Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A rock crusher's primary jaw shows increased current draw and reports of intermittent 'rough running'. Vibration analysis indicates a consistent, high amplitude peak at approximately 2 times the main shaft rotational speed. Based on this, which issue is most likely causing the problem?
Vibration at 2 times rotational speed, commonly referred to as 2X RPM, is often a strong indicator of looseness in components such as bearing housings, foundati
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Question: A rock crusher's primary jaw shows increased current draw and reports of intermittent 'rough running'. Vibration analysis indicates a consistent, high amplitude peak at approximately 2 times the main shaft rotational speed. Based on this, which issue is most likely causing the problem?
Answer options:
- A misaligned drive coupling.
- An unbalanced flywheel or eccentric. ✅ A loose eccentric bearing housing.
- Wear on the jaw plates.
Correct answer: A loose eccentric bearing housing.
Explanation: Vibration at 2 times rotational speed, commonly referred to as 2X RPM, is often a strong indicator of looseness in components such as bearing housings, foundations, or assembly bolts, which allows for increased movement at that frequency. Misalignment typically shows 1X and axial vibrations, while unbalance is primarily 1X radial.
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