New self-propelled scraper designs don’t come around very often, so when they do it's big news, especially for any contractor who does high-volume earthmoving.
If you’re not familiar with what these beasts of the field can do, the new Cat 651, with a push from a dozer, can load 104,000 pounds of material in 30 seconds. That’s as much dirt as a 50-ton truck can handle — and it takes at least two and half minutes to load a truck.
Cat has reintroduced its 651 Wheel Tractor Scraper with a bunch of changes, upgrades and enhancements including a new powertrain, controls, hydraulics and structure. This single-engine model offers 44 cubic yards of heaped capacity and a 52-ton rated load. It also shares the same bowl design and many components as the Cat 657, allowing contractors with mixed fleets to stock fewer repair parts and lower owning costs. It replaces the 651E self-propelled scraper, which Cat discontinued about 15 years ago.
A 629-horsepower Cat C18 engine powers the redesigned 651, which can reach speeds up to 34.8 mph. When paired with a push assist from a Cat D10 or D11 dozer, and its eight-speed transmission, the 651 can load with ease even in abrasive or rocky conditions.
The scraper’s new Advanced Productivity Electronic Control System integrates the transmission and engine drivetrain to provide smooth and responsive shifts. The electronic clutch pressure control features advanced shift control logic for smoother speed and directional shifts, while part-throttle shifting controls transmission shifts for smoother shifting between gears. Preventing loss of momentum during shifts, the shift torque management system carries higher torque through shift points.
For operator comfort, the cab on the 651 is as large as that of a twin-engine 657 and 21 percent larger than Cat’s E-series scrapers. Ingress and egress have been improved with the addition of a powered access ladder. Relocation of the HVAC system, steering column and pedal improve visibility. The new comfort seat rotates up to 30 degrees to the right for loading and offers an additional 2 inches of fore/aft movement to reduce operating fatigue. The seat’s adjustable armrest aligns with the implement control level with T-handle design for more comfortable operation.
