New Holland CX720 Operator's Manual page 289

Drum and concave type of use
When harvesting cereals, it is advisable to use a
standard or universal drum and a cereals concave.
When harvesting maize, a standard or universal
drum and a maize concave should be installed.
When harvesting rice, a universal drum with peg tooth
bars and a rice concave should be installed.
If needed, the concave and / or universal drum can be
converted for harvesting other crops (e.g. when
switching from cereals to maize).
Replacement of the drum concave
To remove the drum concave, proceed as follows:
1. Park the combine on a level surface and check if
the cleaning shoe is level (if self levelling cleaning
shoe).
2. Close the concave completely with the drum con-
cave clearance rocker switch in the cab.
3. Detach the straw elevator. Refer to "Straw
elevator - Removal and Installation" of this
Section.
4. Open the stone trap and the pivot plate.
5. Remove grain pan access covers 1 left and right.
6. In case a small grain concave is installed, close
the de-awning plates by using the special tool
located at the left-hand side of the straw elevator.
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