Correcting Cutting Unit Mismatch - Toro Groundsmaster 120 Operator's Manual

2
1
Figure 15
1. Sail Area of Blade
2. Blade
3. Anti–scalp Cup
Sharpening the Blades
1. Use a file to sharpen the cutting edge at both ends of
the blade (Fig. 16). Maintain the original angle. The
blade retains its balance if the same amount of
material is removed from both cutting edges.
1
Figure 16
1. Sharpen at original angle
2. Check the balance of the blade by putting it on a blade
balancer (Fig. 17). If the blade stays in a horizontal
position, the blade is balanced and can be used. If the
blade is not balanced, file some metal off the end of
the sail area only (Fig. 15). Repeat this procedure until
the blade is balanced.
1
Figure 17
1. Blade
3
4
5
1082
4. Lock Washer
5. Blade Bolt
m–1854
2
m–1855
2. Balancer
14
Installing the Blades
1. Install the blade and anti–scalp cup onto the spindle
shaft (Fig. 15).
Important The curved part of the blade must be
pointing upward toward the inside of the mower to ensure
proper cutting.
2. Install the lock washer and blade bolt (Fig. 15). Torque
the blade bolt to 85–110 ft.-lb (115–149 N m).
Correcting Cutting Unit
Mismatch
If one cutter blade cuts lower than the other, correct as
follows:
1. Stop the engine, remove the key and disconnect the
spark plug wire(s) from the spark plug(s).
2. Adjust the tire pressure in all tires to specifications and
check that the blades are not bent. Refer to Checking
for Bent Blades on page 13.
3. Set the height-of-cut to the 3-1/2 in. (89 mm) or 4 in.
(102 mm) position. Refer to Adjusting the
Height-Of-Cut in the Operation section. Make sure the
clevis pins are resting on the frame cushions.
4. Rotate the blades so the tips line up with one another.
The blade tips must be within 1/8 in. (3 mm) of each
other. If the blade tips are not within 1/8 in. (3 mm) of
each other, add shim washers (Part No. 3256-24)
between the appropriate spindle housing and the
bottom of the cutting unit to align the blades.
Setting the Front-to-Rear Pitch
1. Check the tire pressure.
2. Position the blades front-to-rear (Fig. 18). Measure at
C and D locations (Fig. 18) from a level surface to the
cutting edge of the blades (Fig. 19).
3. The mower should be 1/8–5/8 in. (3–16 mm) lower in
front C than in the rear D.