Demag Ac 160-5 Load Chart

[Lu Rounsaville]

TheAC 160-5 has a maximum lifting capacity of 160 metric tons (180 US tons). It has a max. boom length of 68 m (223.1 ft) and a max. system length of 94.6 m (310.4 ft). When at max. boom length it has a lifting capacity of 8.6 metric tons (9.47 US ton). Using hydropneumatic suspension with axle load compensation you can manually or automatically alternatively level.

The equipment carrier engine is a diesel Scania 405 5 with a transmission system which is a ZF TraXon. The gearbox comes standard with an integrated hydraulic retarder, 16 forward speeds, 2 reverse, and a 2-stage transfer case with a switchable longitudinal lock. This transmission gives operators the control they need in order to quickly and efficiently maneuver job sites. The AC 160-5 has a 5-axle steering system, independent rear-axle steering, and dynamic launch control, these features enable the crane to get to areas where other cranes would simply get stuck. The outriggers are hydraulic which gives the operator vertical and horizontal control.

With a total length of only 14.51 meters (47.6 ft), the most compact crane of its capacity class. In combination with its excellent maneuverability, this especially makes it the crane of choice for work at sites with tight space conditions. The IC-1 Plus control system incorporates smart technology that provides asymmetric outrigger positioning based on real-time determination of lifting capacities. This allows the crane to perform jobs usually reserved for larger machines.

The Demag AC 160-5 stands out in its category for its unmatched compactness, boasting a slender width of just 2.75 meters and an overall length of 14.51 meters. This design significantly undercuts the dimensions of its competitors, which typically exceed three meters in width. Its compact stature, combined with a sophisticated 5-axle steering system that includes independent rear axle steering and dynamic launch control, empowers the AC 160-5 to access and maneuver in tight spaces where its larger counterparts might falter.

The Demag AC160-5, a technologically advanced all-terrain crane, features a comprehensive suite of specifications designed for maximum efficiency and versatility. Equipped with a powerful Euromot 4/Tier 4F compliant Scania DC13 diesel engine, it delivers 368 kW (500 HP) at 2100 rpm, with a torque of 2373 Nm at 1300 rpm. This crane ensures operational excellence with a fuel tank capacity of 480 liters for diesel and an additional 60 liters for AdBlue.

Hydropneumatic suspension across all axles, which are hydraulically lockable, combined with a dual-circuit steering system and independent rear axle steering, enables the crane to adapt to various terrain conditions easily. The crane is fitted with 385/95 R25 (14.00R25) tires, enhancing its stability and mobility.

For operator comfort and convenience, the carrier cab is spaciously designed with a range of features including adjustable seating, powered door windows, and preparation for radio installation. The superstructure of the AC160-5 boasts a telescopic boom extending from 12.4m to 68m, with a maximum capacity of 76.6 tons, supported by a counterweight of 32.6 tons.

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Agile and Compact

The Demag AC 160-5 is the most compact crane of its class: While other machines come in at a width of three meters or more, the AC 160-5 has a narrower width of 2.75 meters and a total length of 14.51 meters, making it also shorter than its classmates. In combination with its 5-axle steering system, independent rear axle steering, and dynamic launch control, these features enable the crane to get to areas where other cranes would simply get stuck.

The Demag AC 160-5 is not just at the forefront of its class when it comes to its size, but also to its main boom length, where the crane raises the bar with a total of 68 meters. And if that is not enough, you can even extend this system length all the way to 95 meters.

Its clever axle load distribution makes the Demag AC 160-5 truly roadworthy, as it remains under an axle load limit of 12 tonnes even with a payload of up to 650 kilograms. In other words: For many jobs, it does not require additional transport vehicles, thus eliminating the costs. Moreover, the crane can be quickly set up on-site, as it already carries everything it needs to get working.

An estimated 112 million dead trees perilously populate the Sierra Nevada Mountains. The combination of unprecedented drought over the past four years coupled with significant bark beetle infestation has decimated trees throughout the mountain range in California. The severity of the problem pressed Gov. Jerry Brown of California to issue an emergency proclamation in October of 2015 for the removal of dead/dying trees in high hazard zones.

