TM 5-5420-278-24&P0069 001RAMP BAY AND INTERIOR BAY TRUNNION REPAIR (Contd)WARNINGIf trunnion is bent or severely worn, it must be completelyreplaced. Failure to comply may result in injury to personnel.NOTEBuild-up welding on trunnion is performed if wear does not exceed1.181 in. (30 mm). The abrasion or wear may display a variety ofinclinations or crack-like features.IRB bays are made from corus aluminum ABKANTGUETE6061-T651 749572.PREPARATION1.Grind off to beyond ends of cracks on trunnion (1).2.Clean welding area with a stainless steel wire brush.WELDINGNOTEIf temperature is below 59°F (15°C), pre-heat welding area to amaximum of 302°F (150°C) before welding.1.Apply circular welding beads (refer to TC 9-237) from inside towards the outside and positionwelding beads closely. Depending upon the required build-up thickness, several circular weldingbeads must be applied.2.After welding trunnion (1), work diameter and length of trunnion (1) to dimensions provided inillustrations. Chamfer end of trunnion (1).3.Clean, treat, and paint area in accordance with MIL-T-704 TYPE B.NOTEPerform steps 4 and 5 on ramp bay trunnions equipped with wearcaps where drilling and tapping a new mounting hole is required.4.Mark, drill, and tap a M-12 x 25 threaded hole in center of trunnion (1). Install new threaded insert (2) (refer to WP 0058 00).5.Install wear cap (WP 0055 00) (ramp bay only).6.Install ramp bay or interior bay on transporter (TM 5-5420-278-10).
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