Master Controller is housed in an enclosure and provided with an easily removable cover with ample area for maintenance. The cam shaft is mounted on bearing bushes on the walls of the housing.

They are made of delrin material and fixed on square spindle switch which are moved by a handle. The cams are cut according to the switching program.

Dual Master Controller with one universal handle allows a crane operator to control both bridge and trolley motions with one handle. Simultaneous operations of bridge and trolley motions are provided for greater sporting accuracy and faster movement of loads.