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Planetary gear set, location/task/design/function - GF27.50-P-5100NN

TRANSMISSION 722.9 in MODEL 171.4, 203, 230 up to Model Year 08/modification year 07 single planetary gear set 

TRANSMISSION 722.9 in MODEL 209, 211, 215, 219, 220 single planetary gear set 

TRANSMISSION 722.9 in MODEL 463.303/340/341 

Fig 1: Locating Single Planetary Gear Systems
G07287870Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Planetary gear set, location The front single planetary gear set (12a) and the rear single planetary gear set (12b) are located in the mechanical part of the transmission.  
Planetary gear set, task Power transmission and production of different gear ratios.  
Planetary gear set, design A single planetary gear system consists of a ring gear, the planetary gears mounted in the planet carrier and a sun gear.  
Planetary gear set, function   GF27.50-P-5100-01NN