Page 19 - Cat Motor Grader Application Guide AEGQ0947-00

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Ditch Shoulder Cleanup

As the ditch becomes deeper, material tends to roll under the tandem tires. When this occurs, the windrow must be moved off the road shoulder toward the road center line.

Do this in straight or articulated mode. The machine configuration should be:

1. Toe at the center or inside edge of front tire. 2. Front tire straddling the windrow and at desired shoulder height, and lean the top of the front wheels toward the heel of the moldboard. 3. Drawbar shifted away from the ditch, with a steep blade angle.

4. Heel outside tandem tire.

When roughing in an area or where the road shoulder and inner slope are not accurately controlled, the windrow can be moved in one pass to the outside of the opposite tandem tire. In some soils, this technique may result in material loss around the moldboard toe back onto the road ditch slope.

Drive as straight as possible on this pass to assure a straight shoulder line .

Attempting to pull too much material in one pass will cause the front end to be pulled down into the ditch destroying both the shoulder and ditch slope grade. Pull only as much as the machine can handle in a single pass. This type pass can normally be made in third or fourth gear.

Finish Shoulder Cut

Use a finish shoulder cut when a precise shoulder line is required or in dry material to prevent material from spilling back into the ditch.

Use the same method as above, but shift the circle 8 to 12 inches (20.3 to 30.5 centimeters) toward the ditch. Use a steep blade angle and extend the toe of the moldboard well beyond the windrow and very close to the front tire. Tip the blade slightly forward. Place the windrow between the tandem tires. Material cast inside the tandems must not be allowed to roll under the opposite tandem tire or the shoulder cut will be irregular. Casting material inside the tandem tire would only be done where precise cuts must be made or to reduce material loss around the toe of moldboard in dry soil. Normally material would be cast outside the tandem tire.

This pass is normally made in third or fourth gear. Both tandems must be on a smooth surface for good results.

Articulated Shoulder Cuts

There are three articulated frame techniques that are useful for moving large shoulder windrows. These modes will normally allow the motor grader to move the entire windrow in a single pass rather than using multiple passes. The first two techniques are performed with the centershift pin in the center position. The last technique described requires repositioning the linkbar. With large shoulder windrows or when roughing in the ditch, larger loads may be moved by using articulated frame. (These methods also work well in wet slabby material where the material does not slide along the moldboard as desired.) See photos 1, 2 and 3 on page 18.

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 19 - Cat Motor Grader Application Guide AEGQ0947-00

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