Service Procedure; Cutting Blade Service - Snapper 21351 Manual

SERVICE PROCEDURE
The mower itself requires very little service, however, it is
important that the engine be serviced at the intervals
specified in the engine manual furnished with your mower.
When performing any services on the mower, always
disconnect the spark plug wire from the spark plug to pre-
vent unintentional starting. When tipping the mower to
work on the underside, always tilt with spark plug up to
prevent flooding the engine with gasoline and oil which
would cause hard starting after servicing. NOTE: On
Tecumseh powered units, comply with the following rules
to prevent oil from entering the air cleaner and ruining the
dry element (1) DO NOT keep engine in tilted position for
more than 5 minutes. (2) DO NOT crank engine or turn
blade while tilted (3) DO NOT tilt plug up more than 90
degrees.
To retain the quality of your mower, use Genui'ne Snapper
Replacement Parts only. To obtain the correct part for your
particular mower, always specify model and serial number
as found on nameplate. Contact your local Snapper Dealer
for parts and service assistance. We recommend returning
your mower to an authorized Snapper Dealer on a yearly
basis for inspection and addition of any new devices which
might upgrade the safety of your mower. For the nearest
Snapper Dealer, check the yellow pages under the heading
LAWN MOWERS.
LUBRICATION SERVICES
ENGINE- Change oil every 25 hours as specified in engine
manual.
TRANSMISSION(Self.Propelled Models). Remove plug and
check every 25 hours of operation. If grease is not visible
on the input gear, add small amount of Snapper "00"
grease, CAUTION: Avoid over lubricating, capacity not to
exceed 2 ounces of grease. Snapper "OO" grease is
available in a convenient quart size container (Part No.
1-1050) at your Snapper dealer. Replace plug after servic-
ing transmission.
MOVING PARTS - Occasionally put a few drops of oil on
movable surfaces of components such as the height ad-
justing levers, wheel axles, shift levers, etc. Be careful not
to spill oil on surface of drive disc on self-propelled
models.
CHECK FOR
GREASE ON
INPUT GEAR
\
' Fi(3. 5- CHECKING TRANSMISSION
CUTTING BLADE SERVICE
CAUTION: Before checking or doing any work on the blade,
disconnect the spark plug wire and secure it away from the
plug to prevent unintentional starting.
CHECK at frequent intervals to make sure the blade is
securely tightened and that it is in good condition.
REPLACE blade if badly chipped, bent, out of balance or
as soon as a notch starts wearing in the tip between the
flat surface and upturned lift as depicted in View B, Figure
6. This type wear pattern occurs more rapidly under sandy
soil conditions. CAUTION: Never operate the mower with
blade worn to the extent shown in View C as the tip could
fly off causing personal injury or property damage.
SHARPEN blade when the cutting edges become dull if the
blade is in otherwise good condition. Sharpen blade on a
grinding wheel at a angle of 22 to 28 degrees. The cutting
surface should extend in.about 31/2" from the tips. Check
the blade after sharpening to determine that it is still
balanced. It will cause excessive vibration if unbalanced.
BE CAREFUL: AVOID CUTTING YOURSELF ON SHARP
BLADE! Protect your hands from cuts while handling
blade
INSTALL blade with components in sequence shown in
Figure 7. Make sure that the turned-up rims in the center of
the blade fit over the edges of the blade drive hub when in-
stalling. Do no substitute any components here. Tighten
the blade retaining capscrew 20 to 30 foot pounds torque
value.
DANGEROUS
FIG 6 - BLADE WEAR PATTERNS
1-_'_'1 _,_ -BLADE HUB
(ON E_GINE)
(_'_"_" S PEC IA L RETAINING
CAPSCREW
i
FIG 7- BLADI£ RETENTION DETAIL
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