Hydraulic system for a refuse truck

摘要

An apparatus for compacting refuse as in the body of a rear loader refuse truck having a movable panel which extends across the body as a barrier against which the refuse is compacted by a packer blade. The packer blade is movable through a loading hopper to move the refuse into the rear of the body and to compact it against the panel. The apparatus has an hydraulic system including a pump for supplying fluid at a controlled maximum system pressure, an hydraulic cylinder mechanism for powering the packer blade and a valve which is biased toward neutral and which is manually movable to a power position for supplying fluid to the hydraulic cylinder. The valve has pressure responsive means which hold it in power position and which are deactivated when the pressure in the hydraulic cylinder reaches a level below maximum system pressure. The apparatus comprises a manually activated, position sensing device, for example an engageable cam, which can be set to overcome the pressure responsive means and to hold the valve in power position. An element of the packer blade structure deactivates the position sensing cam when the packer blade reaches a position close to but short of its normal final rest position which allows the bias on the valve to return it to neutral and to stop the movement of the packer blade.