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. g. Visually inspect all castings and weldments for cracks. 3-6. 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  truck  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. 3-4