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Figure  14-17.Pneumatic  chain  saw.
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Equipment Operator Basic - Beginning construction equipment operators manual
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Figure  14-19.—Pneumatic  drill. Figure  14-20.—Pneumatic  circular  saw. .  Wear  safety  shoes,  safety  glasses  or  impact goggles, gloves, hearing protection, and a hard hat. . Never rest an air tool on your toes. . Do not allow horseplay. . Never point an air hose at yourself or others. . Always keep both hands on the handle of the tool while operating. . Always bleed the airline before removing it from the tool. CRAWLER-MOUNTED ROCK DRILL This section provides only the basic terminology and procedures used in rock drilling operations. The extensive knowledge and skills, required to perform as an  effective  rock  drill  operator,  must  be  gained  through formal training or on-the-job-training experience. A  component  of  quarry  operations  that  contains  all items  of  equipment  needed  to  drill  is  the  crawler- mounted  rock  drill  (fig.  14-21).  This  drill  is  a  self- propelled unit, designed primarily to drill vertical and angular blast holes in rock. NOTE: Consult  the  operator’s  and  maintenance’s manual to obtain information on the type of rock drill you are assigned. MAIN FRAME The main frame  is a steel fabrication, designed to withstand the strain imposed by operation over adverse terrain. The main frame provides a mounting base for the various components of the rock drill. Track oscillation is controlled by two hydraulic cylinders,  connected  to  brackets  welded  to  both  sides  of the main frame and to brackets welded to the track frame. The   cylinders   permit   20-percent   track oscillation, dampen sudden oscillation shocks when tramming over rough terrain, and stabilize the unit when setting up on uneven ground. TRACTION  DRIVE The tracks are driven by a traction device that consists of a parking brake, an axial piston motor, a brake valve, and a planet gear reduction. The traction drive is equipped with spring-loaded, hydraulically released  brakes.  The  brakes  are  released  automatically when hydraulic fluid is directed to the motors to move the unit. The motors in the uncontrolled brake  valve,  located  within  each  of  the hydraulic circuit, prevents the unit from runaways  on  grades.  Each  brake  is 14-15







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