The Mercedes-Benz first series of automatic transmission, designated with series model numbers 722.0, 722.1 and 722.2, is a family of three and four-speed automatic transmission for engines with longitudinal layout for rear wheel drive passenger cars.
This transmission was the first Mercedes-Benz true automatic transmission in house developing.[1] Before this, the company used semi automatics systems like a vacuum-power shifting for overdrive or the "Hydrak" hydraulic automatic clutch system. Alternatively, they bought true automatics transmissions of other vendors, such BorgWarner.
The control of the fully automatic system is fully hydraulic and it uses electrical wire only for the kickdown solenoid valve and the neutral safety switch. Three-speed units use two planetary gear sets and 4-speed units use three planetary gear sets.[2]
Physically, it can be recognized for its pan which uses four bolts.
Units models
722.2 (K4C025 and K4A040)
The 722.2 is the first of the series, launched in April 1961 for the W111 220SEB, later replaced with the 722.0 and 722.1. It is a 4-speed unit and uses fluid coupling (also referred in some manuals as hydraulic/automatic clutch).
722.0 (W3A040 and W3B050)
The 722.0 is the strongest of the series, starting with the W3A040, W3B050 and a reinforced W3B050 (722.003) exclusively used in the W116 450 SEL 6.9. The second in the series, it was released initially for the W116 450SE and SEL in August 1972, and it uses torque converter instead of fluid coupling.[1][2] The transmission is used in V8 engines as a 3-speed unit.
722.1 (W4B025)
The 722.1 is a 4-speed unit, the last released in the series, that also uses torque converter.[2] Used in l4, l5 and l6 engines, it was not used in V8 models because it wasn't designed for handle that amount of torque, instead the 722.0 was used in those engines.
In normal situations, it starts in 2nd gear, but it will use 1st gear if kickdown is actuated (full throttle)[3] or if L position is selected in gear selector.
Applications
722.2
K4C025
W114 and W115 |
Chassis code |
Car model |
Engine code |
Transmission code |
114.015 and 114.615 | 230.6 | 180.954 | 722.203 |
114.017 and 114.617 | 230.6 Lang |
114.011 and 114.611 | 250 | 130.923 | 722.204 |
114.023 and 114.623 | 250C |
114.060 and 114.660 | 280 | 110.921 | 722.202 |
114.073 and 114.673 | 280C |
114.062 and 114.662 | 280E | 110.981 | 722.200 |
114.072 and 114.672 | 280CE |
115.015 and 115.615 | 200 | 115.923 | 722.205 |
115.010 | 220 | 115.920 |
115.115 and 115.715 | 200D | 615.913 | 722.206 |
115.110 and 115.710 | 220D | 615.912 |
115.112 | 220D Lang |
K4A040
R107 and C107 |
Chassis code |
Car model |
Engine code |
Transmission code |
107.043 | 350SL | 116.982 (D-Jet), 116.984 (K-Jet) | 722.201 |
107.023 | 350SLC |
107.024 | 450SLC | 117.982 (D-Jet), 117.985 (K-Jet) |
722.0
W3A040
R107 and C107 |
Chassis code |
Car model |
Engine code |
Transmission code |
Notes |
107.043 | 350SL | 116.982 (D-Jet), 116.984 (K-Jet) | 722.002 |
107.023 | 350SLC |
107.044 | 450SL | 117.982 (D-Jet), 117.985 (K-Jet) | 722.004 | Only for USA and Japan. |
107.024 | 450SLC |
W116 |
Chassis code |
Car model |
Engine code |
Transmission code |
Notes |
116.028 | 350SE | 116.983 (D-Jet), 116.985 (K-Jet) | 722.002 |
116.029 | 350SEL |
116.032 | 450SE | 117.983 (D-Jet), 117.986 (K-Jet) | 722.004 | Only for USA and Japan. |
116.033 | 450SEL |
W3B050
R107 and C107 |
Chassis code |
Car model |
Engine code |
Transmission code |
Notes |
107.044 | 450SL | 117.982 (D-Jet), 117.985 (K-Jet) | 722.001 | Worldwide except USA and Japan. |
W116 |
Chassis code |
Car model |
Engine code |
Transmission code |
Notes |
116.032 | 450SE | 117.983 (D-Jet), 117.986 (K-Jet) | 722.001 | Worldwide except USA and Japan. |
116.033 | 450SEL |
116.036 | 450SEL 6.9 | 100.985 | 722.003 | 722.003 (Reinforced W3B050)[4]. |
722.1
W4B025
R107 and C107 |
Chassis code |
Car model |
Engine code |
Transmission code |
107.042 | 280SL | 110.982, 110.986, 110.990 | 722.103, 722.112 |
107.022 | 280SLC | 110.982, 110.986 |
W114 and W115 |
Chassis code |
Car model |
Engine code |
Transmission code |
114.015 and 114.615 | 230.6 | 180.954 | 722.105 |
114.017 and 114.617 | 230.6 Lang |
114.011 and 114.611 | 250 | 130.923 | 722.104 |
114.023 and 114.623 | 250C |
114.060 and 114.660 | 280 | 110.921 | 722.102 |
114.073 and 114.673 | 280C |
114.062 and 114.662 | 280E | 110.981 | 722.103 |
114.072 and 114.672 | 280CE |
115.015 and 115.615 | 200 | 115.923 | 722.106 |
115.017 | 230.4 | 115.951 | 722.110 |
115.115 and 115.715 | 200D | 615.913 | 722.107 |
115.110 and 115.710 | 220D | 615.912 |
115.112 | 220D Lang |
115.117 | 240D | 616.916 | 722.108 |
115.119 | 240D Lang |
115.114 | 240D 3.0 | 617.910 | 722.109 |
W116 |
Chassis code |
Car model |
Engine code |
Transmission code |
Notes |
116.020 | 280S | 110.922 | 722.100, 722.102, 722.111 |
116.024 | 280SE | 110.983 (D-Jet), 110.985 (K-Jet) | 722.101, 722.103, 722.112 |
116.025 | 280SEL |
116.120 | 300SD | 617.950 | 722.120 | Only USA |
W123 |
Chassis code |
Car model |
Engine code |
Transmission code |
Notes |
123.020 | 200 | 115.938, 115.939 | 722.115 |
123.220 | 200 | 102.920, 102.939 | 722.121 |
123.280 | 200T |
123.023 | 230 | 115.954 | 722.119 |
123.083 | 230T |
123.043 | 230C |
123.223 | 230E | 102.980 | 722.122 |
123.283 | 230TE |
123.243 | 230CE |
123.026 | 250 | 123.920, 123.921 | 722.113 |
123.086 | 250T |
123.028 | 250 Lang |
123.030 | 280 | 110.923 | 722.111 |
123.050 | 280C |
123.033 | 280E | 110.984, 110.988 | 722.112 |
123.093 | 280TE |
123.053 | 280CE |
123.120 | 200D | 615.940 | 722.116 |
123.126 | 220D | 615.941 |
123.123 | 240D | 616.912 | 722.117 |
123.183 | 240TD |
123.125 | 240D Lang |
123.130 | 300D | 617.912 | 722.118 |
123.190 | 300TD |
123.132 | 300D Lang |
123.150 | 300CD | Only for USA |