Slave valve with integral synchro-saver logic

摘要

A pneumatic control system for a range type compound transmission is provided including a first actuator valve (102) that selectively connects a first range cylinder chamber (114) to a pneumatic source when a high range shift is requested by the vehicle operator, and a second valve (150) that selectively connects a second range cylinder chamber (116) to a pneumatic source when the main transmission is in gear, but exhausts the second chamber when the main transmission section is in neutral.