HAGERSTOWN, Md. (WJZ)— From the board room to the assembly line, the CEO of Mack Trucks stars in this week’s episode of “Undercover Boss.”

Jessica Kartalija shows us the job is not nearly as easy as it looks.

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Tracy Sweatt has two minutes and 34 seconds to make sure each one of the Mack truck engines is greased, covered and cleaned.

“Typically it takes me 50 seconds,” Sweatt said.

She’s been doing the same job for 14 years and loves it.

“If you get up every day to go and do a job, you might as well do it well,” Sweatt said.

Now, everyone in America will see Sweatt hard at work when she is featured on the hit CBS show, “Undercover Boss.”

Sweatt says she’s seen the show several times before, but she would’ve never expected the CEO of her company to show up.

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Denny Slagle, president and CEO of Mack Trucks, was posing as an unemployed worker trying to get a job. Sweatt was supposed to show him the ropes.

“He was driving me nuts and I’ve had a heart attack and I said ‘You’re going to kill me,’ Sweatt said.

“The pace is challenging,” Slagle said. “I discovered that when you try to do things fast, you tend to mess up more.”

Based on Slagle’s performance, would he have gotten a job?

“I honestly think he would have hurt himself,” Sweatt said.

When she learned her trainee had a bigger position, she said, “I felt blessed.”

Slagle says workers like Sweatt are the heart and soul of the company.

“I was surprised by the passion that I found these ordinary people doing ordinary things,” he said.

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You can see how Slagle handles the challenges on “Undercover Boss.” It airs Sunday night 9 p.m. on WJZ-TV.