What is the correct procedure for checking track sag on a heavy-duty crawler machine?

Question: What is the correct procedure for checking track sag on a heavy-duty crawler machine?

Answer options:

• Measure the distance between the top of the track shoe and the bottom of the carrier roller while the machine is at rest.
• Place a straightedge across the track from the drive sprocket to the idler and measure the sag at the lowest point. ✅ Position the machine on level ground, extend the track over the idler and sprocket, and measure the distance from the top of the track shoe to the bottom of the lowest sagging carrier roller, with a specific weight in the track.
• Measure the track sag from the ground to the lowest point of the track when the machine is lifting its attachment.

Correct answer: Position the machine on level ground, extend the track over the idler and sprocket, and measure the distance from the top of the track shoe to the bottom of the lowest sagging carrier roller, with a specific weight in the track.

Explanation: The correct procedure involves positioning the machine on level ground, ensuring the track is properly seated over the idler and sprocket, and then measuring the sag from the top of the track shoe to the bottom of the lowest sagging carrier roller, often with a specified amount of track lifted or a weight applied to ensure consistent measurement.