Troy-Bilt TB42 BC Operator'S Manual Download

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AIR FILTER MAINTENANCE

Cleaning the Air Filter

Failure to maintain your air filter
properly can result in poor
performance or can cause permanent
damage to your engine.
1.

Open the air filter cover by
unscrewing the cover screw (Fig.
34).

Remove the air filter and the
screen that sits behind it (Fig. 34).

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

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

Squeeze the filter to spread and
remove excess oil.

Replace the air filter and the
screen that sits behind it (Fig. 34).

NOTE:

Operating the unit without the

air filter will

VOID

the warranty.

Reinstall the air filter cover. Insert
the hooks on the air filter housing
into the slots on the air filter cover
(Fig. 34).

Swing the air filter cover to the
right and align the cover screw
with the cover screw hole (Fig. 11). Tighten the cover screw to secure the air filter cover.

NOTE:

Do not over tighten as this may strip the screw.

SPECIFICATIONS

CLEANING AND STORAGE

CLEANING

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.

WARNING:

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

clean or service it.

CAUSE

ACTION

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

Drain the fuel tank and add fresh, properly mixed fuel

Fouled spark plug

Replace or clean the spark plug

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

Drain the fuel tank and add fresh, properly mixed fuel

Cutting head bound with grass

Stop the engine and clean the cutting head

Dirty air filter

Clean or replace the air filter

Empty fuel tank

Fill fuel tank with properly mixed fuel

The primer bulb wasn't pressed enough

Press the primer bulb 10 times or until fuel is visible

Engine is flooded

With the choke lever in position 3, squeeze the trigger
and pull the starter rope

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

Drain the fuel tank and add fresh, properly mixed fuel

Fouled spark plug

Replace or clean the spark plug

Cutting head bound with grass

Stop the engine and clean cutting head

Cutting head out of line

Refill with new line

Inner reel bound up

Rewind the inner reel

Cutting head dirty

Clean inner reel and outer spool

Line welded

Disassemble, remove the welded section and rewind

Line twisted when refilled

Disassemble and rewind the line

Not enough line is exposed

Push the bump knob and pull out line until 4 inches (102 mm)
of line is outside of the cutting head

Oil, cleaner or lubricant in cutting head

Clean and thoroughly dry the cutting head

Air filter is plugged

Replace or clean the air filter

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

Drain the fuel tank and add fresh, properly mixed fuel

Improper idle speed

Adjust the idle speed

TROUBLESHOOTING

ENGINE WILL NOT START

ENGINE WILL NOT IDLE

ENGINE WILL NOT ACCELERATE

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

ENGINE LACKS POWER OR STALLS

CUTTING LINE ADVANCES UNCONTROLLABLY

CUTTING HEAD WILL NOT ADVANCE LINE

Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.10 in. (2.8 cm)
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 cc
Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6,800+ rpm
Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800 - 3,400 rpm
Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 in. (0.635 mm)
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Fuel/Oil Mixture
Fuel/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40:1
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14 fl. oz. (397 ml)
Approximate Unit Weight (without fuel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 13 lbs. (5 - 5.9 kg)
Cutting Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . .  4 Tooth Cutting Blade, Dual String Cutting Head
Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Single Quick Snap
Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.105 in. (2.66 mm)
Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 in. (45.72 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.

ELECTRIC STARTER AND POWER START BIT™ FEATURES

This unit is designed to be started with an optional electric starter or Power
Start Bit™, which are sold separately. If choosing to start the unit using
one of these features or have questions, please contact your local retailer
or call

1-800-828-5500

in the U.S. (

1-800-668-1238

in Canada) for more

information and purchasing. You may also go to

www.troybilt.com

www.troybilt.ca

OPTIONAL ACCESSORY

IDLE SPEED ADJUSTMENT

The idle speed of the engine is adjustable. An idle adjustment screw is between the air filter cover and
the engine starter housing (Fig. 35).

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. 35). 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. The correct air gap is

0.025

inch (0.635 mm)

. Remove the plug after every 25 hours of operation and check its condition.

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.

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. 36).

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

turning the 5/8-inch socket clockwise until snug.

If using a torque wrench torque to:

110-120 in.•lb. (12.3-13.5 N•m) Do not over tighten.

WARNING:

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

clean or service it.