mounted to the base plate 52 with bolts 68 and 70 at one end and welded at the other end the two switches mounted on the center plate 54 are positioned as needed before being fixed such as with screws to the center plate 54 the six mounted switches 34 describe a semicircle addressed by the cam 32 as it reciprocates as shown in fig2 the switches 34 are mounted on a raised portion 72 of the side plates 56 and 58 the cam 32 is rotatably mounted to the base plate 52 about its central axis 50 with a spacer 74 therebetween this raises the cam 32 above the lower stepped portions 76 of the side plates 56 and 58 and up to the level of the cam operated switches 34 movement of the cam 32 triggers the switches 34 indicating the position of the arm 44 in the refuse truck example a bell crank 80 is attached to shaft 46 and mechanically linked to cylinders 28 and 30 the cylinders 28 and 30 are attached to opposite sides of the truck box in the plane of the bell crank 80 as shown in fig1 and 4 10 first and second cylinder rods 82 and 84 extend from cylinders 28 and 30 to the bell crank 80 and are rotatably connected at 86 and 88 respectively first and second cylinder rods 82 and 84 extend and retract from their respective cylinders to rotate the bell crank 80 which turns the shaft 46 and arm 44 fig4 10.