The hydraulic operating pressure of all hooklift hoists are preset at the factory to achieve the intended lifting capacity for the design application.
There are two common types of jib system, each controlled by a single hydraulic cylinder. Both systems can be used with either asingle or dual rear pivot section.
* The articulating jib, also referred to as a tilting jib, is a simple a-frame. When extending the cylinder, the container/body is pushed up and back, exiting the rear locks. When retracting the cylinder, the container/body is pulled forward and down, engaging the rear locks.
* The sliding jib consists of a single arm, composed of a tube inside a tube. When extending the cylinder, this design pulls the container/body forward, engaging the rear locks. When retracting the cylinder, this design pushes the container/body rearward, exiting the rear locks.
Rear lock system
The slide through style rear lock offers a container/body engagement of up to 50 in (1,270 mm). This style typically allows more extensive weight transfer while the container/body remains inside the rear locks.
The dual lift/dump cylinder design, whilst increasing unit cost, improves load handling stability when dumping on uneven ground.