Abstract: In a central lubricating installation which is primarily intended for commercial vehicles the running time of the pump unit (2) supplying lubricant to the lubricant distributors (6, 7) is controlled as a function of the starting-current intensity, corresponding to the ambient temperature, of an electric motor (3) serving to drive the pump unit (2).

Abstract: In a central lubricating installation which is primarily intended for commercial vehicles the running time of the pump unit (2) supplying lubricant to the lubricant distributors (6, 7) is controlled as a function of the ambient temperature, determined by means of a temperature sensor (23).

Abstract: In a device for controlling the function of central lubrication installations with two electrically conducting components (8, 9) integrated into a signal circuit, a contact piston (18) provides the electrical contact between these components (8, 9). The contact piston (18) is guided with zero play in a bore (17) of one of the components (8, 9). It has a sealing section (19) which, in the working position of the device, is bypassed by two side ducts (24, 26) and a connected duct (25). One (24) of the connecting ducts (24, 26) emerges at a position in the bore (17) serving to guide the contact piston (18), which position is sufficiently far removed from the outlet opening of a flow duct (22) that lubricant can only flow through the device when a comparatively large distance has been established between one component (9) and the contact piston (18).