909 DYM-1773, Instruction Manual, Page: 12 / 16

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9.2 Cutting blade
CAUTION: Be sure to disconnect and ground the spark
plug wire before working on the cutting blade to prevent
accidental engine starting. Protect hands by using heavy
gloves or a rag to grasp the cutting blades .lip mower as
specified in separate engine manual. Remove the hex bolt
and washer which hold the blade and blade adapter to the
engine crankshaft. Remove the blade and adapter from the
crankshaft.
WARNING:
Periodically inspect the blade adapter for
cracks, especially if you strike a foreign object. Replace
when necessary. For best results your blade should be
sharp. The blade may be resharpened by removing it and
either grinding or filing the cutting edge keeping as close to
the original bevel as possible. It is extremely important that
each cutting edge receives an equal amount of grinding to
prevent an unbalanced blade. Improper blade balance will
result in excessive vibration causing eventual damage to
the engine and mower. Be sure to carefully balance blade
after sharpening. The blade can be tested for balance by
balancing it on a round shaft. saewdriver. Remove metal
from the heavy side until it balances evenly.
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. Install the blade adapter on
the crankshaft. Refer to figure 13. Place the blade with the
part number facing away from the adapter.
Align the washer over the blade and insert the hex bolt.
lighten the hex bolt to the torque listed below:
9.3 Blade mounting torque
Center Bolt 40Nm-50Nm. to insure safe operation of your
unit. ALL nuts and bolts must be checked periodically for
correct tightness.
After prolonged use, especially in sandy soil conditions,
the blade will become worn and lose some of the original
shape. Cutting efficiently will be reduced and the blade
should be replaced. Replaca with an approved factory
replacement blade only. Possible damage resuffing from
blade unbalance condition is not the responsibility of the
manufacturer.
When you change the blade, Must use the original type
marked on the blade (26300100401 for DYM1773); (for
order the blade, pis. contact your local dealer or call our
company)
9.4 Engine
Refer to the separate engine manual for engine
maintenance instructions. Maintain engine oil as instructed
in the separate engine manual packed with your unit. Read
and follow instructions carefully.
Service air cleaner as per separate engine manual under
normal conditions.
Clean every few hours under extremely dusty conditions.
Poor engine performance and flooding usually indicates that
the air cleaner should be serviced.
To service the air cleaner, refer to the separate engine
manual packed with your unit.
The spark. plug should be cleaned and the gap reset once
a season. Spark plug replacement is recommended at the
start of each mowing season; check engine manual for
correct plug type and gap specifications.
Clean the engine regularly with a cloth or brush. Keep the
cooling system (blower housing area) clean to permit proper
air circulation which is essential to engine performance and
life. Be certain to remove all grass, dirt and combustible
debris from muffler area.
Flat Key
Blade Adapter
Blade
Washer
Hex Bolt