Atc 300 Transfer Case - BMW E61 Sports Wagon 530xiT Owner's Manual

ATC 300 Transfer Case

The transfer case ATC 300 (Active Torque Control) is used on the E60/E61.
In view of the restricted package space of the transmission tunnel in the BMW 5 Series, it
was not possible to adopt the transfer case from the BMW X3 (ACT400) with the same
torque rating.
On the BMW 5 Series it was not possible to drive the forward power flow diagonally as is
the case on the X3 with a chain, but rather it is necessary to divert it L-shaped with the
aid of spur gears (pinions), resulting in a modified design of the transfer case.
The actuator drive and the actuation of the control lever were also modified. The clutch
package remains unchanged. The forward connection is provided by a bolted on drive
shaft.
The flange of the ATC transfer case is the same for automatic and manual transmissions.
ATC 300 Transfer Case
Index
1
Propeller shaft to front axle
2
Drive flange to front axle
3
4
5
6
7
14
E61 Sports Wagon
Explanation
Control cam
Transfer case
Idler gear
Drive gear
Control lever
Index Explanation
8
Clutch housing
9
Output flange to rear axle
10
Propeller shaft to rear axle
11
12
13
14
Disc package
Actuator drive
Drive pinion
Output gear