Demag is a long-trusted brand of powerful all-terrain and crawler cranes. The Demag HC series is known as a workhouse on construction sites, and H. Brown is proudly offering a Demag HC 1020 hydraulic truck-mounted crane for sale. The updated price for the crane (pictured below) is $550,000.
This telescopic truck crane, made in 1990, has 171 feet of main boom, 118 feet of fixed jib and 177 feet of telescopic lattice swingaway jib. It has two hydraulic hoist drums (one for the main hoist and another for the auxiliary or whip line) serving as the crane’s hoisting mechanism. The crane also comes with a hook block and ball lift system.
“Demag” stands for “Deutsche Maschinenbau AG,” based in Zweibrücken, Germany. The year our HC 1020 was made was the year Demag introduced the strongest telescopic truck crane worldwide, with a lifting capacity of 500 metric tons. In 1998, they launched their most robust telescopic truck crane, with a 650-metric-ton capacity. The discontinued Demag HC series were truck mounts known for their strength and versatility.
The Low-Down on Boom Trucks
Whereas an articulated (or “knuckle boom”) crane uses a hook on the tip of the boom to lift loads, telescopic truck-mounted cranes (sometimes called “boom trucks”) use a hydraulic winch as the primary lifting mechanism.
Regardless of the lifting radius, the winch makes it easy to gently and accurately place a load. During a lift, energy transfers from the winch to the lift cylinder and crane structure. The winch features holding valves that make it possible to suspend heavy loads for extended periods of time without “drift.” Wire rope also facilitates accurate load placement.
With a boom truck, moving a load to a different radius is done by raising and lowering the boom—not by telescoping it.
The boom is a series of symmetrically cross-sectional segments fitted into each other. The largest segment, at the bottom of the boom, is called the “base section,” or “boom butt.” The smallest section, at the top of the boom, is called the “tip section” or “boom tip.” In between, there can be one or more sections that are extended and retracted with hydraulics. With the boom fully retracted, these cranes are highly maneuverable and easy to transport to job sites.
A telescopic or fixed jib extension on a telescopic boom can extend the reach of the crane boom by as much as 55 feet. With a jib, boom truck cranes can reach boom lengths up to 201 feet. That makes them great for placing loads at height.
A work platform can even be used to lift crew members to working heights up to 207 feet in the air. The operator just has to elevate the boom and telescope out. The extension can be removed as needed and stores on the side of the boom when it’s not in use. Because of the enclosed boom design, sensitive hydraulic cylinders and components are subject to less damage from the elements.
The counterweight gives this crane greater lift stability. When performing near-capacity lifts at high boom angles, about 60 percent of the load weight is placed on the outriggers (away from the load).
In most telescopic cranes, the primary carrier engine drives the hydraulic pump that supplies the hydraulic fluid to power all crane functions. Power is diverted to hydraulic motors or cylinders by the valve body at the operator’s cabin. As with most boom trucks over 30 tons, the HC series features enclosed operator cabins with heat and air conditioning.
Courtesy of Flickr user https://www.flickr.com/people/-jon/
If you’re interested in learning more about this crane or our other used mobile cranes and heavy-haul equipment, contact us via our online form.