... swing precedence, confluence in boom valve, confluence in arm valve, rectilinear moving, arm lock, back oil regeneration and own crushing hammer ... pedalKAWASAKIHydraulic oil cylinder: KAYABA, inner hydraulic cushion.Swing support full sealed, avoiding water, ash and pollution.High/ ... low center of gravity and reasonable force; nine support wheels bring high stability.Standard track boards: width 600mm ...