MTD 111-020-300 - Manual (Page 8)

CARBURETOR ADJUSTMENTS (See Figure 11)
Minor carburetor adjustment may be required to
compensate for differences in fuel, temperature,
altitude and load.
All carburetor adjustments should be made with
the air cleaner on engine. Air cleaner mounting
screw must be in carburetor when engine is run.
Best adjustment is made with a fuel tank half full
of gasoline.
To Adjust Carburetor:
1. Start engine and run long enough to warm it to
operating temperature. If engine is out of ad­
justment so that it will not start, close the nee­
dle valve by turning it clockwise. Then open
needle valve 1-1/2 turns counterclockwise.
2. Move engine control to run engine at normal
operating speed.
a. Turn needle valve in clockwise until engine
starts to lose speed (lean mixture).
b. Then slowly turn needle valve out
counterclockwise past the point of
smoothest operation until engine just
begins to run unevenly (rich mixture).
c. Turn needle valve back in clockwise very
slowly till engine runs evenly.
d. Final adjustment of the needle valve
should be slightly to the rich side (turn
counterclockwise) of the mid-point.
3. Move engine control to SLOW. Turn idle ad­
justing screw until a fast idle is ob­
tained—(1750 R.P.M.).
4. To check adjustment, move engine control
from SLOW to FAST speed. Engine shouid ac­
celerate smoothly. If engine tends to stall or
die out, increase idle speed or readjust car­
buretor, usually to a slightly richer mixture.
LUBRICATION
IMPORTANT
Always stop engine and disconnect
spark plug wire before cleaning,
lubricating or doing any kind of
work on lawn mower.
Wheels— The wheels require no lubrication.
However, if the wheels are removed for any
reason, lubricate the surface of the axle bolt and
the inner surface of the wheel with light oil. A 4 oz.
plastic bottle of light oil lubricant is available.
Order part number 737-0170. Engine oil may also
be used.
Protective Shield— The pivot points on the protec­
tive shield should be lubricated periodically with
light oil to prevent any rust or binding.
Chute Deflector— The torsion spring and pivot
point should be lubricated periodically with light
oil to prevent any rust or binding. Deflector must
work freely.
Engine— Follow engine manual for lubrication in­
structions.
Throttle— Periodically lubricate throttle control
lever and throttle wire assembly with a few drops
of light oil for ease of operation.
MAINTENANCE
WARNING i
Disconnect spark plug wire
and ground it against the engine
before
performing any repairs
or maintenance.
CUTTING BLADE
A. Removal for Sharpening or Replacement
^ WARNING {
FIGURE 11.
Be sure to disconnect and ground
the spark plug wire before working
on the cutting blade to prevent
accidental engine starting.
1. Remove the large bolt and lock washer which
holds the blade and adapter to the engine
crankshaft.
2. Remove the blade and adapter from the
crankshaft. Be careful not to lose the key on
the crankshaft.