Abstract: A trommel assembly includes a trommel frame, a plurality of screen panels mounted to the trommel frame to define a material processing channel configured for receipt of screening material, and a gate assembly mounted to the plurality of screen panels. The gate assembly extends into the material processing channel along a radial direction and includes a plurality of circumferential dams that extend substantially along a circumferential direction and are spaced apart along an axial direction to define a plurality of screening stages. The gate assembly further includes a plurality of transfer gates extending at a transfer angle relative to the circumferential direction between adjacent dams of the plurality of circumferential dams, wherein the plurality of transfer gates connect the plurality of screening stages such that rotating the trommel assembly advances the screening material through the material processing channel.

Abstract: A system for leveling a personnel carrying platform mounted on the end of an elongated vehicle mounted boom. A pendulum controlled hydraulic valve controls the application of fluid pressure to a pair of cylinders equipped on their ends with a series of links extending along a drum connected to the platform mounting pin. When the platform deviates from a level position, one of the cylinders is retracted to turn the platform mounting pin in a direction to correct the deviation. An interlock valve disables the platform leveling system unless the boom is being moved. A manual override valve allows the platform to be tilted for storage or other reasons.