Benford Dumper Wiring Diagram. Mecalac dumper & roller spares. ===== terex benford 3000 dumper. 9" Clutch Assy for Thwaites MACH 273 245 240, Benford & Winget Dumpers from www.ebay.co.uk Posted by anonymous on aug 02, 2013. Mecalac dumper & roller spares. What age is the dumper.