Troy-Bilt TB20CS Manual Del Operador página 4

STARTING/STOPPING INSTRUCTIONS
WARNING:
Remove fuel cap slowly to avoid injury from fuel spray. Never
operate the unit without the fuel cap securely in place.
WARNING: Avoid accidental starting. Make sure you are in the starting position
when pulling the starter rope (Fig. 8). To avoid serious injury, the operator and unit
must be in a stable position while starting.
STARTING INSTRUCTIONS
1. Mix gas with oil. Fill fuel tank with fuel/oil mixture. See Oil and Fuel Mixing Instructions.
WARNING:
DO NOT USE E85 FUEL IN THIS UNIT. It has been proven
that fuel containing greater than 15% ethanol will likely damage this engine
and void the warranty.
2. 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. 7). If you can't see fuel in the bulb, press and
release the bulb as many times as it takes before you can see fuel in it.
3. Place the blue choke lever in Position 1 (Fig. 7).
4. Crouch in the starting position (Fig. 8), squeeze the throttle control, and pull the starter
rope out with a controlled and steady motion 5 times.
NOTE: The unit uses Spring Assist Starting™, which significantly reduces the effort required
to start the engine. You must pull the starter rope out far enough to hear the engine
attempt to start. There is no need to pull the rope briskly—there is no harsh
resistance when pulling. Be aware that this starting method is vastly different from
(and much easier than) what you may be used to.
5. Place the blue choke lever in Position 2 (Fig. 7).
6. While squeezing the throttle control, pull the starter rope out with a controlled and steady
motion until the engine starts.
7. Keep the throttle squeezed and allow the engine to warm up for 30 to 60 seconds.
NOTE: Engine may take longer to warm up and reach maximum operating speed at colder
temperatures.
NOTE: Unit is properly warmed up when engine accelerates without hesitation.
8. Place the blue choke lever in Position 3 (Fig. 7).
9. Keep the throttle squeezed and allow the engine to warm up for an additional 60 seconds.
The unit is ready for use.
IF... the engine hesitates, return the blue choke lever to Position 2 (Fig. 7) and continue warm-up.
IF... the engine does not start, go back to step 2.
IF... the engine fails to start after a few attempts, place the blue 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, start the unit with the blue choke lever in Position 2. After the unit starts, move the blue
choke lever to Position 3.
STOPPING INSTRUCTIONS
1. Release your finger from the throttle control. Allow the engine to cool down by idling.
2. Press and hold On/Off Stop Control in the OFF (O) position until engine comes to a complete stop (Fig. 9).
MAINTENANCE SCHEDULE
WARNING: To prevent serious injury, never perform maintenance or repairs with unit running. Always service and repair a cool
unit. Disconnect the spark plug wire to ensure that the unit cannot start.
Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be a part of any
seasonal tune-up.
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures take your unit to any
non-road engine repair establishment, individual or authorized service dealer.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any non-road engine repair
establishment, individual or authorized service dealer.
In order to assure peak performance of your engine, inspection of the engine exhaust port may be necessary after 50 hours of operation. If you
notice lost RPM, poor performance or general lack of acceleration, this service may be required. If you feel your engine is in need of this inspection,
refer service to any non-road engine repair establishment, individual or authorized service dealer for repair. DO NOT attempt to perform this process
yourself as engine damage may result from contaminants involved in the cleaning process for the port.
FREQUENCY
Before starting engine Fill fuel tank with fresh fuel
Every 10 hours Clean and re-oil air filter
Check and clean spark arrestor
Every 25 hours
Check spark plug condition and gap
Inspect exhaust port and spark arrestor screen for clogging or obstruction to assure
Every 50 hours
maximum performance levels.
*
DO NOT use E85 fuel in this unit. It has been proven that fuel containing greater than 15% ethanol will likely damage this engine and
void the warranty.
LINE INSTALLATION
WARNING: Never use metal-reinforced line, wire, chain or rope. These can break off
and become dangerous projectiles.
This section covers both SplitLine™ and standard single line installation.
Always use original equipment manufacturer 0.095 in. (2.41 mm) replacement line. Line other than
the specified may make the engine overheat or fail.
There are two methods to replace the trimming line:
• Wind the inner reel with new line
• Install a prewound inner reel
Removing the Existing Inner Reel
1. Hold the outer spool with one hand and unscrew the Bump Knob™ counterclockwise (Fig. 13).
Inspect the bolt inside the Bump Knob to make sure it moves freely. Replace the Bump Knob if
damaged.
