The D61EX-15 and D61PX-15 models range in operating weight from 36,840 to 41,250 lbs., and offer 4.5- to 5.0-cu.-yd. power angle tilt blades. Both incorporate Komtrax technology, which sends machine operating information to a secure web site utilizing wireless technology.

Komatsu SAA6D107E-1 Tier-3-certified air-to-air aftercooled engines provide 168 flywheel hp. An electronically controlled, variable-speed, hydraulically driven cooling fan conserves horsepower and eliminates belts and other service parts. It is reversible from inside the cab for easy radiator cleanout.

The torqflow (planetary gear, multi-disc, hydraulically actuated) transmission automatically adjusts each clutch engagement - such as gear speed, revolution and shifting patterns - per travel conditions via an Electronic Controlled Modulation Valve (ECMV). The ECMV provides smooth, shockless clutch engagement.

The units also feature the Hydrostatic Steering System (HSS), which maintains smooth, quick, powerful control in varying ground conditions during dozing.

Both the D51 and D61 models are also equipped with the low-effort Palm Command Control System.

Deere builds upon crawler line
John Deere enhances its crawler lineup with an updated crawler dozer and a new crawler loader model.

The 85,817-lb. 1050J crawler dozer offers improvements and updates to machine systems, while retaining many features of its predecessors. The unit retains the hydrostatic drivetrain, integral power management system, Auto-Trac system and heavy-duty undercarriage.

New features include a Tier-3-certified, 12-liter, six-cylinder engine that provides electronic fuel management and 335 net hp at 1,600 rpm. A full-featured hydrostatic drivetrain is controlled by a single joystick, and allows the dozer to deliver power turns under load, infinite speed control, power management, counter-rotation, dynamic braking and other benefits.

Two drive pumps and four drive motors efficiently deliver power to the ground, with two drive motors dedicated to each final drive, resulting in more steering power and over 116,000 lbs. of drawbar pull. Maximum net torque is rated at 1,254 lb.-ft. at 1,400 rpm.

A new 11.5-yd., 159-in.-wide semi-universal blade features an improved curvature and clipped corners to enhance loading and increase production.

The 755D crawler loader features a Tier-3-certified, turbocharged, charge-air-cooled, 6.8L six-cylinder John Deere 6068H engine producing 181 hp at 1,800 rpm. The single lever-controlled hydrostatic transmission offers power management, infinite speed control, power turns, counter-rotation and dynamic braking. A transmission-only decelerator operation provides full power to the hydraulics while slowing the tracks. Drawbar pull is increased by 18%.

The hydraulic system features load-sensing hydraulics that deliver predictable response regardless of the load. A single hydraulic pilot control lever results in less operator fatigue and better control. Activation of the return-to-dig, boom float and boom height kick-out functions are also designed to be effortless.

A 100-in.-wide, 3.14-cu.-yd. bucket is standard, with a 2.62-cu.-yd. bucket available. The 755D is capable of 36,869 lbs. of breakout force and has a 31,597-lb. tipping load.