Floor treatment machine

A floor cleaning or polishing machine comprising one or more generally disc-shaped, floor-facing work heads for treating the floor surface, one or more motors for driving the one or more work heads via a transmission unit for each work head, wherein each transmission unit provides a generally vertical drive shaft which is provided at a lower end region thereof with a co-axial chuck for releasably engaging with the associated work head so as to rotate the work head in use, wherein the machine is provided with a treatment liquid reservoir, and at least one liquid conduit extending from the reservoir towards a transmission unit of one of the work heads, and wherein the drive shaft is provided with a co-axially extending through-bore in which is received a generally vertically oriented liquid feed tube, the feed tube providing a liquid path for treatment liquid through the transmission unit and through the associated work head, the feed tube having an upper region for receiving treatment liquid from the liquid conduit and a lower region which feeds through the work head so as to serve as a treatment liquid outlet for delivering treatment liquid to the underside of the work head.