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| Illustration 1 | g00987137 |
Hydraulic Tank (1) Front brake oil cooler relief valve (2) Rear brake oil cooler relief valve (3) Front brake cooling pump section (4) Rear brake cooling pump sections | |
The brake cooling pump sections are located inside the hydraulic tank. The brake cooling pump sections are driven by the piston motor for the brake cooling.
The piston pump that drives the piston motor is controlled by the Brake/Cooling ECM. The Brake/Cooling ECM analyzes three factors that pertain to the speed of the brake cooling pump sections. Refer to Systems Operation, "Machine Electronic Control Module (Brake/Cooling)" for additional information about the control logic.
Front brake cooling pump section (3) sends oil through a screen into the front brake oil cooler. Rear brake cooling pump sections (4) send the oil through the screens into the rear brake oil cooler. The oil from the brake cooling pump sections is combined with the oil from the gear pump for the hoist and for brake cooling. The oil flows to the disc brakes. After the oil cools the brakes, the oil returns to the hydraulic tank.
Both of the outlet lines to the oil coolers have a relief valve in the line. The oil cooler relief valves are located in the hydraulic tank. If the pressure in the outlet line increases to the relief pressure, the relief valve will open and oil will flow into the hydraulic tank.