Shares closed at $114.05 as the S&P 500 fell 0.38% to 7,337.11 and the Dow dropped 0.63% to 49,596.97.
Paccar ended 13.52% below its 52-week high of $131.88, reached on 4 February, and lagged Ford and Wabash while slightly outperforming Oshkosh.
Trading volume was 2.4 million shares, about 560,485 below its 50-day average of 2.9 million, indicating lighter-than-usual activity during the decline.
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