Mercedes-Benz Manual Transmission 26.04 General Information General Information Slave cylinder; The Mercedes-Benz transmission (MBT) is offered in two 6-speed models: Hydraulic lines connecting the various parts of the system. The MBT transmission removal and installation pro- cedures have been moved to Subject 100 from their previous location in Section 26.00 . MBT520S-6D, direct drive, 520 lb·ft torque rat- ing MBT660S-6O, overdrive, 660 lb·ft torque rating The teardown procedures included in this section also apply to the AGS automated transmission, with slight changes which are indicated at appropriate places in the procedures.
If it is necessary to tear down the AGS transmission, be sure to remove the AGS assembly before proceeding. See Sec- tion 26.03, Subject 200 for procedures. The gear case holds 9.5 quarts (9.0 liters) of oil. Mo- bilTrans SHC ® DC is the approved oil. Both models are fully synchronized for reduced shift- ing effort. Equipped with six forward speeds and one reverse speed, both models show a particularly large overall ratio between low and top gear. See Specifi- cations, 400 for gear ratios for each model. On all transmissions, disassembly of the transmis- sion main shaft is not recommended except when it is necessary to check for synchronizer wear.
Disas- sembly of the countershaft is not recommended in any case. To reduce fluid change intervals and to increase bearing life, MBT transmissions are designed with "clean" bearings. These bearings have covers on both sides. They cannot be damaged by the wear particles that accumulate in the fluid. The geometry of the gear teeth has been optimized to provide low- noise operation and extended gear life. It is important to check main shaft end play if either gear case half, the main shaft bearings, or the input shaft is replaced. For detailed procedures, see Sub- ject 250 . The bell housing has been designed around standard SAE bolt patterns.
SAE2 is standard on both MBT660S-6O and MBT520S-6D models. To prevent premature tool wear, use extreme pres- sure lubricant such as Kent-Moore J 23444-A or equivalent on tool threads and at all friction and con- tact points. Other features of the MBT transmissions include: Light metal gear cases with integrated bell housings; Low installation height (the shift interface is positioned laterally); Double synchronization from 1st gear to 4th gear; Electronic vehicle speed sensor; Longer oil change intervals; Each model requires a hydraulic clutch system. No clutches with manual control can be installed for use on MBT transmissions.
With the hydraulic system installed, the clutch linkage is self-adjusting. Full range of PTO units available. The hydraulic clutch system consists of the following parts: Hydraulic fluid reservoir; Clutch pedal unit; Master cylinder; Business Class M2 Workshop Manual, Supplement 10, September 2006 050/1