2. Remove the inner reel from the outer spool (Fig. 14).
3. Remove spring from the inner reel (Fig. 14).
4. Use a clean cloth to clean the the inner reel, spring, shaft, and inner surface of the outer spool.
5. Check the indexing teeth on the inner reel and outer spool for wear (Fig. 15). If necessary,
remove burrs or replace the reel and spool.
NOTE: Always use the correct line length when installing trimming line on the unit. The line may not
release properly if the line is too long.
Single Line Installation
Go To Step 8 for SplitLine™ Installation:
6. Take approximately 20 feet (6 m) of new trimming line,
loop it into two equal lengths. Insert each end of the
line through one of the two holes in the inner reel (Fig.
16). Pull the line through the inner reel so that the loop
is as small as possible.
7. Wind the lines in tight even layers, onto the reel (Fig.
17). Wind the line in the direction indicated on the inner
reel. Place your index finger between the two lines to
stop the lines from overlapping. Do not overlap the
ends of the line. Proceed to step 12.
SplitLine™ Installation
8. Take approximately 10 feet (3 m) of new trimming line.
Insert one end of the line through one of the two holes
in the inner reel (Fig. 18). Pull the line through the inner
reel until only about 4 inches is left out.
9. Insert the end of the line into the open hole in the inner
reel and pull the line tight to make the loop as small as
possible (Fig. 18).
10. Before winding, split the line back about 6 inches.
11. Wind the line in tight even layers in the direction
indicated on the inner reel.
NOTE: Failure to wind the line in the direction indicated will
cause the cutting head to operate incorrectly.
12. Insert the ends of the line into the two holding slots (Fig. 19).
13. Insert the ends of the line through the eyelets in the
outer spool and place inner reel with spring inside the
outer spool (Fig. 20). Push the inner reel and outer
spool together.
NOTE: The spring must be assembled on the inner reel
before reassembling the cutting head.
14. Hold the inner reel in place and install the bump knob
by turning clockwise. Tighten securely.
15. Grasp the ends and pull firmly to release the line from
the holding slots in the reel.
INSTALLING A PREWOUND REEL
1. Hold the outer spool with one hand and unscrew the
bump knob counterclockwise (Fig. 13). Inspect the bolt
inside the bump knob to make sure it moves freely. Replace the bump knob if damaged.
2. Remove the old inner reel from the outer spool (Fig. 14).
3. Remove the spring from the old inner reel (Fig. 14).
4. Place the spring in the new inner reel.
NOTE: The spring must be assembled on the inner reel before reassembling the cutting head.
5. Insert the ends of the line through the eyelets in the outer spool (Fig. 20).
6. Place the new inner reel inside the outer spool. Push the inner reel and outer spool together.
While holding the inner reel and outer spool, grasp the ends and pull firmly to release the line
from the holding slots in the spool.
7. Hold the inner reel in place and install the bump knob by turning clockwise. Tighten securely.
INSTALLATION OF THE SPEEDLOCK™
Removing the Existing Inner Reel
Refer to Removing the Existing Inner Reel in the Maintenance and Repair Insturctions section that can
be found in the operator's manual.
Installing the SpeedLock™
1. After removing the inner reel, place the SpeedLock™ onto the shaft, making sure to align the arrows
with the eyelets in the outer spool (Fig. 21).
2. Place the spring over the shaft and into the recess in
the SpeedLock™ Spool (Fig. 21).
3. While holding the outer spool in place, insert the bolt
located in the Bump Knob™ through the end of the
spring and into the end of the shaft (Fig. 21).
4. While slightly compessing the spring, screw the Bump
Knob™ clockwise into the shaft (Fig. 21). Tighten Securely.
Installing the Trimming Line
1. Align the arrows on the SpeedLock™ with the eyelets
on the outer spool (Fig. 22).
2. Insert a piece of precut spiral line, P/N 49UFSHLL953,
into an eyelet on the outer spool (Fig. 22).
4
Position 1
Fig. 7
Trimmer
Equipped With
Spring Assist
Starting ™
Throttle Control
Fig. 8
Stop/Off (O)
Start/On (I)
Fig. 9
MAINTENANCE AND REPAIR INSTRUCTIONS
MAINTENANCE REQUIRED
Fig. 13
Fig. 14
Indexing Teeth
Fig. 15 Fig. 16
Fig. 18
Fig. 17
Index Teeth
Eyelets
Spring
Fig. 19
Fig. 20
Outer Spool
SpeedLock™
Shaft
Eyelet
Fig. 21
Trimmer
Line
Arrow
Eyelet
Trimmer
Line
Fig. 22 Fig. 23
Position 3
HOLDING THE TRIMMER
WARNING:
Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit.
