Transfer Case: Description and Operation

DESCRIPTION





The MS140 is an all-wheel-drive transfer case system that divides power between the front and rear differentials and transmits power to both axles at all times. Its planetary center differential (13) delivers approximately 62 percent of the engine torque to the rear axle and 38 percent to the front.

IDENTIFICATION





The transfer case name can be decoded as follows:
^ M Magna
^ S Steyr
^ 1 Single speed transfer case
^ 4 relative torque capacity
^ 0 Full time with an open differential

The transfer case (1) has a barcode label (3) applied to the right side of the rear transfer case housing to provide important part number and build information.





OPERATION
The transfer case input shaft (1) extends through the hollow shaft (7) to drive the planetary gear system (13) housing. The housing transfers the engine torque to the outer gears, which drive the rear output shaft (15). The outer gears drive the smaller inner gears, which drive the hollow shaft (7). The hollow shaft transfers the torque to the intermediate gear (6) and then to the front output shaft (5).
The planetary gear system assembly contains a friction disc that is splined to the hollow shaft and applied to the planetary gear system housing to dampen vibrations in the system.