8.  Rotation  pressure  gauge:  This  gauge  indicates the  rotation  pressure  during  drilling. 9.  Blow  pressure  gauge:  This  gauge  indicates discharged  air  pressure. 10. Blower control lever: This lever controls the amount of air going through the drill steel to clear the cuttings from a borehole. When the lever is turned towards  the  operator,  the  blow  volume  increases gradually. When the lever is turned away from the operator,  the  valve  is  opened  fully. NOTE:  When  drilling,  open  the  blower  control lever  fully. 11.   Boom   extension   control   lever:   This   lever extends  and  retracts  the  boom. 12. Boom lift control lever: This lever raises and lowers the boom. 13. Boom swing control lever: This lever swings the boom left or right. 14. Guide dump control lever: This lever controls the  180-degree  forward  and  backward  movement  of  the drill guide. 15. Guide swing control lever: This lever controls the swing of the drill. The maximum swing of the drill guide is 45 degrees to the left and 45 degrees to the right. 16.   Guide   extension   control   lever:   This   lever extends the drill guide for an additional extension of up to 5 feet. 17.  Anti-jamming  system  on-off  control  valve: During  operation,  the  anti-jamming  system  assists  in keeping the drill steel from jamming in a borehole. 18.  Vaposol  system  on-off  valve:  During  operation, from  a  40-gallon  storage  tank,  the  vaposol  system throws a mist of water down the drilled hole to control dust. It can also be used while drilling to prevent a cave-in from loose material in a borehole. 19.  Needle  valve:  The  needle  valve  controls  the amount of water to be injected into the blow air. 20. Panel lamp switch. Positioning for Drilling Positioning the rock drill is performed as follows: 1.  Position  the  rock  drill  by  using  the  traction levers. 2.  Place  the  crawler  chassis  in  a  horizontal position,  when  possible,  by  using  the  track  oscillation levers, and then set the oscillation lock handles to the drilling position to keep the rock drill stable while drilling. NOTE: The  drill  operator  should  approach  marked boreholes  straight  on  as  much  as  possible. 3. Position the drill guide over the spot to be drilled. 4. Extend the guide down until the second or third track roller is just off the ground. Position the drill guide inward towards the rock drill to compensate for the pressure and angle of the boom when in position for drilling. 5. Before drilling, you must ensure the guide is vertically level by using a builders level on the front and side. Drilling Operation Before drilling, make sure the gauge  indicates  100  psi.  Drilling follows: blow  air  pressure procedures  are  as 1. Open the blow control lever to admit air through the drill steel and bit. NOTE: Two types of drill bits, used in thr NCF, are the roller bead and carbide insert. 2. Start forward rotation  by  pushing  the  control lever  toward  the  console. 3. Push the drill lever toward the console to start the  drifter  conclusion. 4.  Push  the  slow  feed  lever  to  collar  the  hole. Collaring should be carried out by alternately moving the feed lever up and down until the bit has penetrated 3 to 4 inches into solid rock. NOTE: Make sure the hole does NOT deflect from the  desired  hole  direction. 5.  After  a  successful  collar  is  made,  push  the rotation lever and the blow lever all the way, then push the feed lever. NOTE: Speed of drilling and rotation is automatic according to the density of the rock formation. The harder the rock, the faster the unit will drill. Use the control  lever  for  the  desired  speed. CAUTION Pay  attention  to  the  vibration  of  the hydraulic hose in the drill. If the hose vibrates abnormally,  the  accumulator  of  the  drill  is 14-20