Manual five-speed transmission Chevrolet Lacetti: 1 - bracket for the rear support of the power unit; 2 - gearbox control drive; 3 - clutch housing; 4 - breather (filler plug); 5 - reverse light switch; 6 - back cover; 7 - lock for adjusting the gearbox control drive; 8 — a cover of the mechanism of a gear change; 9 — a rod of the mechanism of a gear change; 10 - speed sensor drive (not visible in the photo); 11 - bottom cover; 12 — an epiploon of a drive of a forward wheel; 13 - intermediate crankcase; 14 - input shaft; 15 - plug of the oil level control hole.
Elements of the gear shift control mechanism: 1 - control rod; 2 - gearshift lever; 3 - thrust guide sleeve; 4 - damper; 5 - mechanism case; 6 - backstage; 7 - bearing buffer; 8 - backstage bearing; 9 - bearing support; 10 - axis of the lever; 11 — a washer of a support of the lever
Elements of the gear shift mechanism drive: 1 - bearing; 2 - input shaft; 3 - rocker; 4 - thrust; 5 - bearing damper; 6 - sealing ring; 7 - bearing sleeve; 8 - axis of the rocker; 9 - output shaft
The mechanical gearbox is two-shaft, with five forward and one reverse gears, with synchronizers in all forward gears. The gearbox is structurally integrated with the differential and final drive.
The gearbox housing consists of three parts cast from aluminum alloy: the crankcase combined with the clutch housing, the intermediate crankcase and the rear cover.
The input shaft has a collapsible design, a block of drive gears of 1-4 gears is installed on it on splines, as well as a drive gear of 5 gears. All drive gears are in constant mesh with the corresponding driven gears in the forward gears. Gears are cylindrical, helical, with the exception of spur reverse gears.
Output shaft hollow (for supplying oil to the bearings of the driven gears). It contains the driven gears, forward gear synchronizers and the final drive gear, made integral with the shaft. Each driven gear has an additional spur ring to which the sliding synchronizer clutch is connected when the gear is engaged. Front shaft bearings? roller, rear ball. Roller bearings perceive large radial loads, ball bearings perceive both radial and axial loads that occur in the engagement of a pair of helical gears. The shafts are kept from axial movement by ball bearings installed in the intermediate housing.
The differential is conical, two-satellite. The bearing preload is adjusted by turning the bearing adjusting nut (from the left drive). The main gear driven gear is bolted to the flange of the differential box. The differential box has two satellites and two side gears.
The satellites are mounted on an axle fixed in the differential box. Semi-axial gear-shafts of the internal hinges of the wheel drives, which are fixed in the gears with split spring rings.
Oil seals pressed into the sockets of the clutch housing work on the cylindrical surfaces of the shanks.
To prevent water ingress and reduce dust ingress into the gearbox cavity, its breather is installed in the upper part of the gear shift housing. Oil can be filled into the gearbox by unscrewing the breather.
The gear lever is mounted on the floor tunnel in the plastic housing of the control mechanism and is connected to the control rod.
The other end of the control rod through the drive is connected to the gear shift mechanism located in the gearbox.
The gearbox is factory-filled with gear oil designed to last the life of the vehicle.
The oil level in the gearbox should be at the level of the lower edge of the control hole.
Location of the oil level plug in the gearbox (for clarity, the right wheel drive is removed)
There is no drain hole in the gearbox, so if you need to drain the oil from the gearbox, you will need to remove the bottom cover.
Operations for replacing the oil seal of the input shaft of the gearbox, see. Removing the assembly of the working cylinder of the hydraulic drive and the clutch release bearing.