HARNESS AS-CAB 1018161 - Caterpillar

Standard Flow
Illustration 1 g03404903
Standard flow for the work tool hydraulic system
(1) Coupling (work tool)
(2) Tilt Cylinder
(3) Hydraulic Oil Tank
(4) Lift Cylinder
(5) Gear Pump (charge oil)
(6) Gear Pump (work tool)
(7) Control Valve (work tool)
(8) Manual lowering valve for the lift arms
(9) Valve (ride control) (optional)
(10) Valve (implement pilot ON/OFF solenoid)
(11) Hydraulic accumulator (pilot)
(12) Relief valve (charge)
(13) Valve (travel pilot ON/OFF solenoid) The piston pump for the hydrostatic system is mounted to the engine. The piston pump (6) for the work tools is mounted to the piston pump for the hydrostatic system. Piston pump (6) supplies the work tool hydraulic system with oil. When the engine speed increases, the speed of piston pump (work tool) (6) increases. The increased speed of the pump will move oil to the work tool hydraulic system. Control valve (work tool) (7) is a restricted flow open center control valve.The pilot oil for the work tool hydraulic system is supplied by the gear pump (charge oil) (5). The gear pump (charge oil) (5) is splined to the drive shaft of the gear pump (work tool) (6). Oil flows out of the gear pump (charge oil) (5) to the fan drive motor. The oil flows through the fan drive motor to the oil filter. From the oil filter, the oil flows to the piston pump for the hydrostatic system. At the piston pump, the hydraulic oil flows past the relief valve (charge) (12) and the valve (travel pilot ON/OFF solenoid) (13). Charge oil exits the hydrostatic piston pump and flows to the valve (implement pilot ON/OFF solenoid) (10). In order for the oil to flow to the control valve (work tool) (7), all three of the electronic interlocks must be disengaged. In order for oil to flow through the valve (implement pilot ON/OFF solenoid) (10), the hydraulic enable solenoid must be energized.When the engine starts rotating, charge oil will supply the accumulator (11). The charge pump directs oil flow to the valve (implement pilot ON/OFF solenoid) (10). The oil flows downstream across a one-way flow check valve. The oil will flow directly to the accumulator (11). Oil will flow to the accumulator (11) with no electrical components energized. The charge oil will also flow to the valve (implement pilot ON/OFF solenoid) (10). When the valve (implement pilot ON/OFF solenoid) (10) is activated, oil will be directed to the control valve (work tool) (7). The electrohydraulic control lever for the hydraulic work tool must be activated to a desired position in order to activate the solenoid valve. Once the solenoid valve is activated the charge oil shifts the control spool to the desired position. Once any control spools shift, the high-pressure oil from the piston pump (work tool) (6) will flow to the selected circuit. Relief valve (charge) (12) maintains the pressure for the charge oil.Hydraulic System for the Lift Cylinders
When the control lever for the work tool is moved to the RAISE position, the RAISE solenoid on the control valve (work tool) (7) is activated. The solenoid