Featuring an independent material-feed system with four sonic sensors, the new Volvo PF-6000 Series asphalt pavers (models PF-6110, PF-6160 and PF-6170) have a self-priming function to fill the auger-tunnel area in front of the screed, plus an automatic conveyor-chain tensioning system. The PF-6160 and PF-6170 use a level-ride undercarriage system that employs a hydraulic bogie system allowing independent action at each of the front bogies.