ELBOW 0307969 - Caterpillar

The hydraulic oil flows from the hydraulic tank to the charge pump (29). The charge oil (CC) flows through the hydraulic oil filter (18) to the speed sensing valve (17) .Most of the charge oil to the speed sensing valve enters the charge circuit. The oil then flows to the crossover relief valves (16) and (35) .The makeup valves in each crossover relief valve open. The charge oil flows through the drive loop to the following components: gear pump (28), piston motor (8), flushing valve (38), reverse solenoid valve (9) and motor displacement control (39). When the charge system is full of charge oil, the pressure increases and the charge relief valve (13) opens. Most of the charge oil flows to the pump case. The oil then goes back to the tank. The oil that flows through the speed sensing valve (17) provides signal pressure (DD) to