Mercedes-Benz
Source-verified model
Mercedes-Benz 722.5
The 5-speed automatic transmission 722.5 had been used on rear- and four-wheel drive vehicles (Gelendwagen) from 1990 to 1997. The 722.5 design is based on successful 4-speed solution 722.3. The construction of the 3-rd series is complemented with advanced electronic control and the clutch package Overdrive. Almost all componentsin the 722.5 unit are interchangeable with 722.3. All typical problems are also identical.
Speeds
5
Type
AT
Drive
RWD/AWD
Max torque
580
ATF capacity (L)
8,5
ATF change (L)
4
ATF type
236.14
Other and alternative codes of this transmission
722.5
722 5
722-5
129
7225
W 5 A 030
M129
W5A030
MERC129
verified naming
OEM designation
source name
Common problems & symptoms
Problems and symptoms reported for this transmission, compiled from repair sources. Not a complete list.
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Torque Converter Lock-up Clutch Wear
Friction linings of lock-up clutch wear out with active use, leading to torque converter failure requiring rebuild.
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Leaking Torque Converter Pump Seal
Leaking pump seal is the diagnostic sign of lock-up clutch friction lining wear-out in the torque converter.
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Reverse Package Piston Spring Damage
Reverse clutch pack piston springs fail due to age-related degradation, causing damage to the entire transmission unit.
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Pump Seal and Bushing Failure
Current pump seal and pump bushing frequently require replacement, commonly addressed during overhaul.
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Friction Components General Wear
All friction components frequently require full replacement during overhaul due to general wear across the unit.
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Gaskets and Seals Degradation
General gasket and seal wear requires a full repair kit during overhaul; typical for aging 722.5 units.
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Oil Filter Contamination
Oil filter replacement is a standard overhaul requirement, indicating susceptibility to contamination over service life.
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About this transmission
Transmission general data
The 5-speed automatic transmission 722.5 had been used on rear- and four-wheel drive vehicles (Gelendwagen) from 1990 to 1997. The 722.5 design is based on successful 4-speed solution 722.3. The construction of the 3-rd series is complemented with advanced electronic control and the clutch package Overdrive. Almost all componentsin the 722.5 unit are interchangeable with 722.3. All typical problems are also identical.
Technical issues and repair guidelines
The repair kit of gaskets and seals is ordered for reassembly of 722.5. In addition to typical overhaul procedures for this transmissions (replacement of gaskets and seals), repair specialists also replace the oil filter. The overhaul certainly includes repair of the torque converter caused by wear-out of friction linings of actively operating lock-up clutch (leaking pump seal is the sign of wear-out). In many cases, the repair consists of replacement of current pump seal and the pump bushing.
Transmission specialists also frequently have to replace all friction components. The package Reverse (piston) is replaced quite often because of damaged springs (because of old age) which are harmful for the whole unit.
The electrical part in the 722.5 unit (as well as hard parts) is quite reliable and its service life is compatible to the car's lifespan. Automatic transmission of 5-th series endures harsh operation conditions without any serious problems in contrast to following generations of 5- and 7-speed automatic transmissions 722.6 and 722.9.
Vehicle fitment explorer
Confirmed vehicle applications. Every row is drawn from our source-verified fitment database.
| Make | Model | Year | Drive | Engine |
|---|---|---|---|---|
| Mercedes-Benz | 300SL | 90-93 | 5 SP RWD | L6 3.0L |
| Mercedes-Benz | S CLASS | 94-95 | 5 SP RWD | L6 3.2L |
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Sources & Contribution
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