Radio Kerry understands that members of a trade union representing some staff at Liebherr in Killarney have staged a work-to-rule action today.
It’s believed members of Connect which represents some electricians took part.
It’s not known what has led to the action being taken.
Liebherr has a workforce of up to 900 people.
The company has been manufacturing container cranes at the plant since 1958.
Radio Kerry has contacted Connect and Liebherr for a comment.
Local Fianna Fail Councillor John Joe Culloty says it’s understood that further industrial action is planned for next week and he is appealing for both sides to enter talks: