Toro Greensmaster Flex 21, Service Manual

Page: 100 / 150

Greensmaster Flex 21 Page 7 – 16 Cutting Unit (Rev. C)
Bedknife Service
Bedknife Removal
1. Remove bedbar from frame (see Bedbar Removal in
this section).
2. Remove screws that fasten bedknife to bedbar using
a socket wrench and bedknife screw tool. Discard
screws. Remove bedknife from the bedbar (Fig. 24).
3. Use a scraper to remove all rust, scale and corrosion
from bedbar surface before installing new bedknife.
Bedknife Installation
1. Make sure bedbar threads are clean. If necessary,
use 5/16 – 18UNC 2A tap to chase threads.
2. Use new screws to secure bedknife to bedbar. Apply
anti–seize lubricant to the screws before installing.
IMPORTANT: Do not use an impact wrench to tight-
en screws into the bedbar.
3. Using a torque wrench and bedknife screw tool,
tighten screws to a torque of 200 to 250 in–lb (230 to 288
kg–cm). Use a torquing pattern working from the center
toward each end of the bedknife (Fig. 25).
4. Grind bedknife after installation onto bedbar.
Bedknife Grinding
Since there can be variations in the mounting surface of
the bedbar, a new bedknife will not be perfectly flat after
it is installed. Because of this, it is necessary to backlap
or grind a new bedknife after installing it to the bedbar.
Follow the existing angle that was ground into the bed-
knife and grind only enough to make sure the top surface
is true (Fig. 26). Bedbar needs to be removed from mow-
er for proper bedknife grinding.
NOTE: When grinding, be careful to not overheat the
bedknife. Remove small amounts of material with each
pass of the grinder.
1. For bedknife grinding information, refer to TORO
Sharpening Reel and Rotary Mowers Manual, Form No.
80-300 PT.
Bedknife Grinding Specifications
Standard bedknife relief angle
3 (see Fig. 27)
Extended bedknife relief angle 7 (see Fig. 27)
Front Angle 13
o
Front Angle Range 13
o
to 17
o
2. After bedknife grinding is complete, reinstall bedbar
to the mower (see Bedbar Installation in this section).
1. Screw
2. Bedbar
3. Bedknife
Figure 24
3
2
1
1 2 4 6 8 3 5 7 9 10 12 11 13
Figure 25
# TOR510880
Relief Angle
Front Angle
Top Face
Front
Face
Figure 26
Remove
Burr
Figure 27
Standard Bedknife
Extended Bedknife
1.69” (42.9 mm)
1.88” (47.8 mm)