TM 10-3930-664-10 e. Turn the ignition switch clockwise to the ON position, then slowly turn the switch to the start position.   Release the switch as soon as the engine starts and decrease the engine speed to idle.  If the engine fails to start on the first try, wait until the engine and starter have come to a complete stop.  Then return the ignition switch to the OFF position and wait two minutes before attempting to start the engine again. CAUTION · If the oil pressure warning indicator does not turn off and there is no oil pressure within 15 seconds after the engine starts, stop the engine or serious damage may occur.  Stop the engine by turning the ignition switch counterclockwise to the OFF position. · Should  the  oil  pressure  fluctuate  or  drop  below  30  psi  (207  kPa)  or  if  the  oil  pressure  warning  indicator  illuminates, stop the engine and find the cause.  Do not operate the engine at oil pressure lower than 15 psi (103 kPa). · Continuous operation with low coolant temperature (below 140° F (66° C) or high coolant temperature (above 215° F (101° C)) can damage the engine. · If the coolant temperature exceeds 215° F (101° C) (the red zone of the gauge) stop the forklift truck, place the travel and range select lever in Neutral, "N", and check to see if the temperature returns to normal operating range with the engine at idle.  If the temperature does not return to normal operating range within five minutes, turn engine off and find the cause. f. After  the  engine  starts,  operate  the  engine  at  low  RPM  for  three  to  five  minutes  to  allow  the  engine  to  warm  to operating temperature (180° F - 210° F (83° C - 99° C)) before placing the engine under load.  Check the readings on the gauges before moving the 4KRTFL.  Return the engine to idle before moving the travel and range select lever. 2-28