TM 5-4210-230-14&P-1 VEHICLE OPERATION reduce  speed  and  shift  the  transmission  into  a  lower  gear. This will provide additional braking effort from the engine. When shifting from a higher gear to a lower gear with the  vehicle  in  motion,  the  engine  and  vehicle  speed  must  be synchronized   to   permit   lower   gear   engagement.      This   is accomplished by "Double Clutching" as follows: 1. Depress the clutch pedal. 2. Place the transmission control in neutral. 3. Engage  the  clutch  and  at  the  same  time  increase  the engine speed. 4. Depress the clutch pedal. 5. Shift the transmission to the desired lower range. 6. Synchronize  the  engine  speed  with  the  vehicle  speed as the clutch is engaged. After  entering  the  downhill  grade,  reduce  the  vehicle speed   with   the   brakes   from   time   to   time   as   required,   to prevent engine speeds exceeding maximum engine rpm. Use  hard  "on-off"  brake  application  to  "snubdown"  the vehicle to keep it well under control. With the vehicle driving the engine it is possible for the engine    speed    to    reach    far    in    excess    of    the    maximum recommended rpm, causing serious damage to the engine.  In other words, on a downhill grade the vehicle should never be driving the engine any faster than the engine would normally be operating in the same gear pulling the load. ENGINE BREAK-IN Gasoline (For  Caterpillar,  Cummins,  Detroit  Diesel,  IH  DT-466, 9.0    liter    and    D-150-170-190    engines,    refer    to    separate Operator's Manual). For  the  first  400  Km  (250  Miles)  hold  vehicle  speed below 72 Km (45 Miles) per hour.  Operate at reduced speeds until  engine  is  throughly  warmed  up.    Avoid  abrupt  starts, stops and lugging of engine at any time. After  the  vehicle  has  been  driven  400  Km  (250  Miles) occasional   acceleration   up   to   the   governed   or   maximum recommended RPM is permissible and desirable. Sustained high speed driving must be avoided until the vehicle has been driven at least 1600 Km (1000 Miles). Do Not operate beyond maximum RPM at any time. ENGINE EMERGENCY STARTING CAUTION The   procedures   below   must   be   performed exactly   as   outlined,   otherwise   injury   to   the face,     eyes,     body,     limbs     and     respiratory system  could  result  from  fire  or  acid  due  to battery   explosion.      Property   damage   could also result. 1. To prevent shorting of the system, remove metal rings or  watches  and  do  not  allow  metal  tools  to  contact positive terminal of battery. 2. Place  transmission  in  PARK  or  in  NEUTRAL  and  set parking brake, in both vehicles. 3. Shut  off  lights,  heater,  air  conditioner  and  any  other electrical loads, in both vehicles. 4. Eye   protection   should   be   worn   if   available.      If   not available, shield eyes when near either battery. 5. Vehicle bodies or bumpers must not be in contact. 6. Connect jumper cable between POSITIVE posts of the CHARGED and DISCHARGED batteries. 7. Connect   other   cable   to   the   NEGATIVE   post   of   the CHARGED battery and to a good GROUND contact in the   engine   area;   not   to   the   NEGATIVE   post   of   the DISCHARGED  battery.    Ground  contact  should  be  at least twenty inches away from DISCHARGED battery. 8. Reverse  above  procedure  when  removing  the  jumper cables. IMPORTANT If   the   battery   is   a   Delco   maintenance   free type, do not attempt to jump start the vehicle, charge or test the battery if the indicator in the battery is bright or light yellow.  Install a new battery. 4