Hydraulic actuators lock or release individual elements of the planetary gear, thus changing the gear ratio of the transmission. The locking is performed by a brake mechanism and multi-disc friction clutches operating in oil.
The oil pump supplies oil through a hydraulic distributor, which has valves to supply oil under pressure to the required brake mechanisms and friction clutches. The hydraulic distributor provides oil pressure regulation taking into account the engine load.
The oil pump is driven by the engine crankshaft through the torque converter, and supplies oil under pressure to the torque converter to lubricate the transmission components, as well as to operate the friction clutches and brakes.
Solenoid valves are designed to open or block the oil channels of the hydraulic distributor, which leads to gear shifting.
The electronic unit receives signals from sensors monitoring vehicle speed, accelerator pedal position, engine speed and selector position, and controls the electromagnetic valves.
The automatic transmission identification plate is located on the left side of the crankcase above the transmission mode selector switch.
Identification plate: 1 - model code; 2 - production number; 3 - registration serial number; 4 - gradation code.
Sectional view of the 4L30E automatic transmission: 1 - torque converter; 2 - freewheel clutch; 3 - fourth gear clutch; 4 - freewheel clutch; 5 - overdrive; 6 - reverse gear clutch; 7 - second gear clutch; 8 - third gear clutch; 9 - freewheel clutch; 10 - planetary gear; 11 - band brake.
Automatic transmission oil pump 4L3OE: 1 - oil pump drive gear; 2 - driven gear of the oil pump; 3 - cylindrical pin; 4 - bushing; 5 - safety valve; 6 - pressure regulating valve spring plate; 7 - pressure regulating valve spring; 8 - pressure regulating valve; 9 - oil pump assembly; 10 - torque converter clutch control valve; 11 - torque converter clutch control valve spring; 12 - Torque converter clutch control valve plug; 13 - pin; 14 - piston; 15 - spring; 16 - spring plate; 17 - retaining ring.
Text copied from this portal OpelBook
Valve Block Adapter: 1 - screw; 2 - retainer; 3 - electromagnetic valve of pressure regulator; 4 - valve block adapter housing; 5 - battery plug 3rd/4th gear; 6 - spring cylindrical pin; 7 - accumulator valve 3rd/4th gear; 8 - 3rd/4th gear accumulator control valve; 9 - safety valve spring; 10 - retaining ring; 11 - safety valve; 12 - "ground" wire; 13 - washer; 14 - screw; 15 - electromagnetic valve of the torque converter clutch; 16 - screen; 17 - Screen plug; 18 - sealing ring.
Parking lock mechanism and transmission mode switch 4L30E: 1 - nut; 2 - Parking lock rod; 3 - latch; 4 - spring; 5 - switching segment; 6 - gear selector lever rod; 7 - sealing ring; 8 - gearbox operating mode switch; 9 - bolt; 10 - lid; 11 - pin; 12 - control rod.
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