TM 5-3895-373-201.12.6. HydraulicCylinders.Several equipmentmotions are controlled by hydraulic cylinders. Thelocation and description of these cylinders are as follows:a.Hopper Lift Cylinders. The hopper lift cylindersraise or lower the hopper wings to receive material froma material handling truck, or feed material into theconveyors. The hopper lift cylinders are located on eachside of the hopper. The cylinders are controlled fromthe operator switch panel.b.Tow Point Cylinders. The tow point cylinders areused to raise or lower the leading ends of the screed towarms to change the screed tow point. This adjustmentchanges the depth of the attack angle adjustment. Thetow point cylinders can be controlled from switches onoperator switch panel and screed control panels.Hydraulic oil to the tow point cylinder is through a manualshutoff valve and a pressure relief valve. When the towpoint cylinder is not used (disconnected) and the screedtow arm pinned, the shutoff valve should be closed toprevent movement of the tow point cylinder. The reliefvalve allows for relief of excessive pressure fromdamaging the tow point cylinder should the screed runover an obstacle causing pressure on the tow pointcylinder.c.Screed Lift Cylinders. The screed lift cylindersraise the screed to the travel position and lower thescreed for paving. The screed lift cylinders arecontrolled from the operator switch panel. When in theraised position, the screed travel lock valve must beclosed for safety. Closing the screed travel lock valvecloses the lift cylinder bleed circuits, allowing the screedto be raised, but not lowered. The screed travel lockvalve must be partially opened and screed lift switchplaced in the down, FLOAT, position to lower the screed.d.Screed Extension Cylinders. The screedextension cylinders are located inside the main screed.The extension cylinders move the extension screeds inand out. This function is used to widen or narrow thewidth of the screed contact surface. The screedextension cylinders can be controlled from the operatorswitch panel and the screed control panels.1-11
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