The new Z-cranes are available in the 12-, 14- and 17-tonne-metre classes.
The design of the new cranes sets out to increase speed and usability. To achieve this, Kesla has, for example, chosen to use an electric valve with a higher throughput volume than that previously used. The lines to the transfer and extension cylinders have been enlarged, enabling higher crane motion speeds and improved manoeuvrability. The valve is controlled by Kesla’s electric proC control system, which is available in a variety of control options ranging from mini joysticks to a 4-lever and 2-pedal option. New valves are also available for mechanical control.
The transfer boom of the new Z-cranes is almost completely redesigned. The need for change was partly due to practical reasons, with larger lines requiring more space. The new structure includes a modified extension cylinder design, different size casings and larger pins. Despite an increase of up to 30 cm (11.8 in) in the useful outreach, the changes have been implemented with hardly any increase in weight. Kesla uses high-quality, high-strength steel as the boom material. The crane booms have received the nanoceramic Kesla proTECT surface treatment.
Kesla has always designed its cranes with ease of service in mind. This includes aspects such as the location of the pressure filters in the new cranes. Like the previous 21-series, the Kesla 22-series’ Z-cranes feature internal hoses both in the first and outer booms. The protection continues all the way to the grapple. Besides the protection, customers have also appreciated the ease of hose replacement.
The new cranes utilise separate stabiliser legs, with a particularly stable 4.5 m (14.8 ft) wide stabiliser leg option also available. This option has been well-received on the market. Most cranes above the 12-tonne-metre class are equipped with wide stabiliser legs. The stabiliser legs come with several optional cylinder stroke lengths and turning angles.
There is no need to compromise on working comfort either, as the Kesla 22Z series timber cranes can be equipped with a basic Vision Standard cabin, a well-equipped Vision cabin or a spacious Vision XL cabin. The crane can also be fitted with top seat equipment and electrical control. Due to new steps, getting to and from the operating position is easy and safe. Source