TM10-3930-660-20 HYDRAULIC SYSTEM (cont’d) FRAME TILT CYLINDER. This cylinder is controlled by the frame tilt control joystick. When the lever is moved forward, pressure oil from the hydraulic oil reservoir causes the cylinder to retract and tilt the vehicle to the left. Pulling the lever back causes the cylinder to extend and tilt the frame to the right. BOOM HOIST CYLINDERS. These are two cylinders controlled by the boom hoist control joystick. When the lever is moved forward, pressure oil from the hydraulic oil reservoir causes the cylinder to retract. Moving the lever backward causes the cylinder  to  extend. 1-15/(1-16 Blank)