Automatic Transaxle Hydraulic System: Overview Hyundai Veloster I

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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1. Disconnect the battery negative terminal.
2. Remove the air cleaner assembly. (Refer to " «AIR CLEANER»(/hyundai/veloster/i-2011-2015/remont/blowers-superchargers-turbochargers/#intake-system-exhaust-system-turbo) ")
3. Loosen the drain plug, and drain the engine coolant. Remove the radiator cap to drain with speed.
4. Disconnect the over flow hose (A) from the radiator.
5. Disconnect the radiator upper hose (A) and lower hose (B).
6. Disconnect the ATF cooler hoses. (Refer to «REMOVAL»(/hyundai/veloster/i-2011-2015/remont/automatic-trans/#automatic-transaxle-system) ) .
7. Remove the front bumper. (Refer to " «FRONT BUMPER»(ref-609306-S41736271712014041600000) ")
8. Remove the head lamp. (Refer to " «HEAD LAMPS»(ref-609307-S39565306942014041600000) ")
9. Remove the upper mounting bracket (A).
10. Disconnect the cooling fan controller connector (A).
11. Remove the air guard (A) and then disconnect the A/C condenser (B) from radiator.
12. Disconnect the radiator assembly from vehicle.
13. Remove the cooling fan & reservoir tank (A) from the radiator (B).
14. Installation is reverse order of removal.
15. Fill the radiator with coolant and check for leaks.
16. Put the radiator cap on tightly, then run engine again and check for leaks.

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1. Remove the radiator cap, wet its seal with engine coolant, and then install it on a pressure tester.
2. Apply a pressure of 93.16 ~ 122.58 kPa (0.95 ~ 1.25 kg/cm 2 , 13.51 ~ 17.78 psi).
3. Check for a drop in pressure.
4. If the pressure drops, replace the cap.

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1. Wait until engine is cool, then carefully remove the radiator cap and fill the radiator with engine coolant, then install a pressure tester on it.
2. Apply a pressure of 93 ~ 123 kPa (0.95 ~ 1.25 kgf/cm 2 , 14 ~ 19 psi).
3. Inspect for engine coolant leaks and a drop in pressure.
4. If the pressure drops, check hoses, the radiator and the water pump for leakage. If there is no leakage, inspect the heater core, the cylinder block and the cylinder head.
5. Remove the tester and reinstall the radiator cap. NOTE: Check for engine oil in coolant and/or coolant in engine oil.

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 air duct. (Refer to " «AIR CLEANER»(/hyundai/veloster/i-2011-2015/remont/blowers-superchargers-turbochargers/#intake-system-exhaust-system-turbo) ")
2. Remove the battery and the battery tray. (Refer to " «BATTERY»(ref-609293-S32339350752014041600000) ")
3. Remove the under cover.
4. Drain the coolant. (Refer to " «COOLANT»(ref-609294-S25286250992014041600000) ")
5. Remove the drain plug (A) and reinstall the drain plug after draining ATF totally. Drain plug tightening torque: 38.2 ~ 48.1 N.m (3.9 ~ 4.9 kgf.m, 28.2 ~ 35.4 lb-ft) CAUTION: The gasket of the drain plug use new one.
6. Remove the ATF Injection hole (eyebolt) (A). Eyebolt tightening torque: 2.9 ~ 4.9 N.m (0.3 ~ 0.5 kgf.m, 2.2 ~ 3.6 lb-ft) CAUTION: The O-Ring (A) of the eyebolt use new one.
7. Remove the valve body cover (A). Tightening torque: (A) 13.7 ~ 15.7 N.m (1.4 ~ 1.6 kgf.m, 10.1 ~ 11.6 lb-ft) CAUTION: Use new valve body gasket (A).
8. Remove the bolts (C) after disconnecting the solenoid valve connector (B) and the oil temperature sensor connector (A). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
9. 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)

See also:
• AIR CLEANER
• REMOVAL