Troy-Bilt TB515 EC, Operator'S Manual

Page: 6 / 24

SPARK ARRESTOR MAINTENANCE
1. Remove the rear engine cover. See Rocker Arm Clearance.
2. With a flat blade screwdriver or Torx T-20 bit and a T-25 bit,
remove the screws attaching the spark arrestor cover to the
muffler (Fig. 33).
3. Pull the tab on the spark arrestor cover out of the muffler.
Remove the spark arrestor cover.
4. Remove the spark arrestor screen from the spark arrestor
cover.
5. Clean the spark arrestor screen with a wire brush or replace it.
6. Reinstall the spark arrestor screen, spark arrestor cover and
screws.
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 the unit with fuel in the tank where fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Lock up the unit to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
LONG TERM STORAGE
1. Drain all gasoline from the gas tank into a container. Do not use gas that has been stored for more
than 60 days. Dispose of the old gasoline in accordance to Federal, State, and Local regulations.
2. Start the engine and allow it to run until it stalls. This ensures that all gasoline has been drained from
the carburetor.
3. Allow the engine to cool. Remove the spark plug and put 5 drops of high quality motor 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
edger after storage.
4. Change the oil, referring to Changing the Oil. Dispose of the old oil in accordance to Federal, State
and Local regulations.
5. Thoroughly clean the unit and inspect for any loose or damaged parts. Repair or replace damaged
parts and tighten loose screws, nuts or bolts. The unit is ready for storage.
TRANSPORTING
• Allow the engine to cool before transporting.
• Secure the unit while transporting.
• Drain the gas tank before transporting.
• Tighten gas cap before transporting.
6
CARBURETOR 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. 27).
NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should make
carburetor adjustments.
Check Fuel
Old fuel is usually the reason for improper unit performance. Drain and refill the tank with fresh fuel prior to
making any adjustments. Refer to Oil and Fuel Information.
Adjust Idle Speed Screw
If, after checking the fuel 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. Move the throttle control lever to the Slow position ( ) and
let the engine idle. If the engine stops, insert a
small phillips in between the Air Filter Cover and the Engine Cover (Fig. 27).
NOTE: Do not engage the Blade Clutch Lever while adjusting the idle speed screw to ensure that the
blade will not rotate.
3. Turn the idle speed screw in, clockwise , 1/8 of a turn at a time (as needed) until the engine idles
smoothly.
Checking the fuel, 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.
ROCKER ARM CLEARANCE
This requires disassembly of the engine. If you feel unsure or
unqualified to perform this, take the unit to an authorized service
center.
NOTE: Inspect the valve to rocker arm clearance with a feeler
gauge after the first 10 hours of operation and every 25
hours of operation.
• The engine must be cold when checking or adjusting the valve
clearance.
• This task should be performed inside, in a clean, dust free
area.
1. Remove the six (6) screws on the back of the engine cover
with a Flat-head or T-25 Torx screwdriver (Fig. 28).
2. Disconnect the spark plug wire.
3. Clean dirt from around the spark plug. Remove the spark plug
from the cylinder head by turning a 5/8 in. socket
counterclockwise.
4. Remove the engine cover (Fig. 28).
5. Clean dirt from around the rocker arm cover. Remove the
screw holding the rocker arm cover with a large flat blade
screwdriver or Torx T-25 bit (Fig. 29). Remove the rocker arm
cover and gasket.
6. Pull the starter rope slowly to bring the piston to the top of its
travel, (known as top dead center). Check that:
• The piston is at the top of its travel while looking in the spark
plug hole (Fig. 30)
• Both rocker arms move freely, and both valves are closed
If these statements are not true, repeat this step.
7.
Slide the feeler gauge between the rocker arm and the valve
return spring. Measure the clearance between the valve stem
and rocker arm (Fig. 30). Measure both the intake and exhaust
valves.
The recommended clearance for both intake and exhaust is
.003 – .006 in. (.076 – 0.152 mm) . Use a standard automotive
.005 in. (0.127 mm) feeler gauge. The feeler gauge should slide
between the rocker arm and valve stem with a slight amount of
resistance, without binding. See Figures 30 and 31.
8.
If the clearance is not within specification:
a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or
nut driver (Fig. 30).
• To increase clearance, turn the adjusting nut
counterclockwise.
• To decrease clearance, turn the adjusting nut
clockwise.
b. Recheck both clearances, and adjust as necessary.
9. Reinstall the rocker arm cover using a new gasket. Torque the
screw to
20–30 in•lb (2.2–3.4 N•m) .
10. Check the spark plug and reinstall. See Replacing the Spark Plug.
11. Replace the spark plug wire.
12. Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.
REPLACING THE SPARK PLUG
Use a replacement part number 753-05255 spark plug. The correct air gap is 0.025 in. (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. Remove the six (6) screws on the back of the engine cover with a
Flat-head or T-25 Torx screwdriver (Fig. 28).
2. Grasp the plug wire firmly and pull the cap from the spark plug.
3. Clean dirt from around the spark plug. Remove the spark plug from
the cylinder head by turning a 5/8 in. socket counterclockwise.
4. Replace cracked, fouled or dirty spark plug. Set the air gap at
0.025 in. (0.635 mm) using a feeler gauge (Fig. 32).
5. Install a correctly-gapped spark plug in the cylinder head.
Turn the 5/8 in. 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.
ACCESSORIES/REPLACEMENT PARTS
Blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 753-05562
Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 753-05549
Use only original Troy-Bilt replacement parts.
Fig. 27
Idle
Adjustment
Screw
WARNING:
To prevent serious personal
injury, make sure the blade has stopped rotating
before you turn it off.
Fig. 28
Fig. 29
Fig. 30
Remove
Screws
Remove
Screws
Rocker Arm
Cover
Spark
Plug Hole
Adjusting
Nuts
Feeler Gauge
Rocker Arms INTAKE
EXHAUST
Spark Plug Hole
Fig. 31
Rocker
Arm
.003–.006 in.
(.076–.152 mm)
Adjusting Nut
Feeler
Gauge
Intake
Valve Stem
Exhaust
Valve Stem
Fig. 32
0.025 in.
(0.635 mm)
WARNING:
Do not sand blast, scrape or
clean electrodes. Grit in the engine could
damage the cylinder.
Fig. 33
Spark Arrestor Screen
Diverter
T-25 Screw
T-20 Screw
Muffler
Slot
WARNING:
To avoid serious personal injury, always turn your unit off and allow it to
cool before you clean or service it.
MAINTENANCE AND REPAIR INSTRUCTIONS MAINTENANCE AND REPAIR INSTRUCTIONS
ELECTRIC STARTER AND POWER START BIT™ FEATURES
This unit is designed to be started with an optional electric starter or Power Start Bit™ that 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 U.S, (1-800-668-1238 Canada) , for more information and
purchasing. You may also go to www.troybilt.com or www.troybilt.ca .
Electric Start Feature