TM 10-3930-669-10 Table 2-1.  Controls and Indicators - CONT. Key Control/Indicator Function 20 Main Power Switch Provides main power to the forklift electrical system. 21 Seat Belt Provides for operator safety during operation of forklift. 22 Seat Slide Lever Releases lock to allow operator's seat to be moved forward and back.  Lift lever and slide seat to desired position. 23 Seat Back Tilt Knob Adjusts tilt of operator's seat back.  Turn knob clockwise to tilt seat back forward.  Turn knob counterclockwise to adjust seat back backward. 24 Seat Tension Adjustment Lever Adjusts tension of operator's seat.  Lever has three adjustment positions.  Lever in the upright position is for a light-build person.  Lever in the center forward position is for a medium-build person.  Lever in the downward position is for a heavy-build person. 2-5