INVERTER AR 5174490 - Caterpillar

View Of Right Side Machine
(5) Hydraulic oil tank.Hydraulic oil tank (5) is located behind the operators platform. A strainer is located in the hydraulic oil tank. The hydraulic oil passes through the strainer and out to the steering, propulsion, and vibration systems.
View Of Area Under Operator Platform
(3) Steering pump.Steering pump (3) pulls oil from hydraulic tank (5). The steering pump is driven off of the back of the tandem propulsion pumps. The propulsion pumps are driven by the pump drive group on the rear of the engine. The steering pump is located under the operators platform.
View Of Area Under Console
(2) Steering control unit. (13) Console.The oil flows from steering pump (3) to steering control unit (2). The steering control unit is located at the bottom of the steering column just under console (13). The steering control unit is closed center and load sensing.
View Of Area Under Operator Platform
(1) Steering cylinder.When the steering wheel is turned, two double acting steering cylinders (1), receive oil from steering control unit (2) so that the compactor can make the desired turn. When the steering wheel is not being turned, oil goes through the steering pump to maintain pressure at the steering control unit. There is a small amount of oil required to make up for losses through the bleed orifice in the steering pump. With the steering control unit in the spring centered position, no oil is ported to the steer cylinders.
View Of Left Side Machine
(8) Hydraulic Oil Filter.If hydraulic oil filter (8) becomes plugged, a pressure drop is created across the hydraulic oil filter. When the pressure drop reaches 350 kPa (50 psi), the filter bypass valve opens and oil flows through the filter bypass valve to spring loaded check valve (11), which is part of the parking brake and speed shift valve. When the pressure reaches 1220 kPa (175 psi) in the passage between the bypass and check valves, the spring loaded check valve opens and the oil flows to the hydraulic tank. The spring loaded check valve prevents the brake pressure from ever dropping below 1550 kPa (225 psi). A pressure drop of 172 kPa (25 psi) shows red on the visual bypass indicator, which means the hydraulic oil filter should be changed.Steering Pump
Cross Section Of Steering Pump
Steering Pump Cross Section
(1) Priority valve spool. (2) Pilot load sensing signal port. (3) Bleed orifice. (4) Charge outlet port. (5) Unloading relief valve. (6) Steering pump gears.The steering pump is a fixed displacement gear pump driven off of the back of the tandem propulsion pumps. The steering pump supplies oil to the steering, propel and vibratory systems. Within the pump is priority valve (1) which is a pressure compensated flow divider. The priority valve divides the flow between the steering circuit and the change circuit. The steering circuit has priority, and the return flow from the steering circuit goes back into the charge circuit.Unloading relief valve (5) in the steering circuit, empties into the inlet of the steering pump. The unloading