TM 5-3810-306-10 3. After  engine  warmup,  shift  transmission  directional control lever from neutral (N) to forward (F) position. Release   parking   brake   and   depress   foot   throttle pedal until maximum gear speed is attained. 4. Shift transmission lever to second gear (2) position; accelerate until maximum gear speed is attained. 5. Shift   to   third   gear   (3)   position   and   accelerate   to desired travel speed. CAUTION Do not downshift to a lower gear if crane is traveling at a greater road speed than the maximum speed of the lower gear. MAXIMUM SPEED (MPH) SPEED SELECTOR Hydraulic Pump Engaged POSITION 4WD LO             2WD HI 1 1.4 3.8 2 2.8 7.9 3 7.6 19.9 Hydraulic Pump Disengaged 4WD LO             2WD HI 1 1.4 3.8 2 2.8 8.0 3 7.6 20.1 MOVING THE CRANE IN REVERSE CAUTION Apply  the  service  brakes  and  bring  the crane to a complete stop before shifting transmission direction control lever to R (reverse). Moving the crane in reverse requires the same steps as moving forward except for Step 3 where the transmission direction control lever is placed to F (forward).  Place the lever to R (reverse). FOUR-WHEEL DRIVE OPERATION If  more  traction  is  required  due  to  slipping  or  spinning wheels, engage rear axle four-wheel drive. Engage four- wheel drive as follows: CAUTION Before  shifting  from  two-wheel  drive  to four-wheel  drive  (or  from  four  back  to two) the crane must be standing still. 1. Place transmission shift lever to N (neutral). 2. Position DRIVE AXLE selector switch to 4WD LO. 3. Select    gear    speed    and    direction    of    travel    as described under MOVING THE CRANE - FORWARD. 4. Return  DRIVE  AXLE  selector  switch  to  2WD  HI  as soon as conditions allow. PARKING WARNING Always set parking brake when transmission is disengaged. 1. Stop crane with service brakes. 2. Move transmission shift lever to N (neutral) 3. Set parking brake. 2-33