Injection Molding | 1 MINUTE READ

When It Comes to Maintenance Trust Your Nose (and Ears and Eyes)

An ever-growing number of sensors on injection molding machines provide real-time transparency into a press’s inner workings, but the low-tech sensors humans come with are still vital to keeping a plant running.


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In the same way a pilot inspects an aircraft prior to a flight, John Wiley believes machine operators would benefit from a walk around at the start of their shift. Business development manager at Engel, Wiley has worked on the care and maintenance of production equipment at both the processor and OEM level for the past 34 years. He shared his three-plus decades of experience in a webinar on machine maintenance.

During that habitual walk around, Wiley says machine operators should use their eyes, ears and nose to sniff out, sound out, and spot out issues while they’re still small. “Our sense of smell can identify a lot,” Wiley said. Do you smell plastic burning? There could be a nozzle leak. Is there a burning rubber smell? Likely to be an electrical issue. Can you smell hydraulic oil? Hydraulic fluid is leaking from somewhere.

Listening to a machine can reveal a lot too, and you should trust your ears if something sounds off. The squeal of a bearing, whine of a hydraulic pump, chatter of hydraulic valve, slamming of the mold, bouncing of an ejector plate—all tell a story about your machine’s current—and likely deteriorating—health.

Wiley also stressed trusting your eyes. Many machines have collection areas for spills, if these are filling with oil—or if the operator is adding oil to the press before every shift—you should find and tag the leak to get it addressed sooner than later.

“If I’m putting oil in every day, I’ve got a leak; if the machine is overheating, the heat exchanger plugged,” Wiley said. “Walk around inspections can catch these issues when they’re small.”

Wiley encouraged attendees to be vigilant, with most of these investigations involving a “a clear site inspection with both feet on the ground.” If there is standing oil, the operator or maintenance worker should secure the machine and investigate further. “It’s far better to stop it, fix it, put it back in maintenance than it is to ignore,” Wiley said. “It’s so important that you do it in its infancy.”

Engel maintenance Human senses and vigilance are key to maintaining machine health.