A Heavy Equipment Technician is adjusting the track tension on a 30-tonne excavator operating in cohesive clay soil conditions. The manufacturer's manual specifies a track sag measurement of 100 mm to 120 mm when the track is lifted clear of the ground. After adjusting the idler, the technician measures the track sag at 90 mm. What action should the technician take?

Question: A Heavy Equipment Technician is adjusting the track tension on a 30-tonne excavator operating in cohesive clay soil conditions. The manufacturer's manual specifies a track sag measurement of 100 mm to 120 mm when the track is lifted clear of the ground. After adjusting the idler, the technician measures the track sag at 90 mm. What action should the technician take?

Answer options: ✅ Loosen the track tension to achieve the recommended sag of 100 mm to 120 mm.

• Further tighten the track tension to reduce the sag to a minimum of 75 mm for better traction.
• Leave the track tension as is, as slightly tighter tracks are beneficial in clay.
• Adjust the track tension to achieve a sag of exactly 150 mm for increased comfort.

Correct answer: Loosen the track tension to achieve the recommended sag of 100 mm to 120 mm.

Explanation: A track sag of 90 mm is less than the manufacturer's specified range of 100 mm to 120 mm, indicating the track is too tight. An overtight track accelerates wear on all undercarriage components, particularly leading to premature bushing and sprocket wear. Therefore, the track tension should be loosened to bring the sag within the recommended range.