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News » US » Cat launches trio of new planers » published 30 Oct 2017

Cat launches trio of new planers

Caterpillar has introduced three new cold planers – the PM820, PM822 and PM825.

The new half-lane milling machines have been designed to carry out controlled full-depth removal of asphalt and concrete pavements in a single pass.

Operating weights for the new models range from 79,630lb to 82,650lb, and cutting widths from 79 inches to 98.6 inches.

All three new machines use the Cat C18 Acert engine, rated at 755hp, meeting EPA Tier 4-Final/EU Stage IV emission standards. They are iso-mounted to reduce vibration.

The PM820, PM822, and PM825 are hydrostatically driven by two variable-displacement propel pumps supplying oil to a variable-displacement motor at each track.

All three models use a four-post design, with each leg post featuring an auto-leveling function that provides smooth height adjustment without stepping.

The rotor is equipped with three-piece, quick-release tool holders and carbide-tipped cutting bits arranged in a chevron pattern for maximum breakout force. Optional rotor systems are available, as are Cat Diamond Bits for enhanced cutting performance in specific applications. The cutting chamber has been designed to facilitate material flow, reduce wear on the chamber, and provide flush-cutting capability.

Chamber side plates move via independent hydraulic cylinders equipped with position sensors, ensuring that the side plates float at the proper level and eliminate binding. The hydraulically operated anti-slab device has been designed to protect the collecting conveyor and ensure an optimum discharge opening to the rotor chamber.

Three cutting settings, controlled electronically from the keypad, are available to match rotor speed/torque with operating conditions.  

The PM820, PM822, and PM825 can be equipped with the optional, integrated Cat Grade Control system, which is a 2D-capable/3D-ready grade-and-slope system that automatically controls a preset rotor depth and cross slope. The system can be enhanced for full 3D control with the addition of optional equipment.

Cat Grade Control can be configured with contacting or non-contacting grade sensors including Cat sonic sensors and mounting hardware, the side plate position or optional inboard ski. Machines can be set up either to control grade on both sides, using any combination of sensors, or, set up to control grade on one side and slope on the other. The system allows changing sensor arrangement during operation with simple commands.

The position-sensing technology, coupled with the Cat Grade Control system, provides the machine with additional functions, such as an automatic plunge-cut feature that eases the rotor into the start of the cut.  


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This article was published on 30 Oct 2017 (last updated on 30 Oct 2017).

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