Daewoo Leganza Gearbox
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The Different types of Gearboxes for the Daewoo Leganza
It had an optional 4 speed hydraulically operated transmission that was said to be rough operating, tended to hunt between gears, and do unnecessary downshifts to second gear. The suspension was too soft, and handling was floaty and unsure. In 1999 Daewoo successfully answered its criticisms. The rough operating hydraulic auto was replaced by an electronically controlled automatic transmission, which stopped the hunting between gears and random downshifts to second gear.
Hydraulically Operated Gearbox in a Leganza
A hydraulic or hydrostatic drive system or hydraulic power gearbox is a drive or transmission system that uses hydraulic fluid under pressure to drive machinery. The term hydrostatic refers to the transfer of energy from flow and pressure, not from the kinetic energy of the flow.
Such a system basically consists of three parts. The generator (e.g. a hydraulic pump, driven by an electric motor, a combustion engine or a windmill); valves, filters, piping etc. (to guide and control the system); the motor (e.g. a hydraulic motor or hydraulic cylinder) to drive the machinery.
How Automatic Transmissions Work in a Leganza
By definition, an overdrive has a faster output speed than input speed. It’s a speed increase — the opposite of a reduction. In this transmission, engaging the overdrive accomplishes two things at once. If you read How Torque Converters Work, you learned about lockup torque converters. In order to improve efficiency, some cars have a mechanism that locks up the torque converter so that the output of the engine goes straight to the transmission.
In this transmission, when overdrive is engaged, a shaft that is attached to the housing of the torque converter (which is bolted to the flywheel of the engine) is connected by clutch to the planet carrier. The small sun gear freewheels, and the larger sun gear is held by the overdrive band. Nothing is connected to the turbine; the only input comes from the converter housing. Let’s go back to our chart again, this time with the planet carrier for input, the sun gear fixed and the ring gear for output.
Ratio = 1 / (1 + S/R) = 1 / ( 1 + 36/72) = 0.67:1
So the output spins once for every two-thirds of a rotation of the engine. If the engine is turning at 2000 rotations per minute (RPM), the output speed is 3000 RPM. This allows cars to drive at freeway speed while the engine speed stays nice and slow.
Method for cleaning a Leganza transmission
A method of cleaning the transmission system of a vehicle includes the steps of starting an engine of the vehicle and bringing it to normal operating temperature. A predetermined amount of a transmission cleaner is charged into the transmission and the vehicle is driven for a predetermined distance. The gears are changed at preselected times while driving so that all gears of the transmission are used equally. The engine is then shut down and transmission fluid is purged from the transmission fluid pan by submerging a trailing end of a first hose into the transmission fluid. A leading end of the first hose is connected into fluid communication with an inlet of a remote charging tank and an outlet of the remote charging tank is connected through a switch to a source of negative pressure. The switch is set to cause the transmission fluid to flow into a transmission fluid waste tank disposed between the outlet and the source of negative pressure. The trailing end of the first hose is then removed from the transmission fluid pan and a transmission cooling line is disconnected from a preselected port of the radiator. The trailing end of the first hose is placed into fluid communication with the transmission cooling line at the preselected port while maintaining the leading end of the first hose in fluid communication with the inlet of the remote charging tank. Transmission fluid is vacuumed from the transmission cooling line and the transmission cooling line is reattached so that all transmission fluid is removed from the transmission cooling lines and most of the transmission fluid is removed from the torque converter.
Automatic transmission fluid oil for Leganza
To operate the automatic transmission, a car will need Automatic Transmission Fluid (ATF). This stops corrosive damage, provides essential lubrication and is mostly made up of refined petroleum that has gone through a process that results in properties that assist a smoother transmission and increase the life of the system – although the ATF system will need to be kept in tip-top condition with regular services as the car gets older.
It’s fair to say though, hardly anyone ever makes the effort to change the transmission fluid – in fact many drivers wouldn’t even know where to start looking because it’s usually quite well hidden away.
You’ll know that you need to pay attention to the automatic transmission fluid, if you find that the gear changes aren’t happening as smoothly as you might expect. Ideally, you should really aim to check the ATF once a month anyway so that you can spot any potential issues before they become a real and expensive problem to fix.
To check the ATF on your car you should take the following steps:
First of all, make sure that you find out which type of ATF fluid you should be using. This information should be in your owner’s manual – if not contact the manufacturer who should be able to tell you.
Park your car so that it is level on the ground (slanting in either direction could will alter your fluid readings) and leave the gears in either Park or Neutral. This is one of the few procedures that might require an idling engine but it does depend on the car so you need to check your owner’s manual first and find out. If it does require the engine to be running, start the car up and wait for it to warm.
Locate the ATF dipstick – it is often a lot shorter than the dipstick for the engine oil but should look virtually the same. In some cases it will have a label on it, so your job will be made much easier!
Take the dipstick out.
Wipe the dipstick down with a cloth or rag, put it back into the hole it came from, make sure it goes all the way back down to the bottom and pull it out again.
The colour and smell of ATF can also indicate problems. Wipe the fluid onto a white sheet of paper or kitchen towel. It will usually be red, and should be transparent and clean in appearance and free of black bits or flakes. It does become a more reddish-brown with age but should not be dark or black or smell of burning. If the fluid has any of these characteristics, seek professional advice.
Check the top of the dipstick and see if the fluid marking comes up to the ‘full’ line. Also check that you are looking at the warm reading – there should be one for ‘warm’ and one for ‘cold’.
If the fluid does not come up to the ‘full’ line then you will need to add some. Remember that ATF shouldn’t be ‘used’ as such, so if it is low, it’s likely that there is a leak. You will need to get this checked out as soon as possible as if left, it can lead to expensive repairs on the transmission system.
To add the fluid simply use a funnel to pour it into the system (usually the hole will be tiny). You should add it slowly and keep checking the dipstick until it reaches the ‘full’ point. Remember that if you add too much you’ll have a heck of time taking it out again!!
Make sure the dipstick is back in securely when you’ve finished.
What happens next?
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