Section XII.  CONTROLS, INSTRUMENTS AND PANELS 3-77.  General The  controls  and  instruments  are  primarily  located  on the operators instrument panels located on the left and right   sides   of   the   fire   truck   below   the   hose   reel compartments.    The  pump  gage  panel  is  located  near the    left    hand    instrument    panel.        It    houses    the tachometer-hour  meter  which  registers  the  engine  rpm and hours of operation.  The pump discharges pressure gage   determines   the   water   discharge   pressure,   and hydrant  pressure.    Throttle  controls  located  on  the  left instrument panel operate the engine speed.  The apron is  mounted  on  the  special  purpose  body  at  the  rear  of the  fire  truck.    There  is  a  pump  compartment  bottom panel    located    below    and    mounted    on    the    pump compartment frame. 3-78.  Right Side Control Panel a.    Removal. (1) Remove the hose reel switch (para 3-67). (2) Refer to figure 3-35, and remove the right side control panel from the pump compartment. b.    Cleaning, Inspection, and Repair. (1) Clean with an approved cleaning solvent, and dry thoroughly. (2) Inspect for damaged or defective condition. (3) Replace or repair as necessary. c. Installation. (1) Refer  to  figure  3-35,  and  install  the  right side control panels on the pump compartment. (2) Install the hose reel switch (para 65). 3-79.  Left Side Control Panel a. Removal. (1) Remove the throttle control (para 3-45). (2) Remove the hose reel switch (para 3-67). (3) Remove the engine dome and pump gage control panel lights switch (para 3-65 and 3-66). (4) Refer to figure 3-36, and remove the left side  control  panel  and  bottom  panel  from  the  pump compartment. b. Cleaning, Inspection, and Repair. (1) Clean with an approved cleaning solvent, and dry thoroughly. (2) Inspect for damaged or defective condition. (3) Replace or repair as necessary. c. Installation. (1) Refer  to  figure  3-36,  and  install  the  left side   control   panel   and   bottom   panel   on   the   pump compartment. (2) Install  the  engine,  dome  and  pump  gage control panel light switch (para 3-65 and 3-66). (3) Install the hose reel switch (para 3-67). (4) Install the throttle control (para 3-45). 3-80.  Tachometer-Hourmeter a. Removal. (1) Refer   k,   figure   3-29,   and   remove   the cover. (2) Refer   k,   figure   3-37,   and   remove   the tachometer-hour meter from the pump gage panel and transfer case. b. Cleaning, Inspection, and Repair. (1) Clean with a clean cloth dampened in an approved cleaning solvent, and dry thoroughly. (2) Inspect all parts for damaged or defective condition. (3) Replace  or  repair  damaged  or  defective parts as necessary. c. Installation. (1) Refer    to    figure    3-37,    and    install    the tachometer-hour  meter  on  the  pump  gage  panel  and transfer case. (2) Refer to figure 3-29, and install cover.  3- 81.  Discharge Pressure Gage a. Removal. (1) Refer   to   figure   3-29,   and   remove   the cover. (2) Refer   to   figure   3-27,   and   remove   the discharge pressure gage from the pump gage panel. b. Inspection, and Repair. (1) Inspect for damaged or defective condition. (2) Replace  or  repair  damaged  or  defective parts as necessary. 3-48