MTD 111-638A - Manual (Page 13)

2. Move throttle control lever on handle to
“FAST” position.
3. Move lever to which control wire is fastened
at engine to full open position. Retighten
screw to secure throttle control wire
assembly.
i WARNING
I
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 (Refer to engine
manual for adjustments.)
LUBRICATION
IMPORTANT
Always stop engine and disconnect
spark plug wire before cleaning,
lubricating or doing any kind of
work on lawn mower.
Wheels—The wheel bearings should be lubri­
cated at least once a season. 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 lubri­
cant 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.
MAINTENANCE
CUTTING BLADE
A. Removal for Sharpening or Replacement
^ WARNING \
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. See figure 25.
FIGURE 25.
2. Remove the blade and adapter from the
crankshaft. Be careful not to lose the key op
the crankshaft.
3. If the blade or blade adapter needs replacing,
remove the two small bolts, lock washers and
nuts which hold the blade to the adapter.
B. Sharpening
Remove the cutting blade by following the direc­
tions of the preceding section.
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 and may cause
damage to the mower.
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. See
figure 26.
NOTE
It is recommended that the blade
always be removed from the adapter
for the best test of balance.
13