Bedknife Service - Toro Greensmaster Flex 21 Service Manual

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
Extended bedknife relief angle
Front Angle
Front Angle Range
2. After bedknife grinding is complete, reinstall bedbar
to the mower (see Bedbar Installation in this section).
Cutting Unit (Rev. C)
3_ (see Fig. 27)
7_ (see Fig. 27)
o
13
o o
13 to 17
Page 7 – 16
1
3
Figure 24
1. Screw
2. Bedbar
13 11 9 7 5 3
Figure 25
Relief Angle
Front Angle
Figure 26
Standard Bedknife
Extended Bedknife
Figure 27
2
3. Bedknife
# TOR510880
1 2 4 6 8 10 12
Top Face
Remove
Burr
Front
Face
1.69" (42.9 mm)
1.88" (47.8 mm)
Greensmaster Flex 21