Position 2
Before operating the unit, stand in the operating position (Fig. 10). Check for the following:
Blue Choke
Lever • The operator is wearing eye protection and proper clothing
• With a slightly-bent right arm, the operator's hand is holding the shaft grip
Primer Bulb
• The operator's left arm is straight, the left hand holding the D-handle
• The unit is at waist level
• The cutting head is parallel to the ground and easily contacts the grass without the need to
bend over
Starting
Position ADJUSTING TRIMMING LINE LENGTH
CAUTION:
Do not remove or alter the line cutting blade assembly. Excessive line
length will make the unit overheat. This may lead to serious personal injury or damage
to the unit.
The Bump Head™ cutting head allows you to release trimming line without stopping the engine. To
release more line, lightly tap the cutting head on the ground (Fig. 11) while operating the trimmer at
high speed.
NOTE: Always keep the trimming line fully extended. Line release becomes more difficult when
the cutting line gets shorter.
Each time the head is bumped, about 1 inch (25.4 mm) of trimming line releases. A blade in the
cutting head shield will cut the line to the proper length if any excess line is released.
For best results, tap the bump knob on bare ground or hard soil. If you attempt a line release in tall
grass, the engine may stall. Always keep the trimming line fully extended. Line release becomes
more difficult when the cutting line gets shorter.
NOTE: Do not rest the Bump Head™ on the ground while the unit is running.
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
Throttle
• Attempting to cut thick, stalky weeds
Control
• Forcing the line into objects such as walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
• Keep the cutting head parallel to the ground.
• Do not force the cutting head. Allow the tip of the line to do the cutting, especially along walls. Cutting with more than the tip will
reduce cutting efficiency and may overload the engine.
• Cut grass over 8 inches (200 mm) by working from top to bottom in small increments to avoid premature line wear or engine drag.
• Cut from right to left whenever possible. Cutting to the left improves the unit's cutting efficiency. Clippings are thrown away from the operator.
• Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward-backward or side-to-side motion.
Cutting shorter lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon:
• Following the trimming techniques
• What vegetation is being cut
• Where vegetation is cut
For example, the line will wear faster when trimming against a foundation wall as opposed to
trimming around a tree.
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all vegetation around trees, posts, fences and more.
Rotate the whole unit so that the cutting head is at a 30° angle to the ground (Fig. 12).
3. Push the line into the SpeedLock™ until it starts to show
from the opposite side.
4. Adjust the line so that both ends are of equal length (Fig. 23).
5. While holding the outer spool in place, pull the
SpeedLock™ away from the outer spool and twist the
SpeedLock™ clockwise until the dot is inline with the
eyelet or until it stops (Fig. 24).
6. Release the SpeedLock™ so that it snaps into place.
7. Check that the SpeedLock™ has seated completely
into the outer spool. If it has not, repeat steps 5 thru 7.
Removing the Trimming Line
1. While holding the outer spool in place, pull the
SpeedLock™ away from the outer spool and twist the
SpeedLock™ counterclockwise until it stops. The arrows
should align with the eyelets on the outer spool. (Fig. 22).
2. Release the SpeedLock™.
NOTE: The SpeedLock™ should stand about 1/4 of an inch
SEE
above the outer spool.
3. Firmly pull one end of the trimming line until the whole
p. 3
piece exits the outer spool.
p. 4
REMOVING THE SPEEDLOCK™
p. 4
1. While holding the outer spool in place, turn the Bump
p. 4
Knob™ counterclockwise until it completely unscrews
from the shaft.
p. 4
2. Remove the spring.
3. Remove the SpeedLock™.
AIR FILTER MAINTENANCE
WARNING:
To avoid serious personal
Bump Knob™
injury, always turn your trimmer off and allow
it to cool before you clean or service it.
Bolt
Removing the Air Filter/Muffler Cover
1. Place the blue choke lever in Position 2 (Fig. 25).
NOTE: The blue choke lever must be in Position 2 to
remove the air filter/ muffler cover.
2. Remove the four (4) screws securing the air filter/muffler cover (Fig. 25). Use a T-20 Torx bit
screwdriver.
