WILLIAMSTOWN —Hino Motors’ Williamstown plant plans to increase production, according to a company official. Sandy Ring, general manager of external and legal affairs for Hino Motors Manufacturing USA, said the company plans to temporarily increase production, beginning next month. The facility will step up production to about 20 trucks a day, but the increase is not yet a long-term action. “We are going to increase moderately to significantly,” Ring said. “It is difficult to say how long that will last, based on forecasts for the near term.” Ring said the site has depleted its inventory and is responding to the current forecast. Some temporary workers will be hired to keep up with the increase in production. Ring said the increase or decrease of production is not a day-to-day event. He said it takes days to set up the site’s production line to produce a set amount of trucks a day. Hino’s line will be recalibrated to produce 20 trucks a day beginning in Decembe.