Table 4-2. ORGANIZATIONAL MAINTENANCE TROUBLESHOOTING MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. AIR PRESSURE IS LOW Step 1. Check for plugged or defective air hose. Replace air hoses (para 4-18). Step 2. Check for defective air motor. Replace air motor (para 4-21). 2. HYDRALIC PRESSURE IS LOW Step) 1. Check for defective hydraulic hoses. Replace defective hose (para 4-15). Step 2. Check for defective hydraulic air pressure regulator. Adjust or replace air regulator (para 4-20). Step3. Check for defective air motor. Replace air motor (para 4-21). 3. TRAMMING MOTOR FAILS TO OPERATE Step 1. Check for defective hose leading to tramming controls. Replace a defective hose (para 4-18). Step2. Check for leak in air lines. Tighten connection or replace hose (para 4-18). 4. DRILL MOTOR IS SLUGGISH OR OPERATES ERRATICALLY Step 1. Check for broken or ruptured air hose. Replace air hoses (para 4-18). Step 2. Check for(defective air motor. Replace air motor (para 4-21). Step 3. Check for proper air regulator adjustment. Adjust the air regulator (para 4-20). Step 4 Check for defective or binding feed chain. Adjust the feed chain (para 4-23). Replace defective feed chain (para 4-23). 5. HYDRAULIC SYSTEM INOPERATIVE OR HYDRAULIC ACTION IS ERRATIC Step 1. Check for defective air motor. Replace defective air motor (para 4-21). Step 2. Check for defective air pressure regulator adjustment. Adjust or replace air pressure regulator (para 4-20). Step 3 Check for broken or ruptured hydraulic hose. Replace a defective hydraulic hose (para 4-15). 6. BOOM TILT AND SWING ACTION INOPERATIVE Step 1. Check for defective air motor. Replace defective air motor (para 4-21). Step 2. Check for ruptured or broken air hose. Replace defective air hoses (para 4-18). 7. DRILL MOTOR FAILS TO TRAVEL ON CARRIAGE OR TRAVELS TOO SLOW’ Step 1 Check for defective air hose. Replace defective air hose (para 4-18). Step 2 Check for defective air pressure regulator. Adjust or replace air pressure regulator (para 4-20). Section VI.  MAINTENANCE OF THE HYDRAULIC SYSTEM 4-14. General a. The pneumatic rock (hill is equipped with a close circuit     hydraulic     system     that     operates     only     when hydraulic power is needled.  A pressure regulated, vane- type air motor powers  a high capacity van type hydraulic pump   to    supply    hydraulic    pressure,    as    required    for operating  the  feed  tilt  cylinder,  boom  lift  cylinder,  feed swing  cylinder,  boom  swing  cylinder  and  feed  extension cylinder.  The  hydraulic  cylinders  are  double  acting  and self locking when not in use. b. Individual   control   levers   operate   each   cylinder independently. 4-15. Hydraulic Hoses and Fittings CAUTION Before disconnecting hydraulic hoses, lower the boom and rest it on the    ground.        When    disconnecting hydraulic hoses, loosen the connection and allow the oil to bleed down, 4-11