TM 10-3930-664-10 c. Changing Gear Ratios. WARNING Downshift at high speeds can cause equipment damage, loss of load off forks, and personal injury. CAUTION · Operating the 4KRTFL with a heavy load in F3 or R3 gear ratios will cause torque converter to slip excessively and the transmission may overheat. · Upshifting and downshifting should be done in the normal sequence of speeds. · The  gears  should  be  engaged  only  after  reaching  the  top  speed  of  the  next  lower  gear.    If  necessary,  the 4KRTFL should be slowed by using the service brakes. (1) To accelerate to desired speed, it may be necessary to shift to a higher gear ratio (F2 or F3, R2 or R3).  A shift to second or third speed forward (F2 or F3) from the next lower speed (F1 or F2) or to second or third speed reverse (R2 or R3) from the next lower speed (R1 or R2) can be made at full throttle, under load. (2) When downshifting, do not over-rev the engine.  Downshift to first or second speed in either direction may be made at full throttle, under load providing the 4KRTFL is not exceeding the maximum speed attainable in the next lower gear ratio. d. Changing Direction of Travel. WARNING Do not stop quickly.  The load may drop off the forks causing damage or personal injury. CAUTION The 4KRTFL should be brought to a complete stop prior to shifting the travel and range select lever from one  direction  to  the  other.    The  engine  should  be  at  idle  speed  when  shifting  from  one  direction  to  the other. (1) Depress the service brake and inching pedal to bring the 4KRTFL to a complete stop. (2) Move the travel and range select lever through neutral, "N", to the lowest gear ratio of the new direction of travel. (3) Release the service brake and inching pedal and depress the accelerator pedal to control 4KRTFL speed in the new direction. e. Inching  Procedure.    The  inching  feature  may  be  used  to  slowly  move  the  4KRTFL  forward  or  backward.      To precisely position the forks for lifting or depositing a load or to maneuver the vehicle into or out of confined areas, use the following procedure. NOTE The  inching  feature  operates  by  gradually  declutching  the  transmission  when  the  service  brake  and inching  pedal  is  depressed  or  gradually  permitting  the  clutches  to  engage  when  the  pedal  is  released. Inching can be accomplished during a portion of pedal travel in either direction. 2-31