Bolens 111-338A - Manual (Page 12)

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
adjusting 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 accelerate smoothly. If engine tends
to stall or die out increase idle speed or re­
adjust carburetor, usually to a slightly richer
mixture.
MAINTENANCE
LUBRICATION
IMPORTANT
Always stop engine and disconnect
spark plug wire before cleaning,
lubricating or doing any kind of
work on lawn mower.
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.
Wheels—Mower is provided with ball bearing
wheels. Lubricate at least once a season with light
oil. Also, 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 mangal 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.
^ WARNING
\
Be sure to disconnect and ground
the spark plug wire before perform­
ing any repairs or maintenance.
CUTTING BLADE
To remove the cutting blade for sharpening or
replacement, remove the two hex nuts and lock
washers which hold the blade to the blade
brake/clutch. See figure 18.
FIGURE 18.
When sharpening the blade, follow the original
angle of grind as a guide. It is extremely important
that each cutting edge receives an equal amount
of grinding to prevent an unbalanced blade. An un­
balanced blade will cause excessive vibration
when rotating at high speeds, may cause damage
to the mower and could break, causing personal
injury.
The blade can be tested for balance by balancing
it on a round shaft screwdriver. Remove metal
from the heavy side until it balances evenly.
When replacing the blade, be sure to install the
blade with the side of the blade marked “Bottom”
(or with part number) facing the ground when the
mower is in the operating position.
Blade Mounting Torque
3/8" Dia. Nuts 275 in. lb. min., 330 in. lb. max.
To insure safe operation of your unit, ALL nuts
and bolts must be checked periodically for correct
tightness.
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