TM10-3930-660-20 1-20. HYDRAULIC  SYSTEM HYDRAULIC OIL RESERVOIR. Contains oil for the entire system. HYDRAULIC OIL FILTER. Removes smaller harmful particles from the oil before the oil returns to the reservoir. MAIN CONTROL VALVE. Located on the engine (near  back  of  transmission).  Controls  the and extend/retract. MLRS ATTACHMENT CONTROL VALVE. Mounted in compartment bulkhead of the main frame two boom functions: boom hoist/lowering the attachment and is controlled by an electrical joystick and electrical cable down the length of the boom. Controls the three attachment functions: hoist/lowering, fork tilt, and fork side shift. FRAME TILT VALVE. Mounted inside the console located to the right of the operator’s seat. Controls the tilting of the vehicle frame. HYDRAULIC following DUAL GEAR following JOYSTICK CONTROL VALVE. Located on the side console in cab. Controls the boom functions: raise, lower, extend, and retract. PUMP . Mounted to the transmission. This two section pump supplies the functions: boom hoist, boom extend, steering, brake and frame tilt. PISTON  PUMP. Mounted to the transmission. This pump supplies the following functions: attachment hoist, fork tilt, left fork control, right fork control, load side  shift  control. EMERGENCY PUMP AND MOTOR. Located between the vehicle forward of the transmission. This pump supplies 5 gpm (19 l/rein) of emergency flow to the steering system whenever the ignition is on and there is a loss of hydraulic and engine oil pressure. The pump is driven by an electric motor. FORK SIDESHIFT CYLINDERS. These are two cylinders controlled by one joystick control. The joystick controls sideshift, the left fork and right fork functions. Both cylinders can be operated at the same time to sideshift forks left or right, to move forks together or apart. Also, the cylinders can be operated individually. CARRIAGE TILT CYLINDERS. These are two cylinders controlled by the fork tilt joystick  control. Moving the lever to the right causes the cylinders to extend and the fork tips will raise. Moving the lever to the left causes the cylinder to retract and the cylinders will lower. ATTACHMENT HOIST CYLINDER. This cylinder is controlled by the attachment hoist control   joystick. When the lever is pushed forward, pressure oil from the hydraulic reservoir causes the cylinder to retract. When the lever is pulled back, the cylinder will extend and raise the MLRS attachment. BOOM EXTEND CYLINDER. This cylinder is controlled by the boom extend and retract joystick  control. Moving the lever to the left causes the cylinder to retract and moves the MLRS attachment near to the vehicle. Moving the lever to the right causes the cylinder to extend and increase the reach distance or the height of the forks, depending on the angle of the boom. 1-13