MAINTENANCE 4.16 REPAIR WELDINGS Before carry out weld repairs, contact our Service Depart- ment ”EXCAVATORS” in order to avoid improper welding procedures. Weld repairs can cause severe damage to an entire structure if performed incorrectly. If cracks are found in the steel construction of your excavator, please inform our Service Department as soon as possible. Attach suitable information material (photos, catalog drawings etc.) showing the location and nature of the crack. GENERAL INFORMATION Welding operations can cause damage to electronic components. (Computers, Control Units, Sensors etc.), in case the welding cur- rent goes through these units.
Therefore protective measures are necessary before any weld repair is started. GENERAL PROTECTIVE MEASURES A. Observe the prevailing safety and fire prevention regulations. Before any weld repair is started, a survey should be made of the area and all safety considerations satis- fied such as fuel tanks, oil lines, electrical cables and synthetic materials. B. Attach the welding ground directly to the part that is being repaired. Do not allow welding current to go through bearings. Welding current could arc the bearings, resulting in severe damage to the bearing.
WELD REPAIRS ON MAJOR COMPONENTS OF THE EXCAVATOR Legend for illustration Z 20674 (1) Undercarriage, refer to page 471 for protective mea- sures. (2) Loader attachment, refer to page 473 for protective measures. (3) Superstructure, refer to page 475 for protective mea- sures. 469 CAUTION