Quantcast Castings - TM-9-2815-247-34_72

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TM 9--2815--247--34 0012 00--4 GENERAL MAINTENANCE INSTRUCTIONS -- CONTINUED 0012 00 INSPECTION -- CONTINUED Symbols Symbols employed in the repair Standards Table are identified as follows: The letter “L”, following the tolerance dimensions given in the “Sizes and fits of new parts” column and the “Wear limits” column, indicates a loose fit (clearance). The letter “T”, following the tolerance dimensions given in the “Sizes and fits of new parts” column and the “Wear limits” column, indicates a tight fit (interference). Castings Inspect all ferrous (cast iron, steel, etc.) castings for cracks. Inspect all nonferrous (aluminum) castings for cracks. Suspected cracks in the nonferrous casting can be checked with a magnifying glass (five power magnification mini- mum) and a strong light. Check particularly the areas adjacent to studs, pipe plugs, or threaded inserts and in sharp corners and fillets. Inspect machined surfaces of castings for nicks, burrs, or raised metal. Mark damaged areas for repair. Check all mating flanges and mounting pads with a straight edge or surface plate for warpage. Inspect mating flanges and mounting pads for discoloration which may indicate persistent oil leakage. Inspect all tapped openings for stripped or damaged threads. Check all castings for conformance to applicable repair standards. Ball and Needle Bearings Refer to TM 9--214 for inspection of anti--friction bearings. Check all bearings for conformance to the applicable repair standards. Studs Inspect all studs for damaged or stripped threads, bent or loose condition, or for any signs of stretching. Dowel Pins Inspect dowel pins for looseness or damage. Mark loose pins for repair. Gears and Shafts NOTE There are no established wear limits for gear teeth and splines. Good judgment is required to determine need for replacement. Inspect all gears and shafts for cracks using a magnifying glass (item 24, WP 0103 00) and a strong light. Inspect all gear teeth and splines for wear, sharp fins, burrs, and galled or pitted surfaces. Inspect shaft and gear hub splines for damage, wear, and fit with splines on mating parts. Mating splines must match without binding or looseness. Check all gears and shafts for conformance to the applicable repair standards.


 


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