The inspection report specifies that the tracks on an excavator should have a sag of 15 mm to 25 mm when measured at the centre of the idler-to-sprocket distance, with the machine lifted and the bucket grounded. If an operator measures 40 mm of sag, what action should be taken?

Question: The inspection report specifies that the tracks on an excavator should have a sag of 15 mm to 25 mm when measured at the centre of the idler-to-sprocket distance, with the machine lifted and the bucket grounded. If an operator measures 40 mm of sag, what action should be taken?

Answer options: ✅ Tighten the track tension until the sag is within the specified 15 mm to 25 mm range.

• Loosen the track tension until the sag is within the specified 15 mm to 25 mm range.
• Continue operating, as a sag of 40 mm is acceptable for general excavation work.
• No adjustment is needed, as this measurement is only critical for high-speed travel.

Correct answer: Tighten the track tension until the sag is within the specified 15 mm to 25 mm range.

Explanation: A sag of 40 mm is outside the specified range of 15-25 mm, indicating the tracks are too loose. Excessively loose tracks can lead to increased wear, detrailing, and reduced traction. The track tension must be tightened to bring the sag into the manufacturer's recommended range to ensure proper operation and prolong component life. (OPSWA Excavator Operator Curriculum)