3. Pull the cover from the engine. Do not force.
Cleaning the Air Filter
Clean and re-oil the air filter every 10 hours of operation. It is an important item to maintain. Failure
Outer Spool to maintain your air filter properly can result in poor performance or can cause permanent damage
to your engine.
1. Remove air filter/muffler cover. Refer to Removing the Air Filter/Muffler Cover.
2. Turn cover over and look inside to locate the air filter. Remove the air filter from inside the air
filter/muffler cover (Fig. 26).
3. Wash the filter in detergent and water (Fig. 27). Rinse the filter thoroughly. Squeeze out excess
Spring
water. Allow it to dry completely.
4. Apply enough clean SAE 30 oil to lightly coat the filter (Fig. 28).
Inner Reel
5. Squeeze the filter to spread and remove excess oil (Fig. 29).
6. Replace the air filter inside the air filter/muffler cover (Fig. 26).
NOTE: Operating the unit without the air filter and air filter/muffler cover assembly will VOID the warranty.
Reinstalling the Air Filter/Muffler Cover
1. Place the air filter/muffler cover over the back of the carburetor and muffler. Align the screw holes.
2. Insert the four (4) screws into the holes in the air filter/muffler cover (Fig. 25) and tighten. Do not over tighten.
SPARK ARRESTOR MAINTENANCE
1. Remove air filter/muffler cover. Refer to Removing the Air Filter/Muffler Cover.
2. Locate the muffler, but do not remove it. Find the screw on the bottom of the muffler (Fig. 30). Remove the screw using either a Torx
T20 or flat blade screwdriver.
3. Carefully pry up the left side spark arrestor hood. Two tabs act as hinges on the right side of the hood. Flip open the spark arrestor
hood like a door and then pull its tabs out of the muffler slots.
4. Using a small flat blade screwdriver, carefully pry the spark arrestor screen out from the inside of the spark arrestor hood.
Loop
5. Clean the spark arrestor screen with a wire brush. Replace it if it is damaged, or if you are unable to clean it thoroughly.
6. Reinstall the spark arrestor screen snugly back into the spark arrestor hood.
7. Reinstall the two hood tabs into the two muffler slots and flip the spark arrestor hood closed.
8. Replace the screw you removed in Step 2 and tighten it securely.
9. Reinstall the air filter/muffler cover.
CARBURETOR ADJUSTMENT
WARNING: If the spark arrestor hood and spark arrestor screen are not tightened securely, they could fall off causing
damage to the unit and possible serious personal injury.
The idle speed of the engine is adjustable through the air filter/muffler cover (Fig. 31).
Loop NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should
make carburetor adjustments.
Check Fuel Mixture
Old and/or improperly mixed fuel is usually the reason for improper unit performance. Drain and
refill the tank with fresh, properly-mixed fuel prior to making any adjustments. Refer to Oil and Fuel
Information.
Clean Air Filter
The condition of the air filter is important to the operation of the unit. A dirty air filter will restrict air
flow and change the air/fuel mixture. This is often mistaken for an out of adjustment carburetor.
Check the condition of the air filter before adjusting the idle speed screw. Refer to Air Filter
Maintenance.
Adjust Idle Speed Screw
WARNING:
The cutting head will spin during idle speed adjustments. Wear protective clothing and observe all safety
instructions to prevent serious personal injury.
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 let it run at a high idle for a minute to warm up. Refer to Starting/Stopping Instructions.
2. Release the throttle trigger and let the engine idle. If the engine stops, insert a small phillips screwdriver into the hole in the air
filter/muffler cover (Fig. 31). Turn the idle speed screw in, 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
Spring
Bump
WARNING:
Do not sand blast, scrape or clean electrodes. Grit in the engine
Recess
Knob™
could damage the cylinder.
Even
Use replacement #791-610311B, a Champion RDJ7Y 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.
Cutting Head
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. 32).
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.
OPERATING INSTRUCTIONS
SpeedLock™
Dot
Eyelet
Fig. 24
Air Filter
Inside Muffler Cover
Fig. 26
Fig. 28
Fig. 10
Fig. 11
Fig. 12
Blue Choke
Lever
Position 2
Screws
Screws
Fig. 25
Fig. 27
Fig. 29
Slots Engine
Spark
Muffler
Arrestor
Hood
Spark Arrestor
Screw
Tabs Screen
Fig. 30
Idle Speed Screw
Fig. 31
0.025 in.
(0.635 mm)
Fig. 32