... , MB15, MB22, MB40, MB55, MB75 MB speed variator lubricating and replacement:1, MB transmission gearbox, please choose (Ub - 1) or (Ub ... of work in 500 hours after the replacement,Second job 1000 hours after the replacement once, after every 2000 changed during once ... , in work bad circumstances should shorten replacement period.2, MB transmission gearbox and the X3 type once ...