Greensmaster Flex 18/21
Page 7 – 12
Cutting Unit
Bedknife Service
Bedknife Removal
1. Remove bedbar from cutting unit frame (see Bedbar
Removal in this section).
2. Remove screws that fasten bedknife to bedbar using
a socket wrench and bedknife screw tool (see Special
Tools). Discard screws. Remove bedknife from bedbar
(Fig. 17).
Bedknife Installation
1. Use a scraper to remove all rust, scale and corrosion
from bedbar surface before installing new bedknife.
Also, make sure bedbar threads are clean. If necessary,
use 5/16 – 18UNC 2A tap to chase threads in bedbar.
2. Use new screws to secure bedknife to bedbar. Apply
antiseize lubricant to the screws before installing. Take
care to keep antiseize lubricant from taper on screw
heads.
IMPORTANT: Do not use an impact wrench to tight-
en screws into the bedbar.
3. Install all screws but do not tighten fully. Then, using
a torque wrench and bedknife screw tool, torque screws
from 200 to 250 in–lb (22.6 to 28.2 N–m). Use a torqu-
ing pattern working from the center toward each end of
the bedknife (Fig. 18).
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. It is therefore necessary to grind a new
bedknife after installing it to the bedbar. Follow the exist-
ing bedknife angle and grind only enough to make sure
the top surface is true (Fig. 19). The bedbar needs to be
removed from mower for proper bedknife grinding.
NOTE: When grinding bedknife, be careful to not over-
heat the bedknife. Remove small amounts of material
with each pass of the grinder. Also, clean and dress
grinding stone often during the grinding process.
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
o
(see Fig. 20)
Extended bedknife relief angle
7
o
(see Fig. 20)
Front Angle
13
o
Front Angle Range
13
o
to 17
o
2. After bedknife grinding is complete, install bedbar to
the mower (see Bedbar Installation in this section).
1. Screw
2. Bedknife
3. Bedbar
Figure 17
3
1
2
Antiseize
Lubricant
200 to 250 in–lb
(22.6 to 28.2 N–m)
1
2
4
6
8
3
5
7
9
10
11
Figure 18
# TOR510880
Relief Angle
Front Angle
Top Face
Front
Face
Figure 19
Remove
Burr
Figure 20
1.69” (42.9 mm)
1.88” (47.8 mm)
Standard Bedknife
Extended Bedknife
Summary of Contents for 04022 Greensmaster Flex 21
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