Cat D6D Welder Tractor S/N 2MJ01189 by cefar | Jun 11, 2013 | Welder Tractors and Tack Rigs - Rentals | 0 comments Monthly Rental Rate: $7,500 Caterpillar D6E Welder Tractor equipped with (5) Miller XMT-350 welders, Quincy 390 compressor, lead boom and outlets.