Oil supply for 4MATIC transfer case function - GF28.55-P-3010AVE
MODEL 207 with TRANSMISSION 722.9 with CODE M005 (4MATIC)
Oil change on immobilized vehicle
Oil change in driving mode
Function requirements for 4MATIC transfer case oil supply, general
- Internal combustion engine running
- Drivetrain operational
Oil supply for 4MATIC transfer case, general
The oil supply system ensures that the transfer case components are supplied with sufficient oil.
The integrated design means that the distributor and automatic transmission have a common oil system.
Function sequence for 4MATIC transfer case oil supply
A separate oil feed on the automatic transmission housing enables oil to flow from the oil return on the transmission cooler to the transfer case. The oil feed here is limited by means of a restrictor in the oil line's connector to approx. 100 ml/min.
An oil sump is formed in the final drive chamber and its oil level is regulated to a constant max. 700 ml.
If the oil level on a vehicle at standstill rises to more than 700 ml, the oil flows off through the central tapered roller bearing in the automatic transmission.
When in automotive operation the oil is hurled out of the final drive chamber, through the rotation of the helically geared spur gears, and up into the transfer case's pressure governing chamber.
The oil is accumulated here and routed over the through-bore on the floor of the pressure governing chamber and back into the final drive chamber.
This principle ensures that the oil sump is kept as small as possible when in automotive operation, to prevent any high swirling of the oil.
If the oil level in the pressure governing chamber rises above the max. level of 700 ml, the oil flows through an oil return hole into the automatic transmission.
The oil supply for the planetary gear differential is provided through two holes between the final drive chamber and the planetary gear set chamber.
Oil feed
| Overview of system components, automatically controlled all-wheel drive (4MATIC) | GF28.00-P-9998AVE |