With the ES Series, strength is apparent on the inside and out. Its components and structures are engineered for maximum power and endurance. The drive unit features a Crown-built AC traction motor and heavy-duty cast iron gearbox to handle the heaviest loads. A formed steel tiller arm with die-cast aluminum control handle ensures long life in the toughest environments. The rugged power unit features a thick steel skirt and removable steel covers. The mast features nested I-beam construction and thick steel cross bars.