Table 4-1 Organizational Preventive Maintenance Checks and Services Q - Quarterly Total man-hours required 7 5 Sequence ITEM TO BE INSPECTED WORK Number PROCEDURE TIME (M H) 1 BOOM DRILL CARRIAGE Inspect the feed chain for proper tension.  Adjust if necessary (para 4-23). 0.5 2 DRIFTER DRILL CRADLE Inspect the wear plates and shims for excessive wear. 0.5 3 CENTRALIZER Inspect the centralize bushings for excessive wear.  Replace defective bushings (para 4-24). 0.3 4 HYDRAULIC HOSES Inspect hydraulic hoses for leaks or other damage.  Replace defective hoses (para 4-15). 0.5 5 AIR HOSES Inspect the air hoses for leaks.  Tighten loose fittings or replace defective hoses (para 4-18). 0.5 6 HYDRAULIC CONTROL VALVE Inspect the hydraulic control valve for leaks and proper operation. 0.2 7 HYDRAULIC PUMP Inspect hydraulic pump for proper operation and leaks Tighten loose fittings, replace a defective pump (para 4-15) 0.5 8 AIR MOTOR Inspect the air motor for proper operation and leaks.  Check the motor exhaust air for presence of atomized oil.  Adjust airline lubricator (para 3-20).  Replace a defective air motor (para 4-21). 1.3 9 DRILL AND FEED CONTROL VALVE Inspect the drill and feed control valve for leaks and proper operation. Tighten loose connections, replace a defective valve (para 4-18). 0.5 10 DRILL MOTOR Inspect the drill motor for proper operation.  Make sure it travels freely on the boom. 0.5 11 FEED CHAIN Check the feed chain for proper tension.  Proper tension is a 2 inch deflection between the front and rear sprockets.  Adjust as required (para 4-23). 1.2 12 FEED MOTOR Check the feed motor for proper operation.  Inspect the gear case for leaks.  Report a defective feed motor to direct and general support maintenance. 0.5 13 TRAMMING MOTORS Inspect the tramming motors for proper operation and leaks. . Report a defective tramming motor to direct support maintenance 0.5 14 FINAL DRIVE Inspect the final drive and drive sprockets for insecure mounting. Tighten or replace hardware as required. 0.5 15 TRANSMISSION BREATHER Refer to LO .53820-241-12 and service the transmission breather. 0.5 Section V.  ORGANIZATIONAL MAINTENANCE TROUBLESHOOTING 4-12. General Refer to paragraph 3-5 introductory information and the purpose of troubleshooting. 4-13. Troubleshooting Table Table 4-2 lists the organizational maintenance troubleshooting malfunctions, tests or inspection and the recommended corrective action. 4-10