ENGINE AR-COMPLETE 2121621 - Caterpillar

Introduction
The AccuGrade - Laser System is a high technology earthmoving tool that allows the operators to grade and fill with increased accuracy without the use of traditional stakes, stringers or grade checkers. Using advanced laser technology, machine mounted components and an off-board laser transmitter, this state-of-the-art blade control system provides precise elevation information on the display LCD in order to achieve accurate machine and blade positioning.Traditional Grading
With traditional grading, grade information is typically provided by engineers via a wooden stake in the ground with elevation markings. A grid pattern of stakes covers the site, typically on a 8 m (25 ft) grid. Using either conventional surveying methods or lasers, the grade stakes are manually placed by the engineers. The machine operator then grades using hand/eye coordination by looking at the mark on the nearest stake and attempting to place the cutting edge of the blade to that elevation, carrying the grade to the next stake. Typically, a grade checker on foot walks along with the machine. The grade checker acts as an inspector, measures how close the operator achieved grade and indicates verbally or via hand signals, or by marking with spray paint where grade is too high as a "cut", and where the grade is too low as a "fill". Work progresses until the desired grading tolerance is achieved.Laser Grading
Setup and operation is easy with the AccuGrade - Laser System. An off-board tripod mounted laser transmitter emits a thin beam of light that rotates 360° creating a grade reference over the work area. Grade information is transferred to the machine via the laser beam.A digital laser receiver, mounted on an electric telescopic mast above the machine's cutting edge, detects the laser beam's elevation and sends the information to the display.AccuGrade is available with a single mast system or a dual mast system. The single mast system and the dual mast system both provide single dimensional (elevation) control. For example, a flat plane or a single sloped plane. The dual mast system provides two-dimensional control. For example, a sloped plane with cross slope (elevation and tilt).
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The display informs the operator of the blade's position relative to grade and indicates cut or fill requirements of the work area.An automated blade control feature allows the operator to automatically control the lift function (single mast system) or both the lift and tilt (dual mast system) functions by placing the cutting edge to the precise elevation needed for fine grading.The "AccuGrade - Laser System" provides valve drive signals for automatic blade control. The valve automatically raises or lowers the cutting edge based on the correction signals to maintain elevation for precise grade control and optimum productivity.Unique control functions allow the system to be user configured to suit operator preference and specific job site requirements.Applications
The AccuGrade - Laser System is designed for fine grading of sites with flat, single or dual slope surfaces.This manual describes the uses of the AccuGrade - Laser System. The rugged AccuGrade - Laser System is a reliable