. Operate radius small, can work in small area, suitable for groove backfill. 2). Use famous diesel engine honda gasoline engine or changfa diesel engine , water-cooled diesel, high nd quality assurance, superior performance, easy to start. 3). Adopt international famous brand SAUER hydraulic drive unit, and infinitely variable speed, walk forward and backward, reversing convenient. 4). Use electrical startup, machine vibration control use electromagnetic clutch, easier operation. 5). Adopt international NSK bearing, MITSUBOSHI triangle belt, ensure the machine's work performance. 6). Surface spray, beautiful appearance, rust resistant.