After changing the gearbox oil and filter, my car is not engaging any gears

If you are experiencing issues with the gearbox on your Scania R420 where gear 1 and 3 are working normally, but gear 2 and 4 are not engaging properly, it is likely that there is a problem with the gearbox itself. Here are a few potential causes for the issue and steps you can try to troubleshoot:

1. Synchronizer ring: The synchronizer ring is responsible for coordinating the speed of the gear with the speed of the engine. If the synchronizer ring is worn or damaged, it may prevent gear 2 and 4 from engaging properly.
2. Clutch: The clutch is responsible for connecting and disconnecting the engine from the gearbox. If the clutch is worn or damaged, it may prevent gear 2 and 4 from engaging properly.
3. Linkage: The linkage is responsible for connecting the gear lever to the gearbox. If the linkage is worn or damaged, it may prevent gear 2 and 4 from engaging properly.
4. Control module: The control module is responsible for controlling the gearbox. If the control module is malfunctioning, it may prevent gear 2 and 4 from engaging properly.
5. Check the oil level and condition: Make sure that the oil level and condition are correct. Low oil level or dirty oil can cause damage to the gearbox and prevent gear 2 and 4 from

'Transmission Fluid' in a manual transmission vehicle is called 'gearbox oil'. On the gearbox, there is a drain plug in the bottom somewhere and a fill plug on the side. You drain, clean the drain plug, replace the copper washer and put the drain plug back in. Fill the gearbox with oil until the oil starts to weep out of the filling hole. Replace the fill plug.

Google

year make model change gearbox oil

Please include 'year make model' in all questions in this category. Thanks.

Manual gearboxes usually require a gearbox oil change every 30,000 to 50,000 mi (48,000 to 80,000 km). Automatic gearboxes usually have gear oil change intervals of between 60,000 to 100,000 mi (96,000 to 160,000 km). It's advisable that you change your gearbox oil filter at the same time as your oil.
Aug 23, 2019

When and how to check and change your gear oil and filter

..

if the automatic service was recent take it back and ask why
they should have given you a receipt to what was done

is the engine check light on

on a 95 micra
could be
a faulty solenoid
TPS fault
solenoids
the transmission control module
transmission fluid level low when hot

I am sorry to tell that the gearbox need to have some major repair. It is also not advisable to continue driving as the gearbox can breakdown completely leaving you stranded. At least one the cluster drive gears in the gearbox is damaged (gear tooth stripped off) that will result in that only some of the gears being able to be selected. The broken off tooth are still in the gearbox and due to the oil movement in the gearbox it can be "washed up " in between to engaged gears destroying those as well. This will happen up to the point where there are no gear selection at all.

While just change ATF oil or CVT oil in transmission & old filter too. your car problem will be solve....

Hi Louie, When the ATF smells burned it usually indicates a problem inside the gearbox. Let's hope not though. Drain the ATF oil and then drop the gearbox oil pan. Remove and replace the oil filter and the pan gasket and then refit it. Fill the box with the required amount of transmission fluid. Once filled, make sure the park brake is fully engaged and then check the ATF level with the engine running and the shift in neutral selected. It should be at the top of the lower marks on the transmission dip stick. If the problem persists, the gearbox needs major work or replacement. Regards John

re/check your oil level as it possibly lower then you thought ,as an auto gearbox needs the level to be full, dont rev the gearbox trying to get it to move this will damage the bands inside the gear box,

sounds like a new clutch is needed,pressure plate weak ,oil on clutch causing it to stick,thrust bearing collapsing as its plastic ,spigot shaft rusty causing clutch plate to stick ,evan more causes but i could write all night ,check oil in gearbox

its can be both modulator valve or signs of a transmission going bad.