DRIVE GP- 2821533 - Caterpillar

Illustration 1 g00504228
Location of Torque ConverterThe operator's cab has been removed for clarity.The torque converter connects the engine to the transmission. This connection between the engine and the transmission is a hydraulic connection. No direct mechanical connection exists between the engine and the transmission.The torque converter uses oil to send torque from the engine to the transmission. When the machine is working against a load, the torque converter can multiply the torque from the engine. The torque converter then sends a higher torque to the transmission.
Illustration 2 g00503951
515 Torque Converter (1) Housing. (2) Turbine. (3) Stator. (4) Impeller. (5) Pump drive gear. (6) Carrier. (7) Outlet passage. (8) Inlet passage. (9) Hub.
Illustration 3 g00503952
525 Torque Converter (1) Housing. (2) Turbine. (3) Stator. (4) Impeller. (5) Pump drive gear. (6) Carrier. (7) Inlet passage. (8) Outlet passage. (9) Hub.The oil for the operation of the torque converter comes from the oil pump for the transmission. The oil pump is driven by pump drive gear (5). The oil flows to a flow control valve in the transmission case. The oil flow is divided at the flow control valve. Oil is directed to the transmission circuit and to the torque converter circuit. The maximum torque converter inlet oil pressure is controlled by the torque converter inlet relief valve. The converter inlet relief valve is mounted in the transmission case below the transmission control valve. The relief valve limits the maximum pressure to the torque converter to 900 70 kPa (130 10 psi). The torque converter inlet relief valve protects the torque converter from high pressure that is due to cold oil or due to some other restriction in the torque converter or in the cooler circuit.Housing (1) is connected to the engine flywheel with splines. Impeller (4) and gear (5) for the oil pump are connected to the rotating housing. These components turn with the engine flywheel at the engine speed.Stator (3) is connected to carrier (6). The carrier is fastened to the transmission cover. The stator does not turn.Turbine (2) is connected to hub (9) by splines. Hub (9) is connected to the transmission input shaft by splines.Oil from the hydraulic controls of the transmission flows into the torque converter through inlet passage (7) in carrier (6). This oil flows to impeller (4). The rotation of the impeller provides the oil with force.Impeller (4) turns with the rotating housing (1) at the engine speed. The rotation of the impeller causes the oil to move to the outside of the impeller. The oil then goes around the inside of housing (1) and against the blades of turbine (2). The force of the oil that hits the turbine blades causes turbine (2) and hub (9) to turn. This sends torque to the input shaft of the transmission. Now, the turbine torque that is provided by the force of the oil from the impeller cannot be more than the torque output of the engine to the impeller.After the oil hits the turbine blades, the