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| Illustration 1 | g02315093 |
(1) Brake Oil Coolers | |
Brake oil coolers (1) are located near the engine. One brake oil cooler is located on the right side of the engine. The other brake oil cooler is located under the front of the engine next to the Pump and Motor (Parking Brake Release, Secondary Steering). Engine coolant from the water pump flows around brake oil coolers (1) . Then, the engine coolant flows back to the cylinder block. The engine coolant transfers the heat from the brake oil system to the engine coolant.
The front and rear brakes are cooled by oil. When the hoist control valve is in the HOLD, FLOAT, or SNUB position, oil from the brake cooling section of the Gear Pump (Brake, Brake Cooling, Hoist) flows through brake oil coolers (1) . Oil from the Gear Pump (Brake Cooling) joins the oil from the brake cooling section of the Gear Pump (Brake, Brake Cooling, Hoist) and flows to brake oil coolers (1) . The Gear Pump (Brake Cooling) is located next to the Gear Pump (Power Train). The oil then circulates around the rear brakes and around the wet front brakes. The oil then returns to the hydraulic tank through the return screen.
The oil cooler relief valve is located in the Control Valve (Hoist). The oil cooler relief valve limits the brake oil cooling pressure when the Control Valve (Hoist) is in the HOLD, FLOAT, or SNUB position. In most cases, the oil cooler relief valve is needed only when the brake cooling oil is cold. When the brake cooling oil is at operating temperature, the brake cooling oil pressure is much lower than the oil cooling relief valve setting.