Cutter Blade - Scag Power Equipment SFC-21-5CV Operator's Manual

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7.6 CUTTER BLADE

A. BLADE INSPECTION
1. Remove the spark plug wire before servicing the blade.
2. Raise the mower deck to the highest position.
WARNING
Mower blades are sharp. Always wrap blades,
wear proper hand and eye protection when
working with cutter blades.
3. Check the cutter blade for straightness. If the cutter blade
appear bent, it will need to be replaced.
4. Check the cutter blade for wear. If any part of the cutter blade is
worn to 1/2 its original thickness, replace the cutter blade.
WARNING
Do not attempt to straighten a bent blade, and
never weld a broken or cracked blade. Always
replace it with a new blade to assure safety.
5. If a blade cutting edge is dull or nicked, it should be sharpened.
Remove the blades for sharpening. See "Blade Replacement."
- NOTE -
Keep the blades sharp. Cutting with dull blades
not only yields a poor mowing job, but slows the
cutting speed of the mower and causes extra wear
on the engine and the blade drive by pulling hard.
B. BLADE SHARPENING
- NOTE -
If possible, use a file to sharpen the blade. Using
a wheel grinder may burn the blade.
- NOTE -
DO NOT sharpen the blades beyond 1/3 of the
width of the blade. See Figure 7-5.
1. Sharpen the cutting edge at the same bevel as the original. See
Figure 7-5. Sharpen only the top of the cutting edge to maintain
sharpness.
Do Not Cut In
30
Figure 7-5. Blade Sharpening
2. Check the balance of the blade. If the blade is out of balance,
vibration and premature wear can occur. The cutter blade should
be balanced to 1-1/2 oz-in. See your authorized Scag dealer for
blade balancing or special tools, if you choose to balance your
own blades.
C. BLADE REPLACEMENT
WARNING
Mowers blades are sharp. Always wrap blades,
wear proper hand and eye protection when
working with cutter blades.
1. Shut the engine off and wait for all moving parts to stop.
2. Disconnect the spark plug wire from the spark plug.
3. Raise the mower deck to the highest position.
4. Secure the cutter blade to prevent it from rotating, remove
the blade attaching bolts. Remove the cutter blade, bolts and
flatwashers from the machine See Figure 7-6.
CAUTION
Inspect the cutter blade washers for wear and/or
cupping. Replace the worn parts. Worn washers
will not allow proper tightening of the cutter blade
and can lead to cutter blade failure, personal
injury or property damage.
5. To install the new cutter blade, put the flatwashers onto the
blade bolts, and install the bolts into the holes in the cutter
blade.
30
Section 7
Angle Blade Back
X Must NOT Exceed
1/3 Blade Width
SGB033_2023