Abstract: A method for the maintenance or extension of the range of functions of a self-propelled machine, in particular a tandem roller, single-drum roller, rubber-wheeled roller, refuse compactor, road finisher, road milling machine, recycler or stabilizer, comprising the steps: generating a code which can be identified at a short distance by a control device of the machine either automatically by the control device after a maintenance interval has expired, or after a request by an operator for an extension of the range of functions, wherein the code contains information about at least one machine state that changes in the course of operation of the machine, identifying the code by a mobile terminal, transmitting the information contained in the code to a central server, transmitting a release code from the server to the mobile terminal, transmitting the release code to the control device of the machine, enabling the maintenance interval or the extension of the range of functions.

Abstract: A gauge is disclosed for measuring the width between opposing walls of a tapered groove forming the peripheral rim of a pulley, gear or the like. A body member includes a projection portion positionable in the groove into engagement with the opposing walls thereof, and a handle portion for facilitating manual positioning of the projection portion within the groove. A gauge member is mounted on the body member for movement relative thereto in a direction oblique to the rim to bring the gauge member into abutting engagement with the rim. Indicia is provided on the gauge member for determining the penetration depth of the projection portion within the groove as a function of the relative positioning between the body member and the gauge member.