CHAPTER 3 MAINTENANCE INSTRUCTIONS Section I.  LUBRICATION INSTRUCTIONS 3-1. Detailed Lubrication Information a. General.  Lubrication of the pneumatic rock drill is covered in LO 5-3820-241-12.  Keep all lubricants in closed containers and store in a clean, dry place away from external heat.  Allow no dust, dirt or other foreign material to mix with the lubricants. Keep all lubrication equipment clean and ready for use. b. Cleaning.  Keep all external parts not requiring lubrication clean of lubricants.  Before lubricating the equipment, wipe all lubrication points free of dirt and grease.  Clean all lubrication points after lubricating to prevent accumulation of foreign matter. 3-2. Points of Lubrication Service    all    lubrication    points    at    proper    intervals    as specified on LO 5-3820-241-12. Section II. OPERATOR’S PREVENTIVE MAINTENANCE CHECKS AND SERVICES 3-3. General To   insure   that   the   pneumatic   rock   drill   is   ready   for operation at all times, it must be inspected systematically so that defects may be discovered and inspected before they result in serious damage or failure.  The necessary preventive    maintenance    checks    and    services    to    be performed  are  listed  in  Table  3-1.    The  item  numbers indicate  sequence  of  minimum  inspection  requirements. Defects  discovered  during  operation  of  the  unit  will  be noted   for   future   corrections   to   be   made   as   soon   as operation  has  ceased.    Stop  operation  immediately  if  a deficiency is noted during operation which would damage the     equipment     if     operation     were     continued.          All deficiencies  and  shortcomings  will  be  recorded  together with   the   corrective   action   taken   on   DA   Form   2404 (Equipment  Inspection  and  Maintenance  Worksheet)  at the earliest possible opportunity. 3-4. Operators Preventive Maintenance The   operator’s   periodic   (daily   and   weekly)   preventive maintenance checks and services are listed in Table 3-1. Table 3-1.  Operator/Crew Preventive Maintenance Checks and Services B - Before Operation D - During -A- After Operation Time required: 2 7 Time required: Interval and Sequence No. ITEM TO BE INSPECTED WORK TIME B D A PROCEDURE (M/H) 1 DRIFTER DRILL Inspect the drifter drill for proper operation and see that it travels freely on the boom feed mechanism. If travel is slow, adjust the backhead metering valve (para 3-19). 0.2 2 HYDRAULIC HOSES AND CYLINDERS Inspect hydraulic hoses and cylinders for leaks.  If defective, refer to organizational maintenance. 0.2 3 AIR HOSES Inspect the air hoses for leaks.  Tighten fittings.  If hoses are defective, refer to organizational maintenance personnel. 0.2 4 HYDRAULIC CONTROL VALVE Inspect the hydraulic control valve for leaks.  If defective, refer to organizational maintenance. 0.2 5 AIR MOTOR AND HYDRAULIC PUMP Inspect the air motor and hydraulic pump for proper operation and leaks.  Check the motor exhaust air for presence of atomized oil. 0.1 Adjust air line lubricator as required (para 3-20). 0.5 3-1