MTD Yard Machines LT31, Руководство оператора

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Adjust Idle Speed Screw
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. 66).
Turn the idle speed screw in, clockwise, 1/8 of a
turn at a time (as needed) until the engine idles
smoothly.
NOTE: For the LT31C & LT31CS, the cutting attachment
should not rotate when the engine idles.
3. LT31: 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.
LT31C & LT31CS: If the cutting attachment rotates
when the engine idles, turn the idle speed screw
counterclockwise 1/8 of a turn at a time (as
needed), to reduce idle speed.
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.
Fig. 66
Checking the fuel mixture, cleaning the air filter, and
adjusting the idle speed should solve most engine
problems. If not and:
• 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 a Champion RDJ7Y spark plug, or equivalent. The
correct air gap is 0.5 mm (0.020 inch). 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 0.5 mm (0.020 inch) using a feeler
gauge (Fig. 67).
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:
12.3-13.5 N•m (110-120 in.•lb.)
Do not over tighten.
0.020 in.
(0.5 mm)
Fig. 67
MAINTENANCE AND REPAIR INSTRUCTIONS
The cutting
attachment may spin
during idle speed adjustments. Wear
protective clothing and observe all safety
instructions to prevent serious personal injury.
WARNING:
To prevent serious
personal injury,
make sure the cutting attachment has
stopped rotating before you turn it off and
set it down.
WARNING:
Do not sand blast,
scrape or clean
electrodes. Grit in the engine could damage
the cylinder.
WARNING:
Idle Speed Screw