A hydraulically actuated diverter for selectively controlling a flow of wash fluid in a dishwashing appliance is provided. The hydraulically actuated diverter includes a top portion and a bottom portion that are coupled together to form a diverter chamber. A shaft of a diverter valve is slidably received within a channel defined by the bottom portion of the diverter. The shaft and the channel define an annular gap that allows the shaft to slide and rotate within the diverter chamber. The shaft defines an alignment member positioned within the annular gap to prevent the shaft from moving out of alignment with the channel, reducing the likelihood of excessive friction and binding of the diverter valve.