Craftsman 917.28708 Operator's Manual page 20

20.0 hp, 42" mower electric start automatic transmission lawn tractor
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TO SHARPEN
BLADE
NOTE:
We do not recommend
sharp-
ening
blade
- but if you do, be sure the
blade is balanced.
Care
should
be taken
to keep the blade
balanced.
An unbalanced
blade will cause
excessive
vibration
and eventual
damage
to mower
and 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,
you will need a
5/8" diameter
steel bolt, pin, or a cone
balancer.
(When
using
a cone balancer,
follow
the instructions
supplied
with
balancer.)
NOTE:
Do not use a nail for balancing
blade.
The lobes
of the center
hole may
appear
to be centered,
but are not.
Slide blade
on to an unthreaded
portion
of the steel bolt or pin and hold the
bolt or pin parallel
with the ground.
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.
5/8" Bolt or Pin
Blade
Center Hole
BATTERY
Your tractor
has a battery
charging
system
which
is sufficient
for normal
use.
How-
ever, periodic
charging
of the battery
with
an automotive
charger
will extend
its life.
*
Keep battery
and terminals
clean.
Keep battery
bolts tight.
Keep small vent holes
open.
Recharge
at 6-10 amperes
for 1 hour.
NOTE:
The original
equipment
battery
on
your tractor
is maintenance
free. Do not
attempt
to open
or remove
caps or covers.
Adding
or checking
level of electrolyte
is
not necessary.
TO CLEAN
BATTERY
AND TERMINALS
Corrosion
and dirt on the battery
and
terminals
can cause
the battery
to "leak"
power.
1.
Disconnect
BLACK
battery
cable
first
then
RED
battery
cable
and remove
battery
from tractor.
2.
Rinse
the battery
with plain water
and
dry.
3.
Clean
terminals
and battery
cable
ends
with wire
brush
until bright.
4.
Coat terminals
with grease
or petro-
leum jelly.
5.
Reinstall
battery
(See "REPLACING
BATTERY"
in the Service
and Adjust-
ments
section
of this manual).
TRANSAXLE
COOLING
The transmission
fan and cooling
fins
should
be kept clean
to assure
proper
cooling.
Do not attempt
to clean fan or transmis-
sion while
engine
is running
or while the
transmission
is hot. To prevent
possible
damage
to seals,
do not use high pressure
water
or steam
to clean
transaxle.
Inspect
cooling
fan to be sure fan blades
are intact
and clean.
Inspect
cooling
fins for dirt, grass
clip-
pings
and other materials.
To prevent
damage
to seals,
do not use com-
pressed
air or high pressure
sprayer
to
clean
cooling
fins.
TRANSAXLE
PUMP
FLUID
The transaxle
was sealed
at the factory
and fluid
maintenance
is not required
for
the life of the transaxle.
Should
the trans-
axle ever leak or require
servicing,
contact
a Sears
or other
qualified
service
center.
V-BELTS
Check
V-belts
for deterioration
and wear
after 100 hours
of operation
and replace
if necessary.
The belts are not adjustable.
Replace
belts if they begin
to slip from
wear.
ENGINE
LUBRICATION
Only use high quality
detergent
oil rated
with API service
classification
SG-SL.
Se-
lect the oil's SAE viscosity
grade
according
to your expected
operating
temperature.
SAE VISCOSITY
GRADES
F
-20
0
30
32
40
60
80
100
c -io
-_;
-1;
;
1'o
_o
io
4;
TEMPERATURE
RANGE ANTICIPATED
BEFORE
NEXT OIL CHANGE
oilviscchar
tl e
NOTE:
Although
multi-viscosity
oils
(5W30,
10W30
etc.) improve
starting
in
cold weather,
they will result
in increased
oil consumption
when
used above
32°R
Check
your engine
oil level more frequent-
ly to avoid
possible
engine
damage
from
running
low on oil.
Change
the oil after every
50 hours
of op-
eration
or at least once
a year
if the tractor
is not used for 50 hours
in one year.
20

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