HOOK 5320741 - Caterpillar

Hydraulic Control
Illustration 1 g00295802
Components of the hydraulic control (1) Double switch (attachment tool). (2) Double switch (attachment tool). (3) Fourth pedal (option). (4) Right implement control lever. (5) Left implement control lever.The combined function hydraulic system consists of the single action hydraulic attachment circuit and the double action hydraulic attachment circuit. For more information, refer to System Operation, "One-Way Hydraulic Flow Operation". For more information on the double action hydraulic attachment circuit, refer to Systems Operation, "Two-Way Hydraulic Flow Operation". Operation is selected through use of a ball valve assembly.Ball Valve Assembly
Illustration 2 g00296631
(6) Ball valve. (7) Relief valve. (8) Main control valve. (A) Open position. (B) Closed position.Ball valve (6) is the component that dictates the hydraulic circuit. The hydraulic circuit is the single action hydraulic attachment circuit or the double action hydraulic attachment circuit.When ball valve (6) is open, the hydraulic circuit is set up for one-way flow. When the hydraulic circuit is set up for one-way flow, the oil pressure for the attachment is controlled by relief valve (7) .
Illustration 3 g00296632
(6) Ball valve. (9) Relief Valve. (10) Relief valve.When ball valve (6) is closed, the hydraulic circuit is set up for two-way flow. When the hydraulic circuit is set up for two-way flow, the oil pressure for the attachment is controlled by relief valve (9) and relief valve (10) .