Toro 31971 Operator's Manual page 20

servicing the blades. Only replace or sharpen the
blades; never straighten or weld them.
•
On multi-bladed machines, take care as rotating 1
blade can cause other blades to rotate.
Checking for a Bent Blade
After striking a foreign object, inspect the machine
for damage and make repairs before starting
and operating the equipment. Torque all of the
spindle-pulley nuts to 176 to 203 N∙m (130 to 150
ft-lb).
1. Park the machine on a level surface, raise the
cutting unit to the T
the parking brake, shut off the engine, and
remove the key.
2. Raise the cutting unit to the S
refer to your traction unit Operator's Manual.
3. Rotate the blade until the ends face forward and
backward and measure from the inside of the
cutting unit to the cutting edge at the front of the
blade (Figure 24).
Note:
Remember this dimension.
Figure 24
4. Rotate the opposite end of the blade forward
and measure between the cutting unit and
cutting edge of the blade at the same position
as in step 3.
Note:
The difference between the dimensions
obtained in steps 3
(1/8 inch). If the dimension exceeds 3 mm (1/8
inch), the blade is bent and must be replaced;
refer to Removing and Installing the Cutting-Unit
Blade(s) (page 20).
Removing and Installing the
Cutting-Unit Blade(s)
Replace the blade if it hits a solid object, is out
of balance, or is bent. Always use genuine Toro
replacement blades to ensure safety and optimum
performance.
1. Park the machine on a level surface, raise the
cutting unit to the T
the parking brake, shut off the engine, and
remove the key.
2. Raise the cutting unit to the S
refer to your traction unit Operator's Manual.
3. Grasp the end of the blade using a rag or
thickly-padded glove.
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position, engage
RANSPORT
position;
ERVICE
and 4 must not exceed 3 mm
position, engage
RANSPORT
position;
ERVICE
4. Remove the blade bolt, anti-scalp cup, and
blade from the spindle shaft
1. Blade bolt
5. Install the blade, anti-scalp cup, and blade bolt
and tighten the blade bolt to 115 to 149 N∙m (85
to 110 ft-lb).
Important:
must be pointing toward the inside of the
cutting unit to ensure proper cutting.
Note:
After striking a foreign object, torque all
spindle-pulley nuts to 115 to 149 N∙m (85 to 110
ft-lb).
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Inspecting and Sharpening the
Cutting Unit Blade(s)
Both cutting edges and the sail, which is the turned-up
portion opposite of the cutting edge, contribute to a
good quality of cut.
Maintain sharp blades throughout the cutting season.
Sharp blades create a clean cut without tearing or
shredding the grass blades.
Check the blades for any wear or damage. The sail
lifts the grass up straight, thereby producing an even
cut and gradually wears down during operation.
1. Park the machine on a level surface, raise the
cutting unit to the T
the parking brake, shut off the engine, and
remove the key.
2. Raise the cutting unit to the S
refer to your traction unit Operator's Manual.
3. Examine the cutting ends of the blade carefully,
especially where the flat and curved parts of the
blade meet
Note:
Because sand and abrasive material
can wear away the metal that connects the flat
and curved parts of the blade, check the blade
before using the mower. If you notice wear
(Figure 26), replace the blade.
20
(Figure
Figure 25
2. Anti-scalp cup
The curved part of the blade
position, engage
RANSPORT
ERVICE
(Figure 26).
25).
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position;