Craftsman 917.388933 Manual De Uso página 12

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LAWN MOWER
Alwaysobservesafety ruleswhen per-
formingany maintenance.
TIRES
• Keep tires free of gasoline,oil, or insect
controlchemicalswhichcan harmrubber.
• Avoid stumps,stones, deep ruts, sharp
objectsand other hazardsthat may
causetire damage.
BLADE CARE
Forbest results,mowerblademustbe kept
sharp. Replacebentor damagedblades.
A CAUTION: Useonly a replacement
bladeapprovedby the manufacturerof
your mower. Usinga blade not approved
by the manufacturerof your moweris
hazardous,could damageyour mowerand
void your warranty.
TO REMOVEBLADE
1. Disconnectspark plug wire fromspark
plug and placewire where it cannot
come in contactwith plug.
2. Turn lawn moweron its side. Make
sure air filter andcarburetorare up.
3. Use a wood blockbetweenblade and
mowerhousingto preventbladefrom
turningwhen removingbladebolt.
NOTE: Protectyour handswith gloves
and/orwrap bladewith heavycloth.
4. Removeblade bolt by turning counter-
clockwise.
5. Removeblade and attachinghardware
(bolt,lockwasherandhardened washer).
TO REPLACEBLADE
1. Positionbladeon the bladeadapter
aligningthe two (2) holes in the blade
with the raisedlugs on the adapter.
2. Besure the trailingedge of blade(oppo-
site sharpedge)is uptowardthe engine.
3. Installthe blade boltwith the lock
washer and hardenedwasher into
blade adapterand crankshaft.
4. Use blockof wood betweenbladeand
lawn mowerhousingand tightenthe
blade bolt,turning clockwise.
• The recommendedtighteningtorque is
35-40ft. Ibs.
Blade adapter
Key __
Lockwasher
_
Blade
bolt
Hardened
washer
""
IMPORTANT:
Blade bolt is heat treated.
If bolt needs
replacing,
replace
only with
approved
bolt shown
in the Repair
Parts
section
of this manual.
TO SHARPEN
BLADE
NOTE:
We do not recommend
sharp-
ening the blade - but if you do, be sure
the blade is balanced.
An unbalanced
blade will cause eventual
damage
to lawn
mower
or engine.
• The blade can be sharpened
with a file
or on a grinding
wheel.
Do not attempt
to sharpen
while on the mower.
• To check blade balance,
drive a nail into
a beam or wall. Leave
about one inch of
the straight
nail exposed.
Place center
hole of blade over the head of the nail.
If blade is balanced,
it should
remain
in
a horizontal
position.
If either end of the
blade moves
downward,
sharpen
the
heavy end until the blade is balanced.
GRASS
CATCHER
• The grass catcher
may be hosed with
water,
but must be dry when used.
• Check your grass catcher
often for dam-
age or deterioration.
Through
normal
use it will wear.
If catcher
needs
replac-
ing, replace
only with approved
replace-
ment catcher
shown
in the Repair
Parts
section
of this manual.
Give the lawn
mower model
number
when ordering.
ENGINE
LU BRICATION
Use only high quality
detergent
oil rated
with API service
classification
SG-SL.
Select the oil's SAE viscosity
grade
according
to your expected
operating
temperature.
SAEVISCOSITYGRADES
F
-20
0
30
32
40
60
80
100
C
-30
-2;
-1;
;
1;
20
30
4?
TEMPERATURE
RANGE ANTICIPATED
BEFORE
NEXT OIL CHANGE
Crankshaft
NOTE:
Although
multi-viscosity
oils
(5W30,
10W30
etc.) improve
starting
in
cold weather,
these
multi-viscosity
oils will
result in increased
oil consumption
when
used above 32°F.
Check your engine
oil
level more frequently
to avoid possible
engine
damage
from running
low on oil.
Check
the crankcase
oil level before
starting
the engine
and after each five (5)
hours of continuous
use. Tighten
oil plug
securely
each time you check
the oil level.
Crankshaft
12

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