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8. Front wheel lean. Allows the front wheels to be leaned against the side draft caused by the angled moldboard. The top of the front wheels are normally leaned in the direction the material comes off the moldboard. Front wheel lean is used to keep the front wheels from sliding off the desired line, to shorten turn radius, and to reduce front sliding on slopes or in turns. It allows setting the front wheels in a vertical position when working slopes or ditches for better steering control. When cutting ditches, lean the top of the tires toward the top of the ditch (toward the centerline of

the road) to help prevent sidewall and bead seating damage. When working a side slope and using articulation, lean the wheels down the slope. This technique can prevent the front axle oscillation from reaching its limit.

Using this control allows the operator to make slight steering corrections in finishing and other applications. It also allows varying the cut depth of the moldboard, and increases slope angle capability when cutting high or ditch back slopes.

Frame Articulation

Caterpillar designed articulation with the strength needed to make it a working tool much like the moldboard tip or side shift. When used properly, this important feature can broaden a motor grader’s application range and increase productivity. This release offers suggestions on using articulation, but you are encouraged to use it and determine your own uses. Keep your operations simple. Complicated maneuvers just to use articulation seldom improve machine productivity.

All articulated modes reduce the need for additional equipment at the job site. Articulation helps the motor grader quickly and easily do jobs a rigid frame unit could not do or would have difficulty doing.

Modes of Operation

Straight Frame

• Only front steering is used.

• This configuration is used by most operators. • Front steer angle is 50 degrees left or right for maximum productivity even when articulated frame is not used.

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

4

1. 2. 3.

Figure 3. Modes of Operation

1. Straight Frame, 2. Articulated Frame, 3. Crab Mode

Page 6 - Cat Motor Grader Application Guide AEGQ0947-00

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