Units
DPA Cutting
Rev. FReelmaster 6500--D/6700--D
DPA Cutting Units
Page 7.2 -- 21
Bedknife Replacement and Grinding
Bedknife Removal
1. Remove bedbar from cutting unit (see Bedbar Re-
moval in this section).
2. Remove screws from bedbar using a socket wrench
and bedknife screw tool (see Special Tools). Discard
screws. Remove bedknife from the bedbar (Fig. 22).
Bedknife Installation
1. Use scraper to remove all rust, scale and corrosion
from bedbar surface and lightly oil surfacebefore instal-
ling bedknife.
2. Make sure that screw threads in bedbar
(5/16--18UNC--2A) are clean. Apply antiseize lubricant
to the threads of new screws. Take care to keep anti-
seize lubricant from taper on screw heads.
IMPORTANT: Do not use an impact wrench to tight-
en screws into the bedbar.
3. Usenew screws to secure bedknife to bedbar.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 (23 to 28 N--m). Use a torquing pattern
workingfrom thecenter toward each endof the bedknife
(Fig. 23).
4. After installing bedknife to bedbar, grind bedknife.
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 to the bedbar. Because of this, it is neces-
sary to grind a new bedknife after installing it to the bed-
bar. Follow the existing angle that was ground into the
bedknife and grind only enough to make sure the top
surface of the bedknife is true (Fig. 24).
Note: When grinding the bedknife, be careful to not
overheat the bedknife.Remove small amounts ofmate-
rialwitheach passofthegrinder.Also,clean anddress
grinding stone often during the grinding process.
1. Use Toro Service Training Book, Sharpening
Reel and Rotary Mowers (part no. 80300SL) and
grinder manufacturer’s instructions for bedknife grind-
ing information.
Bedknife Grinding Specifications (see Fig. 24)
Bedknife Relief Angle 3
o
to 7
o
Bedknife Front Angle 3
o
to 7
o
Minimum Bedknife Lip Height 0.190” (4.8 mm)
2. After grinding bedknife, check lead--in chamfer on
bedknife (see Cutting Unit Operator’s Manual).
3. After bedknife grinding is complete, install bedbar to
cutting unit (see Bedbar Installation in this section).
1. Screw (8 used)
2. Bedbar
3. Bedknife
Figure 22
1
2
3
Antiseize
Lubricant
200 to 250 in--lb
(23to28N--m)
Lightly Oil
Bedbar Surface
Figure 23
12468357
Figure 24
Relief Angle
Front Angle
Top Face
Front
Face
Remove
Burr
Bedknife
Lip
Height
