Electric Feed Pump
The electric feed pump is built into the coupling unit. The pump is supplied with power by the differential electronic module. When the engine is started and exceeds 400 rpm the differential electronic module supplies the feed pump with power.
The feed pump pumps fluid to the annular pistons. This pushes the rollers for the pistons into contact with the cam disc. At the same time hydraulic fluid flows to the operating piston. This eliminates play in the multi-plate clutch pack. The coupling is now able to react and regulate torque distribution rapidly.
All wheel drive is disengaged if there is a fault in the feed pump.