Bolens 122-336-120 - Manual (Page 12)

i v V A R N I N G {
If any adjustments are made to the
engine while the engine is running
(e.g.
carburetor), disengage all
clutches and blades. Keep clear of
all
moving parts. Be careful of
heated surfaces and muffler.
CARBURETOR ADJUSTMENTS (See Figure 22)
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 adjustment so that it will
not start, close the needle 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 counter­
clockwise 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 obtained (1750
R.P.M.).
4. To check adjustment, move engine control
from SLOW to FAST speed. Engine should ac­
celerate smoothly. If engine tends to stall or
die out, increase idle speed or readjust car­
buretor, usually to a slightly richer mixture.
FIGURE 22.
LUBRICATION
IMPORTANT
Always stop engine and disconnect
spark
plug wire before cleaning,
lubricating or doing any kind of work
on lawn mower.
Wheels—Front and rear wheel bearings are of
self-lubricating Fortiflex. They require no lubrica­
tion. 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.
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.
Discharge Chute Door Mechanism—The torsion
spring and pivot point should be lubricated
periodically with light oil to prevent any rust or
binding. Doors must work freely.
Bronze Bearings—Periodically lubricate all
bronze bearings with a few drops of light oil to
minimize friction.
MAINTENANCE
CUTTING BLADE
A. Removal for Sharpening or Replacement
I WARNING I
Be sure to disconnect and ground
the spark plug wire before working
on
the cutting blade to prevent
accidental engine starting.
12