SHIELD 2248525 - Caterpillar

Return Manifold System
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Hydraulic Schematic Single Speed (1) Control Valve (work tool) (2) Hydraulic oil cooler (3) Gear Motor (fan drive) (4) Gear Motor (air conditioner) (5) Hydraulic Tank Group (6) Hydraulic oil filter (7) Solenoid Valve and Mounting Group (quick coupler) (8) Return Manifold (9) Gear Pump (charge oil, implement, air conditioner and fan drive) (10) Piston Motor Group (hydrostatic right side) (11) Piston Pump (hydrostatic system) (12) Pilot Valve (work tool) (13) Solenoid Valve and Mounting Group (parking brake) (14) Pilot Valve (hydrostatic system) (15) Piston Motor Group (hydrostatic left side)Oil flows to the Return Manifold Group (8) from the following components: the Pilot Valve (work tool) (12), the Pilot Valve (hydrostatic system) (14), Solenoid Valve and Mounting Group (parking brake) (13), Solenoid Valve and Mounting Group (quick coupler) (7), the Piston Pump (hydrostatic system) (10) and the Piston Motor Groups (hydrostatic system) (10) and (15) .The return manifold provides a common junction for the hydraulic oil prior to returning to the hydraulic tank. The return manifold also routes the oil to the hydraulic oil cooler (2) in order to keep the oil from getting too hot.
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(8) Return Manifold Group (16) Return oil from the Solenoid Valve and Mounting Group (quick coupler) (17) Return oil from the Pilot Valve (hydrostatic system) (18) Return oil to the hydraulic oil cooler (19) Return oil from the case of the Piston Pump (hydrostatic system) (20) Bypass check valve of the oil cooler (21) Hydraulic system drain valve (22) Return oil from the Piston Motor Group (hydrostatic left side) (23) Return oil from the Piston Motor Group (hydrostatic right side) (24) Return oil to the hydraulic tank (25) Return oil from the hydraulic oil coolerThe hydraulic oil flows to the Gear Motor (fan drive) (3) which causes the cooling fan to rotate. The cooling fan blows air across the oil cooler. The air cools the hydraulic oil. The cooling system is designed to maintain the hydraulic oil temperature at a temperature of approximately 50° 10°C (120° 20°F). The hydraulic oil then flows through hydraulic oil filter (6) and into the Return Manifold Group (8) .The bypass check valve of the oil cooler (20) is located in the Return Manifold Group. The bypass check valve prevents hydraulic oil from flowing to the hydraulic oil cooler when the machine is first started, or when the oil temperature is less than the minimum specification for the oil temperature. The bypass check valve opens when the oil pressure inside the cooler exceeds 172 kPa (25 psi). The hydraulic oil flows from the Return Manifold Group and returns to the hydraulic tank (5) .The hydraulic system drain valve (21) is mounted in the Return Manifold Group. The drain valve is used to drain approximately 90% of the hydraulic oil from the lines, valves and the tank. A hose connects to the valve. The hose allows the