Page 12 - Cat Motor Grader Application Guide AEGQ0947-00

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Cutting edges with carbide tipped replaceable teeth are offered by several manufacturers. They generally give longer life than standard hardened edges. The Cat GraderBits™ System provides four types of tips: standard, wide, penetration and sharp.

The teeth can be individually replaced or repositioned for wear. They can be placed in a solid or serrated configuration depending on job needs.

Standard bits are used on larger units where penetration is not a problem but the material is abrasive. A wide bit is used on each end of the standard arrangement. Use of all wide bits supplies a continuous edge. (Note wide bit in photo.)

Penetration bits are used on mid sized graders and where penetration is a problem.

Sharp bits are used on smaller motor graders and where penetration is a problem.

Bit types can be mixed to customize the edge to material or conditions.

Cutting edge condition is very important for keeping the proper road profile. Cutting edges are a major expense in this application, so check their condition frequently.

Know Your Job’s Cutting Edge Requirements and Select the Proper Type for Your Conditions

For the best machine stability in road maintenance, use the widest possible pass width. Keep the moldboard angle as square to the frame as possible. If material starts to flow around the leading end of the moldboard, increase the blade angle.

Keep machine travel speed as high as possible for maximum productivity but low enough to prevent machine bounce.

The cutting width of a pass will depend on the length of the moldboard and the moldboard angle used. This chart shows the width of coverage for different length moldboards and several blade angles.

Four passes are normally required to maintain a 28-foot (8.5-meter) wide road (24-foot [7.3 meter] wide traffic lanes with 2-foot [0.6 meter] shoulders). In this application, on wider roads, blade extensions are frequently used on one or both ends of the moldboard to increase pass width and reduce the number of machine passes required. These extensions are of lighter construction than the parent moldboard.

M S E R I E S M O T O R G R A D E R S A P P L I C A T I O N G U I D E

10

M O L D B O A R D

L E N G T H

12 Foot 14 Foot 16 Foot 3.7 meters 4.3 meters 4.9 meters

30° blade angle 10.3 ft 12.25 ft 13.7 ft 3.1 m 3.7 m 4.2 m

45° blade angle 8.5 ft 9.9 ft 11.3 ft 2.6 m 3 m 3.4 m

Page 12 - Cat Motor Grader Application Guide AEGQ0947-00

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