METHOD AND ARRANGEMENT IN THE CONDITION MONITORING OF GAPS AND LEAKS IN THE OPERATING DEVICES OF A POINT-CONTROLLED SET OF BOOMS IN A WORK MACHINE

The invention relates to a method and arrangement in the condition monitoring of gaps in the operating devices of a point-controlled set of booms in a work machine， in which the set of booms comprises several consecutive parts (10， 14. 16， 18) together with operating devices (101， 142， 162， 182)， and in which there are sensors (S0....S5) in the said consecutive parts of the set of booms， arranged to measure selected variables， and in which the work machine includes a control system (C) for controlling the operating devices with the aid of the data provided by the sensors (S0....S5). The position data P1(t)， P2(t)， P3(t)，... Pn(t) of the parts of the set of booms are calculated from the movements of the parts， and a control command given by the operator is converted into the direction and speed of movement of the point of the set of booms. According to the invention， the control arrangement calculated the creep between the parts from the displacement between them when there is no control command. Condition monitoring utilizes long-term monitoring.