Toro Greensmaster Flex 1820 - Page 133

Greensmaster Flex 1800/1820/2100/2120 Page 7 − 15 Cutting Unit
Bedknife Grinding
Since there can be variations in the mounting surface of
the bedbar, it is necessary to grind the bedknife after in-
stalling it to the bedbar. Follow the bedknife grinding
specifications provided (Fig. 22). Grind only enough so
the top surface of the bedknife is true (Fig. 23).
IMPORTANT: Do Not grind the bedknife below it’s
service limit (Fig 24). Operating the cutting unit with
the bedknife below the service limit may result in
poor after−cut appearance and reduce the struc-
tural integrity of the bedknife.
The bedknife service limit occurs when the reel contacts
the back of the bedknife scallop during operation. Check
for reel contact marks at the back of the bedknife scallop
prior to grinding. The bedknife service limit may also oc-
cur when the bottom of the bedknife scallop is reached
when grinding the bedknife.
When grinding the bedknife, be careful to not overheat
the bedknife. Remove small amounts of material with
each pass of the grinder. Also, clean and dress grind-
ing stone often during the grinding process.
NOTE: EdgeMax

bedknives are extremely hard. Us-
ing a diamond grinding wheel is recommended to pre-
vent overheating or damaging the bedknife edge while
grinding.
Because the top grind angle on bedknives is critical for
edge retention, and therefore after−cut appearance,
Toro has develop special service tools for accurately
measuring the top grind angle on all bedknives; refer to
the Angle Indicator and Magnetic Mount in the Special
Tools section of this Chapter.
1. Use Toro General Service Training Book, Reel Mow-
er Basics (part no. 09168SL) and grinder manufactur-
er’s instructions for bedknife grinding information.
2. After bedknife grinding is complete, install bedbar to
cutting unit (see Bedbar Installation in this section).
NOTE: Always adjust the cutting unit after grinding the
reel and/or bedknife; refer to the Cutting Unit Operator’s
Manual. If a properly adjusted cutting unit does not cut
paper cleanly after grinding, the grind angle may be in-
correct. To extend the cutting unit performance by allow-
ing the reel and the bedknife to hold their edge longer,
an additional adjustment may be required after the first
few minutes of operation as the reel and bedknife con-
form to each other.
Bedknife Grinding Specifications (see Fig. 23)
Standard bedknife relief angle 3
o
minimum
Extended bedknife relief angle 7
o
minimum
Front Angle Range 13
o
to 17
o
Figure 22
1. Top angle
2. Top surface
3. Remove burr
(without dulling sharp
corner)
4. Front surface
5. Front angle
Figure 23
1
5
2
4
3
1. Service limit
(reel contacts back of
bedknife scallop during
operation)
2. Service limit
(bottom of bedknife
scallop reached when
grinding)
Figure 24
2
1
Cutting Unit