Blade Maintenance - Oregon 120V Professional Serie Manual Original De Instrucciones

Blade Maintenance

For best results, the mower blade must be
kept sharp Always replace a bent or damaged
blade
Replace blade with Oregon Part No 91-443
only
REMOVING THE BLADE
1 Remove the engine lockout key from the
rear face of the engine
2 Turn lawn mower on its right side
3 Use a wood block between blade and
mower deck to prevent blade from turning
when removing blade bolts
NOTE: Protect your hands with gloves and/
or wrap the blade with a heavy cloth
4 Remove the two outer blade bolts by turning
counter-clockwise with a 11/16" (17 mm)
wrench or socket
INSTALLING THE BLADE
1 Position the blade with the bent corner of
the blade (sail) pointing towards the deck
Install the blade bolts
IMPORTANT: Blade bolts are heat treated
If the bolts are worn or damaged use only
bolts available from Oregon
2 Use a block of wood between blade and
mower deck and tighten the blade bolts
Always use a torque wrench
The recommended tightening torque
is 30 to 35 ft lbs (40 to 45 Nm)
3 Turn lawn mower back upright onto wheels
4 Insert the engine lockout key
WARNING:
Use only a replacement
blade approved by Oregon. Using a blade
not approved by Oregon is hazardous. It
can damage your lawn mower and cause
serious personal injury.
A worn or damaged blade can break and
parts of the blade could be thrown into the
operators or bystanders area, resulting in
serious personal injury or death.
Lawn Mower Model LMA120VX-NA
Maintenance
INSPECTING THE BLADE
Carefully examine the blade for straightness,
damage and abnormal wear In some areas
abrasive sand and dust can wear away the
metal of the blade - see illustration
SHARPENING THE BLADE
File the top side of the blade (1) and maintain
the original angle of the cutting edge Maintain
the radius where the cutting edge ends Always
remove the same amount of material from
both ends of the blade This ensures that the
blade stays balanced
1
4 2
3
2
1
If sharpening is done with a grinding stone
the blade should always be balanced using a
blade balancing device A blade balance tool
is available from Oregon or most lawn and
garden dealers and hardware stores
If the blade shows wear or cracking at the
edge where the blade is bent up (3) it must
immediately be replaced
1 Cutting edge
2 Square corner
3 Erosion from sand and dirt
4 Air lift wing (sail)
4
4
3
3
1
19