GF28.55-P-3010AV Oil Supply For 4MATIC Transfer Case Function

GF28.55-P-3010AV Oil supply for 4MATIC transfer case function
- Transmission 722.960/962/963/964/965 [model 204.0]
- Transmission 722.962/965 [model 204.2]
- Transmission 722.960/962/964/965 [model 204.9]
- Transmission 722.960/961/962 [model 212]
- Transmission 722.961 [model 216]
- Transmission 722.960/961/962 [model 221]

Component Identification:

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.

Oil supply for 4MATIC transfer case, function sequence
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 is limited here by a restrictor (1b) in the oil return line connector (1) to approx. 100 ml/min.

An oil sump is formed in the final drive chamber (3) 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 (3), through the rotation of the helically geared spur gears, and up into the pressure governing chamber (6) of the transfer case.

The oil is accumulated here and routed over the through-bore (4) on the floor of the pressure governing chamber (6) and back into the final drive chamber (3).

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 (6) rises above the max. level of 700 ml, the oil flows through an oil return hole (7) 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.