AUTO TRANS DIAGNOSIS - 722 SERIES
Article Text (p. 2)
1996 Mercedes-Benz C220
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, January 26, 2000 12:03PM
TRANSMISSION
Transmissions are fully automatic 4 or 5-speed consisting of
a 3-element welded torque converter, 2 or 3 compound planetary gear
sets, 2 or 3 multiple-disc clutches, one overrunning clutch and 3
brake bands. See Figs. 1 and 2. Brake bands control function of
planetary gear sets. A hydraulic system, pressurized by a primary gear
type pump and a secondary piston type pump provide working pressure
required to operate friction elements and automatic controls.
1st Gear
In 1st gear, brake band B-2 is applied and one-way converter
clutch is locked. In selector lever position "2", clutch K-2 is also
engaged. Both planetary gear sets are involved in gear reduction.
2nd Gear
In 2nd gear, brake band B-1 and brake band B-2 are applied.
Both planetary gear sets are involved in gear reduction.
3rd Gear
In 3rd gear, brake band B-2 is applied and clutch K-1 is
engaged. Only rear planetary gear set is involved in gear reduction.
4th Gear
In 4th gear, clutch K-1 and clutch K-2 are applied. Both
planetary gear sets rotate as a locked unit.
5th Gear
On 722.5 Series models, clutch K-1, clutch K-2 and overdrive
brake are applied in 5th gear. Overdrive clutch and 2nd one-way clutch
are also applied in all forward gears.
Reverse Gear
In reverse, brake B-3 is applied, one-way converter clutch is
locked, and clutch K-2 is engaged. Both planetary gear sets are
involved in gear reduction.
