When the LOWER function begins, the oil from the main cylinders returns to the hydraulic tank. The main cylin- ders lower first since they have a greater load. When the main cylinder rods have fully retracted, the free-lift rod retracts. All the oil from the cylinders returns to the hydraulic tank through the flow control valves, lo- cated in the manifold attached to the bottom of the outer mast weldment. Each cylinder has a lowering control valve installed in its base. These lowering control valves control the lowering speed of a load if a hydraulic line breaks.