An industrial truck, in particular a reach truck or reach-fork truck, has a maintenance opening. At least the following components are accessible through the same maintenance opening: at least one electric connector (10, 16, 17), a hydraulic tank (4) for level monitoring and/or for topping up hydraulic fluid, and electrical fuses (9). Furthermore, a brake fluid container (7) can be accessible through the maintenance opening for level monitoring and/or for topping up brake fluid, as can a hydraulic oil filter (5). The maintenance opening can be closed with a door, preferably with a folding door (1).