TM 10-3930-671-24 (5) Slight  scoring  (scuffing,  seizing,  or  galling).    This  may  be  a  minor  impairment  of  surface,  or  of  a  welding nature showing slight tears and scratches in direction sliding.  It starts in areas having high combinations of surface stress and sliding velocity.  It usually occurs at or near the tip of the tooth. (6) Burning.  Discoloration and loss of hardness from excessive temperature.  This is caused by friction resulting from overload, overspeed, lack of backlash, or faulty lubrication.  If discoloring can be wiped off with a clean cloth, it can usually be traced to oil bum stains which are not usually serious. (7) Rolling.    This  is  a  form  of  plastic  yielding  (continuous  and  permanent  deformity  in  any  direction  without rupture).  This results from heavy, even loads and sliding. d. Inspect shaft splines for wear, pitting, rolling, or peening and for fatigue cracks.  In many instances,  the same inspection procedure will apply as for gears.  However, the condition will usually be much less pronounced. e. Check all hose surfaces for deterioration and signs of fatigue.  Check for breaks caused by sharp kinks or contact with other parts of the forklift.  Inspect tubing for kinks.  Check for leaks. f. Inspect  all  wiring  harnesses  for  chaffed  or  burned  insulation.    Inspect  all  terminal  connections  for  loose connections and broken parts. e. Visually inspect all castings and weldments for cracks. 5-6. GENERAL REPAIR INSTRUCTIONS. a. Remove burrs from gear teeth with a fine-cut file or hand grinder. WARNING Compressed air used for cleaning purposes must not exceed regulated 30 psi (207 kPa).  Use only with  effective  chip  guarding  and  personal  protective  equipment  (goggles/shield,  gloves,  etc.)  to prevent injury to personnel. b.  Starter commutators may be polished in a lathe using a strip of 00 sandpaper.  After polishing, blow dust and residue from commutator with compressed air. c.    Chassis  and  exterior  painted  parts  may  be  resurfaced,  where  paint  is  damaged  or  where  parts  have  been repaired, by using an abrasive disc. CAUTION Precautions should be taken to guard other parts of the forklift from abrasive dust.  Do not work near exposed parts and openings which would allow the dust to reach working parts. d.  Remove residue and oil stain from bearing races with crocus cloth. e.  Before resurfacing, scrape all loose and blistered paint from damaged areas.  Sand or buff area to be painted. Remove residual cleaning material with paint thinner and dry thoroughly. 5-4