The SK597-AT4 is the fourth generation of the Spierings hydraulic mobile tower crane with four axles. The four-part jib of the SK597-AT4 provides a 48-metre working radius with a compact vehicle length. The maximum lifting height is 27.8 metres with the jib in the horizontal position, and no less than 58.1 metres with the jib at a 45-degree upward angle.
The SK597-AT4 has the very latest technology when it comes to cranes. The crane can lift its maximum load of 7000 kg without using additional ballast blocks.
Extendible jib technology
In mobile tower cranes, the radius of the crane is often one of the essential factors. Spierings developed the extendible jib technology to increase the radius even further. This new development was first used on the SK1265-AT6 crane, achieving a radius of 60 metres with a 1.7-ton maximum tip load. The extendible jib delivers an extra eight metres of jib length. The jib itself becomes wider after it is extended, making the width of the extendible jib the same as that of the existing jib section. This technology has also been implemented on the SK2400-AT7 and SK2400-R models. A modified version of the extendible jib has also been used on the SK597-AT4 and SK487-AT3 cranes. With this type of crane, an extra jib length of four metres is obtained. Furthermore, the transition between the jibs is seamless, because two carbon sections rotate at the same time while the jib is being interlocked and adopt the same dimensions as the rest of the jib. These cranes also achieve a maximum tip load of 1.7 tons.
Steel pads with auxiliary crane
Spierings developed its steel support pads with an auxiliary crane to guarantee maximum safety and drive the “one-man” concept. The operator can position the pads quickly and simply with the aid of an auxiliary crane. Once the crane’s outriggers have been positioned and the tower has been raised, the operator can use the auxiliary crane to position the steels pads at the outrigger feet. The steel pads are carried on the truck’s rear box, so no additional transport or personnel is required. The pads are made from high-quality steel, making them very tough yet light in weight. The pads are galvanised as standard.
Hydraulic crane movements
All crane movement commands are hydraulically proportional. This makes it easy to operate the crane and delivers maximum precision and efficiency. Numerous refinements mean that the design is of an exceptionally high quality and the crane offers unrivalled control and fine-tuned accuracy, allowing precise, rapid movements. The upper engine drives three hydraulic pumps for crane operations, with no interference from any inefficient components.