TUBE AS 3056917 - Caterpillar

Illustration 1 g00637433
Torque Converter Components (1) Rotating housing (2) Flange assembly (3) Impeller (4) Gear (5) Inlet port (6) Carrier (7) Turbine (8) Cover assembly (9) Carrier assembly (10) Hub (11) Output shaft (12) Stator (13) Hub (14) Outlet portThe torque converter is located at the input end of the transmission. The torque converter housing is bolted to the flywheel housing. Output torque from the torque converter enters the planetary transmission through either the Number 1 sun gear or the Number 2 sun gear. The gear that receives the output is dependent upon the direction clutch that is engaged.The hydraulic system for the torque converter contains the inlet ratio valve and the outlet relief valve.Oil for the operation of the torque converter is supplied by the transmission oil pump. The torque converter inlet pressure is controlled by the ratio valve. The ratio valve limits the pressure to the torque converter to a maximum of 965 kPa (140 psi) when the oil is cold. The ratio valve is part of the selector and pressure control valve.The torque converter outlet pressure is 415 kPa (60 psi).Rotating housing (1), flange assembly (2), hub (13), impeller (3), and oil pump drive gear (4) are driven by the flywheel. These components rotate as a unit at the engine speed.The oil from the transmission hydraulic control relief valve enters the torque converter through inlet port (5) in carrier (6). The oil is directed to the inlet port (5) by a passage in the torque converter housing. From inlet port (5), the oil flows through a passage in the hub (13). As impeller (3) rotates, impeller (3) acts as a pump in order to direct oil to turbine (7) .The turbine (7) is bolted to hub (10), which is connected to output shaft (11) by splines. The turbine (7) directs oil to stator (12), which is held stationary. The stator (12) is connected to carrier assembly (9) by splines. Carrier assembly (9) is connected to carrier (6) by splines. Carrier (6) is bolted to the torque converter cover.Oil is directed from the torque converter through a passage in hub (13). From the passage in hub (13), the oil flows through a passage in carrier assembly (6) to outlet port (14). From outlet port (14), oil is directed to the torque converter outlet relief valve. All the oil from the outlet relief valve flows to the oil cooler. The temperature of the oil is lowered in the torque converter oil cooler. From the torque converter oil cooler, the oil flows to the transmission. The oil cools the internal components of the transmission. The oil lubricates the internal components of the transmission.Converter Ratio Valve
Illustration 2 g00637604
(1) Transmission selector and pressure control valve (2) Ratio valve (3) Spring (4) SlugRatio valve (2) controls the maximum pressure to the torque converter. Ratio valve (2) prevents damage to the torque converter components when the engine is started and the oil is cold. Ratio valve (2) limits the maximum pressure to the torque