Toro Reelmaster 3100-D Series Operator's Manual page 7

Figure 9
1. Nuts
3. Loosen the locknuts securing the height-of-cut brackets
to the cutting-unit side plates
Figure 10
1. Height-of-cut bracket
2. Locknut
4. Remove the height-of-cut brackets and the roller from
the cutting unit.
5. Repeat the procedure on the remaining cutting units.
2. Fixed plate
(Figure 10).
3. Adjusting screw
7