Oil supply for 4MATIC transfer case function - GF28.55-P-3010AV

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2016 Mercedes-Benz E63 S AMG, 2016 Mercedes-Benz E400, 2016 Mercedes-Benz E350, 2016 Mercedes-Benz E300, and 2016 Mercedes-Benz E250. However, it is still accessible from the selected car via links, so may be relevant.

MODEL 204.0 with TRANSMISSION 722.960/962/963/964/965 as of model year 2009

MODEL 204.2 with TRANSMISSION 722.962/965 as of model year 2009

MODEL 204.9 with TRANSMISSION 722.960/962/964/965

MODEL 212 with TRANSMISSION 722.960/961/962/971

MODEL 216 with TRANSMISSION 722.961 as of model year 2009

MODEL 221 with TRANSMISSION 722.960/961/962 as of model year 2009

Oil change on immobilized vehicle

Fig 1: Transmission Oil Flow Diagram - Immobilized Vehicle

Courtesy of MERCEDES-BENZ USA

Oil change in driving mode

Fig 2: Transmission Oil Flow Diagram - Driving Mode

Courtesy of MERCEDES-BENZ USA

Function requirements for 4MATIC transfer case oil supply, general

Engine running

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

Fig 3: Oil Return Line From Transmission Cooler, Fine-Mesh Filter And Throttle

Courtesy of MERCEDES-BENZ USA