TM 10-3930-659-10 2-2.  CONTROLS AND INDICATORS (Con’t). BOOM AND FORK CONTROLS KEY Control or Indicator FUNCTION 50 Hydraulic Oil Level Indicates the hydraulic oil level visually. Sight Gage 51 Fork Control Lever Raises or lowers forks. 52 Fork Tilt Control Tilts forks forward or backward. Lever 53 Fork Spacing Control Increases or decreases fork spacing. Lever TA704479 2-9