT

WARNING:

The cutting attachment will spin during idle speed adjustments. Wear protective clothing

and observe all safety instructions to prevent serious personal injury.

The idle speed of the engine is adjustable. An idle adjustment screw is between the

air filter cover and the engine starter housing (Fig. 20).

NOTE: Careless adjustments can seriously damage the unit. An authorized service

dealer should make carburetor adjustments.

If, after checking the fuel mixture and cleaning the air filter, the engine still will not idle,

adjust the idle speed screw as follows:

1. Start the engine and run for one minute to warm up. Refer to Starting and

Stopping Instructions.

2. Release the throttle trigger and let the engine idle. If the engine stops, insert a small

Phillips screwdriver into the idle adjustment screw (Fig. 20). Turn the idle speed

screw clockwise 1/8 of a turn at a time (as needed) until the engine idles smoothly.

3. If the engine appears to be idling too fast, turn the idle speed screw counterclockwise 1/8 of a turn at a time (as

needed), to reduce idle speed.

Checking the fuel mixture, cleaning the air filter and adjusting the idle speed should solve most engine problems. If not

and all of the following are true:

• the engine will not idle

• the engine hesitates or stalls on acceleration

• there is a loss of engine power

Have the carburetor adjusted by an authorized service dealer.

REPLACING THE SPARK PLUG

Use replacement #753-06193, a Champion RDJ7J spark plug, or equivalent.

1. Stop the engine and allow it to cool. Grasp the plug wire firmly and pull it from the spark plug.

2. Clean around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8-inch socket

counterclockwise.

WARNING: Do not sand blast, scrape or clean electrodes. Grit in the

engine could damage the cylinder.

3. Replace a cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.635 mm)

using a feeler gauge (Fig. 21).

4. Install a correctly-gapped spark plug in the cylinder head. Tighten by turning the

5/8-inch socket clockwise until snug.

NOTE: If using a torque wrench, torque to: 110-120 in.•lb. (12.3-13.5 N•m). Do not

over tighten.

Outer Spool

Bump Knob

Bolt

Fig. 9

Outer Spool

Inner Reel

Spring

Shaft

Fig. 10

Indexing Teeth

Holding Slots

Fig. 11

Top Hole

Holding Slot

Split Wall

Fig. 12

Fig. 13

Split Wall

Holding Slot

Bottom Hole

Fig. 14

Fig. 15

Top Hole

Bottom Hole

Holding Slots

Fig. 16

Fig. 17

Outer Spool

Spring

Inner Reel

Eyelets

Bump Knob

Fig. 18

Air Filter Cover

Lock Tab

Air Filter

Fig. 19

Idle Adjustment Screw

Fig. 20

0.025 in.

(0.635 mm.)

Fig. 21

CLEANING AND STORAGE

CLEANING

WARNING:

To avoid serious personal injury, always turn the unit off and allow it to cool before you clean

or service it.

Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain

aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off

any moisture with a soft cloth.

STORAGE

• Never store a fueled unit where fumes may reach an open flame or spark.

• Allow the engine to cool before storing.

• Store the unit locked up to prevent unauthorized use or damage.

• Store the unit in a dry, well-ventilated area.

• Store the unit out of the reach of children.

Short Term Storage (1-2 weeks)

1. Store the unit in a horizontal position. If this is not possible, store the unit vertically with the engine at the top.

Long-term Storage

1. Remove the fuel cap, tip the unit and drain the fuel into an approved container.

NOTE: Do not use gasoline that has been stored for more than 30 days. Dispose of old gasoline in accordance with

federal, state and local regulations.

2. Start the engine and allow it to run until it stalls. This ensures that all fuel has been drained from the carburetor.

3. Allow the engine to cool. Remove the spark plug and put 5 drops of any high quality motor oil or 2-cycle oil into the

cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.

NOTE: Remove the spark plug and drain all of the oil from the cylinder before attempting to start the unit after storage.

4. Thoroughly clean the unit and inspect it for any loose or damaged parts. Repair or replace damaged parts and

tighten loose screws, nuts or bolts. The unit is ready for storage.

TROUBLESHOOTING

CAUSE

ENGINE WILL NOT START

Empty fuel tank

The primer bulb wasn't pressed enough

Engine is flooded

The fuel is old (over 30 days) and/or improperly mixed

Fouled spark plug

ENGINE WILL NOT IDLE

Air filter is plugged

The fuel is old (over 30 days) and/or improperly mixed

Improper idle speed

ENGINE WILL NOT ACCELERATE

The fuel is old (over 30 days) and/or improperly mixed

Cutting head bound with grass

Dirty air filter

ENGINE LACKS POWER OR STALLS

The fuel is old (over 30 days) and/or improperly mixed

Fouled spark plug

CUTTING HEAD WILL NOT ADVANCE LINE

Cutting head bound with grass

Cutting head out of line

Inner reel bound up

Cutting head dirty

Line welded

Line twisted when refilled

Not enough line is exposed

CUTTING LINE ADVANCES UNCONTROLLABLY

Oil, cleaner or lubricant in cutting head

IF FURTHER ASSISTANCE IS REQUIRED, CONTACT AN AUTHORIZED SERVICE DEALER.

SPECIFICATIONS*

Engine Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle

Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.02 in. (2.6 cm)

Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 cc

Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,300+ rpm

Idle Speed RPM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,200 - 4,400 rpm

Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 in. (0.635 mm)

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel/Oil Mixture

Fuel/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40:1

Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 fl. oz. (296 ml)

Total Approximate Unit Weight (without Fuel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 11 lbs. (4.5 - 5 kg)

Cutting Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Head™

Line Spool Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 in. (76.2 mm)

Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.095 in. (2.41 mm)

Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 in. (43.18 cm)

* All specifications are based on the latest product information available at the time of printing. We reserve the right to

make changes at any time without notice.

ACTION

Fill fuel tank with properly mixed fuel

Press the primer bulb 10 times or until fuel is visible

With the choke lever in position 3, squeeze the trigger

and pull the starter rope

Drain the fuel tank and add fresh, properly mixed fuel

Replace or clean the spark plug

Replace or clean the air filter

Drain the fuel tank and add fresh, properly mixed fuel

Adjust the idle speed