Bolens 112-170-300 - Manual (Page 9)

3. Move engine control to SLOW. Turn idle ad­
j u s t i n g s c r e w u n t i l a f a s t i d l e i s
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.
MAINTENANCE
CUTTING BLADE
A. Removal for Sharpening or Replacement
J
WAR^G {
FIGURE 15.
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.
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.
LUBRICATION
IMPORTANT
Always stop engine and disconnect
spark
plug wire before cleaning,
lubricating or doing any kind of
work on lawn mower.
Wheels—Mower may be provided with ball bear­
ing 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.
Throttle—Periodically lubricate throttle control
lever and throttle wire assembly with a few drops
of light oil for ease of operation.
Protective Shield—The pivot points on the protec­
tive shield should be lubricated periodically with
light oil to prevent any rust or binding up.
Chute Deflector—The torsion spring and pivot
point should be lubricated periodically with light
oil to prevent any rust or binding up. Deflector
should work freely.
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, 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.
NOTE
It is recommended that the blade
always be removed from the adapter
for the best test of balance.
C. Reassembly
Before reassembling the blade and the blade
adapter to the unit, lubricate the engine
crankshaft and the inner surface of the blade
adapter with light oil. Lubricating the bolt holes,
bolts and inner surface of the nuts with light oil is
also recommended. A 4 oz. plastic bottle of light
oil
lubricant is available. Order part number
737-0170. Engine oil may also be used.