Spooky Sounds in the Haunted Factory

Spooky Sounds in the Haunted Factory

IDCON INC, a Total Resource Management Company

Posted 10/27/2025

As the lights flicker and the machines hum, strange noises echo through the factory floor. Are they signs of restless spirits—or just neglected preventive maintenance? This Halloween, step into the wriggling insides of your equipment and uncover the mechanical mysteries behind every eerie creak, rattle, and groan. Sometimes, the scariest sounds aren’t from ghosts…but from failing components.

The Curse of the Cog Belt

On-the-Run Inspection

Use a stroboscope

• Check if there is any damage on the belt, cogs may be damaged.
• Check if the belt is properly tensioned. Look for excessive sag on the slack side of the belt when it is under heavy load. If the sag is excessive, tensioning is needed.

The full standard can be found in IDCON’s Condition Monitoring Standards Volume 3.

The Ghoul in the Gear Reducer

Key Inspection

A key inspection for gear reducers is to listen for noise. The inspection should focus on a change in the sound. Use a stethoscope, if necessary. Don’t have a stethoscope? You can use a wooden stick to listen for noise. 

Excessive noise can point to misalignment, poor lubrication, worn/failed bearings, worn/damaged gear teeth.

Interpreting Creepy Noises:

Banish the Ghosts!

• Check the gear teeth on shutdown (rumbling)
• Change/refill lubricant (rumbling or squeaky)
• Check gears next shutdown (erratic noise & backlash)
• Disconnect the output coupling and run drive, if noise changes or disappears, system is the cause (erratic noise & backlash)
• Take unit apart on shutdown, check for shiny spots on gear. (erratic noise)
• Make mechanical blue imprint (erratic noise)
• Check gear clearance with lead or plastic wire (erratic noise)
• Consult system expert (Torsional problem)
• Check axial float (smooth)
• Tighten bolts, check foundation condition (smooth or incidental)

Even though the gear reducer is making noise, be sure the condition isn’t caused from other system problems, such as fluctuation in drive speed or coupling wear.

For more on how to inspect and care for the Gear Reducer, purchase IDCON’s Condition Monitoring Standard Volume 1.

When the night shift grows quiet and the only sound is a rhythmic thump or whispering whine, don’t let your imagination run wild. The true monsters of the factory are misalignment, poor lubrication, and loose bolts—waiting to strike when you least expect it. Keep your inspections sharp, your tools ready, and your reliability and maintenance program strong—because in the haunted factory, preventive maintenance is the best ghost buster.

IDCON INC, a TRM Company

IDCON INC, a TRM Company provides side-by-side reliability and maintenance consulting and training designed to keep your equipment running. For over 45 years, they have partnered with hundreds of manufacturing plants around the world to eliminate the costs and the pressure caused by unreliable equipment.

They offer in person and online reliability and maintenance, spare parts management, planning and scheduling, shutdown/turnaround optimization, preventive maintenance and root cause problem elimination training; strategic consulting and coaching; and provide a number of free online resources. Run your plant, don't let it run you.

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