Hydraulic Pump: The heart of the HPU is the hydraulic pump, typically driven by an electric motor or engine.
This pump pressurizes hydraulic fluid, usually oil, to create the force required to lift the tailgate.
Reservoir: A reservoir stores hydraulic fluid, ensuring a constant supply to the pump. It also helps dissipate heat generated during operation.
Control Valves: Control valves regulate the flow of hydraulic fluid, enabling precise control over the tailgate's movement. These valves can be manual, electric, or electronic, allowing for various control methods.
Cylinders: Hydraulic cylinders are responsible for the actual lifting and lowering of the tailgate. They convert hydraulic pressure into mechanical force.
Filters and Coolers: HPUs are equipped with filters to remove contaminants from the hydraulic fluid, ensuring the system's longevity. Coolers help maintain the fluid's temperature within acceptable limits.
Lifting Capacity: HPUs are available in a range of lifting capacities to suit different vehicle tailgate sizes and weight requirements. Common options include 1,000 to 5,000 pounds or more.
Voltage: Electric HPUs are typically designed to work with 12V or 24V electrical systems commonly found in vehicles.
Control Options: Depending on the application, HPUs can offer manual, wired remote, wireless remote, or integrated vehicle control options.
Safety Features: These units often come with safety features like overload protection, emergency stop buttons, and anti-trap mechanisms to prevent accidents during operation.
Size and Mounting: HPUs vary in size, so they can be mounted in different locations on the vehicle, such as under the chassis, inside the tailgate, or in dedicated compartments.