Hydraulic System - 2.0L: Overview Kia Optima III

Description

The hydraulic system consists of oil, an oil filter, an oil pump, and a valve body (valves and solenoid valves). The oil pump is powered by the engine. ATF passes through the oil filter and gets distributed along the oil channels. The oil becomes highly pressurized as it exits the oil pump and passes through the line pressure valve before being fed to the clutch & brake control valve, clutch, and brakes. TCM controls the hydraulic pressure using solenoid valves and controls clutch and brake operations.

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The oil pump is built-in as a single unit with the 26 brake chamber. Rotation of the pump builds the hydraulic pressure needed for the lubrication of the various parts of the transaxle and operation of the clutch and brakes. The oil also circulates through the torque converter and the cooler.

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The valve body is essential to automatic transaxle control and consists of various valves used to control the oil feed from the oil pump. Specifically, these valves consist of pressure regulator valves, oil redirection valves, shift valves, and manual valves. The body also features electronic solenoid valves that ensure smooth gear changes.

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1. Remove the battery and the battery tray. Refer to «BATTERY»(ref-429541-S17247731372011101500000) .
2. Remove the under cover (A). Tightening torque: 7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)
3. Replace new gasket and the plug after draining the automatic transaxle fluid by removing the drain plug. Refer to «HYDRAULIC SYSTEM (FLUID)»(ref-429560-S16638232802011101500000) .
4. Remove the valve body cover (B) and eyebolt (A). Tightening torque: (A) 34.3 ~ 44.1 N.m (3.5 ~ 4.5 kgf.m, 25.3 ~ 32.6 lb-ft) (B) 13.8 ~ 14.7 N.m (1.3 ~ 1.5 kgf.m, 9.4 ~ 10.8 lb-ft) CAUTION: Always replace the gasket of the eyebolt use new one whenever loosening eyebolt.
5. Remove the plate and the detent spring (A) after removing the bolt. Tightening torque: 24.5 ~ 35.3 N.m (2.5 ~ 3.6 kgf.m, 18.1 ~ 26.0 lb-ft)
6. Remove the bolt (3 ea) after disconnecting the solenoid valve (A) connector and the oil temperature sensor connector (B). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
7. Remove the valve body assembly (A). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)