A trigger control apparatus (38) is provided for operating a transmission (44) of a self-propelled mowing machine (20) via a cable (42) between a halt condition and an advancement condition. The trigger control apparatus includes a housing (100), and a plurality of independently operable triggers (52) rotatably coupled to the housing for movement between an engaged and a disengaged position. Each trigger includes an operation member (108). A cam (114) is rotatably coupled to the housing about a cam rotation axis (116) and operatively coupled to the cable (42), wherein rotation of the cam (114) in a first direction relatively increases tension in the cable (42). An actuation member (138) is coupled to the cam a distance from the cam rotation axis (116). Movement of at least one of the plurality of triggers (52) towards the engaged position causes a respective operation (108) member to engage the actuation member (138) to rotate the cam (114) in the first direction, whereby the transmission (44) is operated in the advancement condition.
