Gradall Discovery Series excavators are mounted on Freightliner M2 chassis, with frames bulked up to handle the bending stress of excavator operations. The chassis allows for a lower cost, about 20 percent less than Gradall’s current smallest model.
The excavator remains mobile both on and off pavement with a two-axle chassis with a reinforced frame and a modified rear suspension, specifically designed in collaboration between Gradall and Freightliner engineers.
Model D152 is a two-wheel-drive, 15-metric-ton unit, and the D154 is a four-wheel-drive model. The Cummins 6.7-liter diesel has 220 gross horsepower and 520 lb.-ft. of torque, and i paired with an Allison automatic transmission for a maximum roading speed of 55 mph. The boom has two overlapping sections, and it tilts 220 degrees and telescopes to 27 feet 10 inches. The telescoping boom movements also enhance Gradall’s traditional low working profile that allows it to work under bridges, in tunnels, under trees and signage, and in other low-overhead situations.
Approximate lifting capacity at full reach is 3,000 pounds; 6,000 pounds with the boom in. Tail swing is near-zero, which enables it to work alongside roads with minimal traffic flow interruption, Gradall says. For full working stability, the units have front axle lockout cylinders and do not require outriggers.
Authorized attachments include grading buckets, pavement removal bucket, excavat- ing bucket, grapple, tree limb shear and mower, some using optional boom-end remote hydraulics.
The units feature a Bosch Rexroth hydraulic system with pressure-compensated, load-sensing valves with reliefs on all circuits. Remote control allows the operator to move the truck while in the excavator cab.
The operator cab has an all-electric joystick control that allows the operator to reposition or move the machine at speeds up to 7 mph.
The chassis cab is a standard Freightliner M 2 day cab with two fixed or air ride seats. A 2,500-square-inch tinted windshield and downward sloping aerodynamic hood provide a wide-open view to the front and sides of the cab. The ergonomically designed interior has an automotive style flat dash with easy-to-read LED backlit gauges and easy-to-reach controls..
Gradall D152, D154 Excavator Specifications
- Operating weight: 32,300 pounds
- Maximum dig depth: 14 feet 6 inches
- Dump height: 11 feet 5 inches
- Gross power: 220 horsepower @ 1,900 rpm
- Boom force: 18,143 pounds
- Bucket breakout force: 12,000 pounds
- Maximum lift capacity: 5,950 pounds