Local, state and federal agencies are in a rush to remove the trees, as the drought-stricken trees serve as kindling for the quick spread of forest fires. However, "It's slow and difficult work, as many of these trees are unsafe to climb for removal," said Ricky Mowbray, crane operation supervisor of Mowbray's Tree Service of San Bernardino, Calif. Jesse Sanchez, director of safety of Mowbray's Tree Service, added, "Dead trees create various hazards, as they are weak and have the potential to fail more easily than a live tree. The longer a dead tree stands, the more unstable it becomes."

Due to these challenges, few tree service contractors are answering the call for tree removal in high hazard zones. It's painstaking work that requires attention to detail and sometimes one or more days to safely remove a single tree.

"If conventional tactics such as tree climbing and tying off section by section cannot be used, then we move to 100-ft. spider lifts," said Mowbray. "Tree size ranges from 30 to 240 ft. tall," which poses a problem for trees too tall for the spider lifts to be safely used.

Nearly aligning with the beginning of the drought cycle in California, Mowbray's Tree Service began renting cranes for removal of dead trees. When a tree has become too hazardous to climb and/or work by conventional means, a crane is used to mitigate hazards to the climbing arborist, explained Sanchez.

The success achieved through renting cranes for dead tree removal has led Mowbray's Trees Service to the recent purchase of four Demag all terrain cranes, one acquired in December of 2016 and three more in mid-2017.

The work completed by Mowbray's Tree Service over the last 45 years has groomed this family-owned business to professionally complete such complex tree removal projects. Founded in California in 1972 by John Mowbray, Ricky Mowbray's grandfather, the company initially split private work with line vegetation management for utility companies.

Today, the company is nearly 700 employees strong, deployed mainly along the west coast with a fleet of 800 vehicles plus the four Demag cranes. Sometimes opportunities take company workers to other states.

By far the main emphasis is clearing dead and distressed trees from the Sierra Nevada Mountains. Over the last four years, Mowbray's Tree Service has perfected its use of cranes to increase tree removal efficiency. With such a heavy, long-term workload demand, company officials saw the need for owning crane equipment.

"Both the Demag AC 130-5 and AC 160-5 crane models operated by Mowbray's Tree Service offer all-axle steering plus independent rear axle steering, which increases maneuverability for these compact five-axle cranes," Dave Kuhlman, senior sales manager, major accounts, of Terex Cranes said.

"Using the Demag cranes has allowed us to remove as many as 10-15 trees in a day, whereas with other methods, we would average about one tree a day," said Mowbray. "However, even with the cranes, we still have those jobs where we have to work at a 185-ft. radius and it takes a day or two to remove a tree."

"Cranes are designed to pick freely suspended loads and lift them into position," she said. "However, OSHA [Occupational Safety and Health Administration] and ASME [The American Society of Mechanical Engineers] both address applications in which a crane can be safely used for work such as tree removal and how to properly lift personnel in these applications."

"The tree canopy makes it dangerous to use a platform, so we use the hook block to lift the worker when there is no other way to safely get to the tree. We use a double tie-off method, positioning a lanyard through the hook block and tie-in the sling made for climbing above the hook on the line," Mowbray said.

The standards typically call for a platform to safely lift personnel at the job site, but this often is not possible when working in the high hazard zones. Therefore, a special variance has been granted to lift a worker into the tree in this manner.

"We have found it advantageous to have a person who has spent time in the tree operating the crane. It helps to have an experienced person in the seat to help determine sling placement and if the crane is able to handle the load," Mowbray said.

"We worked with North American Training Solutions [Douglass, Mass.] to deliver a safe works practices program geared toward high angle tree removal, crane safety and rigging," he said. "Using a crane to remove trees requires detailed attention to site selection, equipment selection, set-up, weight calculations, communications, rigging procedures and hazard mitigation. These all contribute to worker safety and overall efficiency."

Company foremen use a green weight load chart for determining load weight. The pre-lift plan includes measuring the length and diameter of the tree section to be cut to calculate its weight and make sure it falls within the crane's rated capacity at the boom length and radius.

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