Originally released in 2008, the Model 40/36 biomass Originally released in 2008, the Model 40/36 biomass chipper is now available in a track configuration to allow for greater mobility in the field and forest. The chipper can fill a chip truck to the legal load limit in just 15-20 minutes while maintaining high fuel efficiency, according to Morbark. And because the internal drive feed system has few moving parts, the chipper requires less maintenance.