MAINTENANCE 4.16 REPAIR WELDINGS 4.16.1 PROTECTIVE MEASURES BEFORE STARTING WELD REPAIRS ON THE UNDERCARRIAGE See illustration Z 20674 On standard Excavators there are no special protective measures necessary. However, the general protective measures (A and B) must be observed. On Excavators with a power unit (generator set) mounted to the undercarriage, all electrical connections between the Excavator and the power unit have to be disconnected. 471