The Dock Leveler is designed to accommodate a maximum of five inches above and below the dock, providing 18.5% grade down and 20% grade up. This is acceptable for most gas or propane forklifts but is not suitable for most pallet trucks or many electric forklifts.
Freight trailers range in height from 46 to 56 inches; for optimum performance the Dock Leveler should be mounted at 51" above the driveway.
Refrigerated trailers range in height from 50 to 60 inches; for optimum performance the Dock Leveler should be mounted at 55 inches above the driveway. In addition this application requires a 17" reefer lip to accommodate the offset floor of the trailer.
Flat bed trailers have a wide range of trailer heights. Dock boards or other equipment may be needed for extreme height variations.
Containers have variations in both floor heights and door configurations.
Captive fleets require mounting midway between lowest and highest trailer, provided ±5" range is maintained.
Pallet trucks and electric forklifts can be used with trailers 3 inches above and three inches below dock level. Dock boards or other equipment may be needed to accommodate a greater service range for pallet jacks and electric forklifts (This is due to limited clearance and grade this type of equipment operates at).
NOTE: Dock Levelers WILL NOT accommodate refrigerated and freight trailers at a single dock location due to above specified conditions.