What is the primary cause of 'crabbing' in a grader, and how can it be used effectively?

Question: What is the primary cause of 'crabbing' in a grader, and how can it be used effectively?

Answer options:

• Operating with worn tires; it makes the grader drift uncontrollably. ✅ Intentionally offsetting the rear frame from the front frame using the articulation joint; used to counteract side draft or for specific grading patterns.
• Driving too fast on a curved path; it causes centrifugal force.
• Improper blade setting; it causes the machine to move sideways unintentionally.

Correct answer: Intentionally offsetting the rear frame from the front frame using the articulation joint; used to counteract side draft or for specific grading patterns.

Explanation: Crabbing is an advanced grader technique where the operator articulates the machine to offset the rear wheels from the front, often to counteract the side draft of a heavily loaded blade or to get the tires outside the working path, improving visibility and control.