While engaging the rear gear on my mercedes axor there is a noise what can cause this noise we have just renew the gear box ???

Question edited for clarity.
Question moved to Mercedes-Benz

Commercial tractor units are a bit out of our league, but there is some help in this link

https://www.google.com/search?q=Mercedes-Benz+Actros+MP2.+What+can+cause+it+to+engage+in+gears+without+depressing+clutch+pedal

..

A grinding noise when you put the motorcycle into gear and it doesn't move could indicate several issues with the final drive on your Suzuki Intruder. Some possible causes are:

1. Worn or damaged clutch: The clutch may not be engaging properly, preventing power from reaching the rear wheel. A worn or damaged clutch can cause a grinding noise when you try to shift into gear.
2. Faulty gear: The gears inside the final drive may be worn or damaged, preventing them from meshing together properly. This can cause a grinding noise when you try to shift into gear.
3. Low or contaminated gear oil: Low or contaminated gear oil can cause excessive wear on the gears inside the final drive, leading to a grinding noise and reduced performance.
4. Failed final drive: A failed final drive can cause a grinding noise and prevent power from reaching the rear wheel.

If you are not familiar with motorcycle repair, it is recommended to take the bike to a qualified mechanic to diagnose and fix the issue.

Question edited to add maker.
Question moved from Motorcycles.

We don't deal with Truck / Lorry Tractor units or 'selfie 0 gears', but ....

https://www.google.com/search?q=axor+2543+gs+clutch+failure+symptoms

..

what does return mean?
what year is it.

Question edited for clarity.
Question moved from Misc to Mercedes.

It appears to be a known issue.

https://www.google.com/search?q=Mercedes+Axor+overheating

..

see the link and scroll down the page
https://www.pdfmanual4trucks.com/mercedes-benz/

air filter may b blocked

Please supply more info it is at the underside off the box.One is on the main box and one at the rear part of the box. it will will not drain all the oil

No defenatly not its just so happend this has gone at the same time cheapest fix is to do a full transmition oil and filter change the mechanics of a mercedes are normally bullet proof cannot say the same about modern electrics there rubbish lol but i would try the filter change first