The invention relates to a device for metering a granular or grainy material in a distributor machine, comprising a housing (1); an inlet opening (2) which is formed on the housing (1) and through which a granular or grainy material can be introduced in the housing (1) for metering; an outlet opening (3) which is formed on the housing (1) and through which the granular or grainy material can be discharged out of the housing (1) after metering; a metering space (4) which is formed in the housing (1) in such a way that granular or grainy material in the housing (1) can be moved from the inlet opening (2) via the metering space (4) to the outlet opening (3); a metering wheel (5) which is arranged in the metering space (4) on a drive shaft (6), and which is configured to meter the granular or grainy material supplied via the inlet opening (2); a mounting opening (12) which is formed on the housing (1) and via which the metering wheel (5) can be exchangeably mounted in the metering space (4); and a mounting compon
