Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is adjusting the track sag on an excavator. The manufacturer's specification calls for 20-30 mm of sag when measured between the idler and the top carrier roller. The technician measures 50 mm of sag. What action should be taken?
50 mm of sag is greater than the specified 20-30 mm, indicating a loose track. To increase tension and reduce sag, grease needs to be added (pumped) into the tr
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Question: A technician is adjusting the track sag on an excavator. The manufacturer's specification calls for 20-30 mm of sag when measured between the idler and the top carrier roller. The technician measures 50 mm of sag. What action should be taken?
Answer options:
- Remove grease from the track adjusting cylinder. ✅ Add grease to the track adjusting cylinder.
- No adjustment is necessary as this sag is within acceptable limits for wear.
- Replace the track chain as it indicates excessive stretch.
Correct answer: Add grease to the track adjusting cylinder.
Explanation: 50 mm of sag is greater than the specified 20-30 mm, indicating a loose track. To increase tension and reduce sag, grease needs to be added (pumped) into the track adjusting cylinder, which pushes the idler forward. Removing grease would further loosen the track.
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