Page 5 - Cat Motor Grader Application Guide AEGQ0947-00

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6. Moldboard sideshift. This arrangement allows the moldboard to be sideshifted in relation to the circle assembly to increase side reach, to work around stationary objects, and for many other uses.

7. Moldboard tip. This is a very important feature:

its proper use will increase machine productivity, increase cutting edge life and could prevent machine damage.

The top of moldboard can be tipped ahead of or behind the cutting edge. This helps position the cutting edge at its proper angle to obtain the desired material cutting and rolling action. Maintaining a rolling action on the material while working will reduce horsepower required and provide maximum productivity.

Normally start with the moldboard top positioned approximately 2 inches (5 centimeters) ahead of the cutting edge. From this position, tip the moldboard forward or back to obtain and maintain the desired cutting-rolling action. Tipping the moldboard forward will increase moldboard throat clearance (distance between the top of the moldboard and the bottom of the circle). Generally, a wider throat opening allows better material flow along the moldboard in all soil types. Material buildup into the circle area may increase circle wear. It can also stop material rolling action and cause it to be bulldozed. Bulldozing material requires more horsepower, more traction, and reduces motor grader productivity.

To cut hard material or for finishing work, tip the moldboard further forward than the start position. When finishing, tip the moldboard top 4 to 5 inches (10.2 to 12.7 centimeters) ahead of the cutting edge so the cutting edge is approximately 90 degrees to the cut surface. This moldboard tip position will generally position the drawbar parallel to the finished grade. When the drawbar is parallel to the finished grade, circling the moldboard will have little effect on the cross slope being cut. The amount of tip required will change slightly depending on the machine, tire size, cutting edge size (6 or 8 inch [15.2 or 20.3 centimeters]) and if cutting edges are new or worn.

Tipping the moldboard forward or back will change cut depth or blade height off the ground across the entire moldboard length. The tip control, for example, can be used to raise both ends of the moldboard for feathering material at the end of a cutting pass or for increasing cut depth over the entire moldboard length by use of a single control.

Cutting high bank slopes or deep ditches requires more forward tip on the moldboard to obtain the proper cutting-edge-to-material contact. Attempting to cut with the moldboard in the full rear position in these applications, or with worn cutting edges, could result in difficulty penetrating and cutting the material.

N O T E

Use caution when working with the moldboard at full back tilt. Damage can occur to the moldboard tip pivots, cutting edge attachment bolts and support area for the cutting edge. This may cause a reduction in cutting edge support.

For maximum cutting edge life in road maintenance work, maintain a near constant tip angle. Frequent changes to tip position in this application result in accelerated cutting edge wear. In general, tip the moldboard rearward for heavy clays and cutting packed snow or thick ice, after first penetrating the material with the moldboard tipped forward.

In snow removal work, tip the moldboard so the cutting edges are approximately 90 degrees to the work surface. This allows the moldboard to slide over the road surface with less damage TO THE ROAD and over many obstructions without damage to the machine.

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 5 - Cat Motor Grader Application Guide AEGQ0947-00

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