Inspecting And Sharpening A Blade; Correcting A Cutting-Unit Mismatch - Toro Groundsmaster 5900 Operator's Manual

Inspecting and Sharpening
a Blade
Service Interval: After the first 10 hours
Every 50 hours
Before each use or daily
Both cutting edges and the sail, which is the turned-up
portion opposite of the cutting edge, contribute to a
good quality of cut. The sail lifts the grass up straight,
thereby producing an even cut. However, the sail
gradually wears down during operation, degrading
the quality of cut, although the cutting edges remain
sharp. The cutting edge of the blade must be sharp
so that the grass is cut, not torn. A cutting edge is
dull when the tips of the grass appear brown and
shredded. Sharpen the cutting edges to correct this
condition.
1. Position the machine on a level surface, raise
the cutting unit, engage the parking brake, put
the traction pedal in N
PTO switch is in the O
engine, and remove the key.
2. Examine the cutting ends of the blade carefully
(especially where the flat and curved parts of the
blade meet) as shown in
Note:
Since 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,
replace the blade
Figure 142
1. Cutting edge
2. Curved area
3. Examine the cutting edges of all of the blades.
4. Sharpen the cutting edges if they are dull or
nicked (Figure 143).
, ensure that the
EUTRAL
position, shut off the
FF
Figure 142.
(Figure 142).
3. Wear/slot forming
4. Crack
1. Sharpen at the original angle.
Note:
Sharpen only the top of the cutting edge
and maintain the original cutting angle to ensure
the sharpness.
Note:
The blade will remain balanced if the
same amount of metal is removed from both
cutting edges.
Note:
Remove the blades and sharpen them on a
grinder. After sharpening the cutting edges, install the
blade with the anti-scalp cup and blade bolt; refer
to Removing and Installing the Cutting-Unit Blade(s)
(page 92).
Correcting a Cutting-Unit
Mismatch
When there is mismatch between the blades on a
single cutting unit, the grass appears streaked when it
is cut. You can correct this problem by ensuring that
the blades are straight.
1. Using a 1 m (3 ft) long carpenter's level, find a
level surface on the shop floor.
2. Raise the height-of-cut to the highest position;
refer to Adjusting the Height of Cut (page
3. Lower the cutting unit onto a flat surface and
remove the covers from the top of the cutting
unit.
4. Rotate the blades until the ends face forward
and backward.
g006530
5. Measure from the floor to the front tip of the
cutting edge. Record this condition.
6. Rotate the same blade so that the opposite end
is forward and measure it again.
Note:
The difference between the dimensions
must not exceed 3 mm (1/8 inch). If the
dimension exceeds 3 mm (1/8 inch), replace the
blade, as it is bent. Measure all the blades.
7. Ensure that the deck is level from side to side
and adjust as required.
8. Install the belt covers.
93
Figure 143
g000276
30).