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General Inspection Instructions.
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GENERAL MAINTENANCE PROCEDURES - Continued
TM 5-4210-220-12 4-9.  GENERAL MAINTENANCE PROCEDURES - Continued 4-9 3 General Inspection Instructions - Continued e. Splines Inspect shaft splines for wear. This will include pitting, peening or fatigue cracks.  Perform magnetic particle inspection if needed. f. Electrical Parts Inspect all wiring for chaffed or burned insulation.  Check all terminals for tightness.  Check all lamps for failure.   Check for burns, or broken fittings or components. g. Gears The following steps should be used to make a general visual inspection of all gears.  Specific tests for particular gears, outlined in the text, should also be carried out if any gear looks faulty, perform a surface temper and/or magnetic particle inspection. (1) Normal  Wear.    Loss  of  metal  from  surface  of  teeth.    Wear  must  not  prevent  gears  from  meshing  or performing properly. (2) Initial Pitting.  This may occur when gears are first put into service it may continue until high spots have been reduced it will not affect contact surfaces.  This pitting is not necessarily serious. (3) Destructive Pitting.  This pitting occurs after initial pitting, often at an increasing rate.  This type will destroy the contact area and reduce the load capacity of the gear.  Rapid destruction will occur with use. (4) Abrasive  Wear.    This  damage  is  caused  by  fine  particles  carried  in  the  lubricant  or  embedded  in  gear tooth.  This material may come from: Bearing or gear tooth material Abrasives not removed during assembly Sand or scale from castings Impurities from oil or the environment (5) Scoring.  Slight scoring, galling or other surface damage is seen as tears or scratches in the direction of sliding.  It starts in areas of highest stress and speed.  This is usually at tip of teeth. (6) Burning.  Burning is seen as discoloration, and causes loss of hardness of the metal.  Burning is caused by any of the following: Gear Overload Overspeed Lack of Backlash Too Little Lubrication Wrong Lubrication 4-62

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