Page 28 - Cat Motor Grader Application Guide AEGQ0947-00

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2. Mid mounted behind the front axle.

Its advantages, when compared to the front mounted scarifier, are better control of cut depth, improved visibility, and ability to fracture harder material. Disadvantages are interference with blade positioning, interference with material flow along the moldboard in some applications, and problems working into corners and close to objects.

3. Rear mounted ripper-scarifier.

This arrangement allows the maximum ripping capability by placing the ripper weight on the rear drive tires. It can be used to rip into corners, along walls or close to an object. The ripper shanks are used for heavy ripping; the scarifier shanks for light work where maximum surface fracture is desired. Both sets of shanks can be stored on top of the bar to give maximum lift height.

The drive tires on the first pass are on an unripped surface for maximum traction.

Tips on Use of Ripper-Scarifier

• Use straight frame mode for maximum traction. • Use minimal articulation while ripping to avoid side loading the ripper or shanks causing possible failures. Raise the ripper or scarifier out of the material before turning to prevent shank damage. Raise the unit high enough to clear all objects. • To maximize production, rip as deep as possible and to a uniform depth but avoid bulldozing with the ripper bar.

• Avoid excessive tire slippage. Use lower gears (first and second) and reduced engine rpms. • Use only the number of teeth required for material fracture. Too many teeth will prevent material penetration, bridging material between teeth and causing excessive tire slip.

• To penetrate material, lower shanks into the ground slowly while traveling in a straight line. • Cross rip only when material fracture cannot be achieved otherwise.

• Three to five ripper shanks are used in most materials. With the ripper use only one shank when ripping extremely hard material; keep this shank in the center position. If the single shank is used in the outside pockets, use extreme caution to avoid damage to the machine or ripper assembly.

Never use a single scarifier shank in hard material with the rear ripper-scarifier.

• Do not operate ripper or scarifier with badly worn or missing tips: damage to the shank will occur.

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

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Page 28 - Cat Motor Grader Application Guide AEGQ0947-00

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