Table 3-1.  Operator Preventive Maintenance Checks and Services for Crawler-Mounted Rock Drill Location Item Location Not Fully Mission No. Interval Item to Procedure Capable If: Check/ Service Feed System 7 Before Mounting Hardware Check for missing bolts or signs of loose- Missing or loose bolts. ness.  Notify organizational maintenance if any nuts or bolts are loose or missing 8 Before Striker Bar Check striker bar for damage and exces- Striker bar is exces- sive wear.  Both ends of striking bar must sively worn or dam- be flat and square, not chipped.  Replace aged. if necessary. 9 Before Drifter Drill Check front cap for tightness.  Do not run   Front cap is loose. drill with a loose front cap. 10 Before Feed Chain Visually check feed chain for breaks or Feed chain broken or damage. damaged. 11 Before Feed Chain Sprockets Visually check sprocket alinement.  If sprockets are not aligned, notify organi- zational maintenance. 12 Before Feedshell Visually check feedshell for damage. Visually check for wear that would inter- fere with operation. 13 Before Sprockets, Feed Chain, Visually check for excessive accumula- and Centralizer tion of dust and debris that will interfere with operation. 14 Before Centralizer Inspect centralizer bushing for wear by Excessive wear is apparent. looking for grooves in bushing or metal filings around or below centralizer (not applicable to units equipped with retrofit kit). 15 During Sprockets, Feed Chain, Visually check for excessive accumula- and Centralizer tion of dust and debris that will interfere with operation. 16 During Air Hoses Inspect air hoses for leaks, damage, or Leakage causes poor frays. performance. 17 During Drifter Drill Inspect drifter drill for proper operation. Drill should travel freely on boom feed mechanism. 5