Dock levellers are among the hardest-working components in any warehouse or distribution centre. They bridge the gap between the loading dock and the vehicle trailer, enabling the smooth transfer of goods between the building and the transport fleet. Selecting the right dock leveller — and maintaining it properly — is essential for operational efficiency and safety.
Types of Dock Leveller
There are three main types of dock leveller in common use. Mechanical (spring-assisted) dock levellers use a counterbalance spring mechanism and are operated manually by walking the lip plate into position. They are the most economical option and suitable for facilities with low to moderate traffic volumes. Hydraulic dock levellers use a hydraulic pump and cylinder system for push-button operation, providing smooth, consistent positioning with minimal operator effort. They are the preferred choice for busy distribution centres where frequent use demands reliability and ease of operation. Air-powered (airbag) dock levellers use inflatable bags to raise the platform, offering a good balance between the simplicity of mechanical units and the performance of hydraulic systems.
Selection Criteria
Choosing the right dock leveller depends on several factors: the frequency of use (how many vehicle movements per day), the types of vehicles served (rigid trucks, articulated trailers, or vans), the range of vehicle bed heights that must be accommodated, the maximum load to be transferred across the leveller (including the weight of the forklift or PPT), the required leveller width and length, and the environmental conditions (external dock levellers must withstand weather exposure). Getting the specification wrong can result in premature wear, safety hazards, and operational bottlenecks.
Maintenance: Protecting Your Investment
Dock levellers operate in harsh conditions — exposed to weather, subjected to heavy impacts from vehicle reversing, and cycled thousands of times per year. Without regular maintenance, they deteriorate rapidly. A properly maintained dock leveller will operate reliably for 15-20 years; a neglected one may fail within 5. Key maintenance tasks include regular inspection of hydraulic systems for leaks and performance degradation, lubrication of hinges, pins, and moving parts, inspection and adjustment of lip plate alignment, checking of safety features including vehicle restraints and traffic lights, cleaning of pit areas to prevent debris accumulation, and seasonal checks of seals and weatherproofing. At FcMig, dock leveller maintenance is a standard component of our facility maintenance programmes.
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