Maintenance; Service And Adjustments - McCulloch MT 250 LK Operator's Manual

CUTTING METHODS
WARNING:
Use minimum speed and
do not crowd the line when cutting around
hard objects (rock, gravel, fence posts, etc.),
which can damage the trimmer head, become
entangled in the line, or be thrown causing a
serious hazard.
S The tip of the line does the cutting. You will
achieve the best performance and mini-
mum line wear by not crowding the line into
the cutting area. The right and wrong ways
are shown below.
Tip of the Line Line Crowded Into
Does The Cutting Work Area
Right Wrong
S The line will easily remove grass and
weeds from around walls, fences, trees and
flower beds, but it also can cut the tender
bark of trees or shrubs and scar fences.
S For trimming or scalping, use less than full
throttle to increase line life and decrease
head wear, especially:
S During light duty cutting.
S Near objects around which the line can-
wrap such as small posts, trees or fence
wire.
S For mowing or sweeping, use full throttle for
a good clean job.
TRIMMING - - Hold the bottom of the trimmer
head about 80 mm above the ground and at an
angle. Allow only the tip of the line to make con-
tact. Do not force trimmer line into work area.
Trimming
3 in. (8 cm)
Above Ground
SCALPING - - The scalping technique removes
unwanted vegetation. Hold the bottom of the
trimmer head about 80 mm above the ground
and at an angle. Allow the tip of the line to strike
the ground around trees, posts, monuments,
etc. This technique increases line wear.
Scalping
MOWING - - Your trimmer is ideal for mowing
in places conventional lawn mowers cannot
reach. In the mowing position, keep the line
parallel to the ground. Avoid pressing the
head into the ground as this can scalp the
ground and damage the tool.
Mowing
SWEEPING - - The fanning action of the rotat-
ing line can be used for a quick and easy
clean up. Keep the line parallel to and above
the surfaces being swept and move the tool
from side to side.
Sweeping
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MAINTENANCE

WARNING:
Disconnect the spark
plug before performing maintenance except
for carburetor adjustments.
CHECK FOR LOOSE
FASTENERS AND PARTS
S Spark Plug Boot
S Air Filter
S Housing Screws
S Assist Handle Screw
S Debris Shield
CHECK FOR DAMAGED OR
WORN PARTS
Contact an authorized service dealer for re-
placement of damaged or worn parts.
S ON/STOP Switch - - Ensure ON/STOP switch
functions properly by moving the switch to the
STOP position. Make sure engine stops; then
restart engine and continue.
S Fuel Tank - - Discontinue use of unit if fuel
tank shows signs of damage or leaks.
S Debris Shield - - Discontinue use of unit if
debris shield is damaged.
INSPECT AND CLEAN UNIT AND
LABELS
S After each use, inspect complete unit for
loose or damaged parts. Clean the unit and
labels using a damp cloth with a mild deter-
gent.
S Wipe off unit with a clean dry cloth.
CLEAN AIR FILTER
A dirty air filter decreases engine perform-
ance and increases fuel consumption and
harmful emissions. Always clean after every
5 hours of operation.

SERVICE AND ADJUSTMENTS

REPLACING THE LINE
1. Press the tabs on the side of the trimmer
head and remove cover and spool.
1. Clean the cover and the area around it to
keep dirt from falling into the carburetor
chamber when the cover is removed.
2. Remove parts as illustrated.
NOTE:
Do not clean filter in gasoline or other
flammable solvent to avoid creating a fire haz-
ard or producing harmful evaporative emis-
sions.
3. Wash the filter in soap and water.
4. Allow filter to dry.
5. Replace parts.
Button
Air Filter
Air Filter Cover
REPLACE SPARK PLUG
Replace the spark plug each year to ensure
the engine starts easier and runs better. Set
spark plug gap at 0,6 mm. Ignition timing is
fixed and nonadjustable.
1. Twist, then pull off spark plug boot.
2. Remove spark plug from cylinder and dis-
card.
3. Replace with Champion RCJ-6Y spark
plug and tighten securely with a 19 mm
socket wrench.
4. Reinstall the spark plug boot.
Tab
Tab
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