Mercedes 722.1-722.2 Transaxle Service Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Transmission Series: 722.1 / 722.2 Transmission Type: Automatic Transaxle Codes Internal Transmission Codes: 722.1xx, 722.2xx 👋 Introduction Market Position Target Audience: Professional Mercedes-Benz technicians,...

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标签: 722.1 Transaxle 722.2 Transaxle Car Cars Mercedes Misc

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Description

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Transmission Series:

722.1 / 722.2

Transmission Type:

Automatic Transaxle

Codes

Internal Transmission Codes:

722.1xx, 722.2xx

👋 Introduction

Market Position

Target Audience:

Professional Mercedes-Benz technicians, independent repair shops, advanced DIY enthusiasts

Competitive Analysis

Value Proposition:

Provides in-depth technical knowledge for accurate diagnosis and repair of a complex automatic transmission, often surpassing generic repair manuals in detail.

Key Features

Features:

Detailed diagrams, step-by-step procedures, torque specifications, special tool recommendations

📋 Manual Details

Coverage Areas

Primary Coverage:

Service, Repair, Maintenance, Troubleshooting, Overhaul

Secondary Coverage:

Component identification, torque specifications, electrical diagrams related to transmission control

Page Count

Estimated Page Count:

250-400 (varies by specific edition/printing)

Manual Type

Type:

Service and Repair Manual

Language

Language:

English

Format

Format:

Printed or Digital (PDF)

📖 Manual Coverage

Systems Covered

Primary Systems:

Torque converter, valve body, planetary gear sets, clutch packs, band brakes, hydraulic control system, lubrication system, cooling system (transmission cooler lines)

Related Systems:

Transmission control module (TCM) diagnostics (if applicable to specific models), shifter linkage, drive shaft connections

Procedures Included

Maintenance Procedures:

Fluid level checks and changes, filter replacement, external inspection

Repair Procedures:

Complete disassembly and reassembly, clutch pack replacement, seal replacement, band adjustment/replacement, valve body overhaul, governor calibration, solenoid testing (if applicable)

Troubleshooting Procedures:

Diagnostic flowcharts for common symptoms (slipping, harsh shifting, no engagement), pressure testing, electrical continuity checks

Technical Depth

Depth:

Comprehensive rebuild and detailed diagnosis

📊 Manual Specifications

File Format

Digital Format Details:

Searchable PDF, printable pages, high-resolution diagrams

Print Quality

Print Quality Details:

High-quality paper, clear text and diagrams, durable binding

Binding Type

Binding Type Details:

Stapled, perfect bound, or comb-bound (depending on printing)

Paper Type

Paper Type Details:

Heavyweight, glossy or matte paper for diagrams and technical drawings

⚙️ Engine Specifications

Primary Engine

Typical Engine Applications:

Various Mercedes-Benz inline-4, inline-6, and V8 gasoline and diesel engines of the era

Performance

Performance Impact:

Reliability and performance of the automatic transmission directly impacts overall vehicle drivability and fuel efficiency.

Fuel System

Fuel System Interaction:

Transmission control often integrates with engine management systems, requiring understanding of shared sensor inputs.

🔧 Transmission

Standard

Standard Transmission Type:

4-speed automatic transaxle

Optional

Optional Transmission Types:

Certain variations or updates to the 722.1/722.2 series might exist for specific model lines.

Features

Transmission Features:

Hydromechanical control, torque converter with lock-up clutch (on later versions), robust construction for its time.

Gear Ratios:

Specific gear ratios vary by application, detailed in manual

Fluid Specifications:

Typically requires Dexron II or equivalent ATF. Specific MB fluid specifications like MB 236.1 or MB 236.2 may apply. Consult manual for exact MB specification.

Fluid Capacity:

Approximately 7-9 liters (7.4-9.5 US quarts) depending on model and torque converter drain. Refer to manual for precise capacity.

📐 Dimensions

Exterior

Vehicle Impact:

Transaxle design influences vehicle layout (e.g., rear-wheel drive configurations, early all-wheel drive).

Interior

Vehicle Impact:

Shifter mechanism and console design.

Cargo

Vehicle Impact:

Transmission length and width can influence drivetrain layout.

Weights

Transmission Weight:

Approximately 60-80 kg (130-175 lbs) dry weight, depending on specific variant.

🛡️ Safety Features

Ratings

Safety Ratings Impact:

Properly functioning transmission is critical for predictable vehicle behavior and safety.

Active Features

Safety Features Reliance:

Transmission control logic can influence ABS, Traction Control (ASR), and stability control systems.

Passive Features

Passive Safety Impact:

Transmission integrity contributes to overall vehicle structural safety in a crash.

💡 Technology Features

Infotainment

Infotainment Interaction:

Minimal direct interaction; transmission performance influences driving experience.

Driver Assistance

Driver Assistance Integration:

Early versions may have basic integration with cruise control. Later models might have rudimentary integration with traction control (ASR) systems.

Connectivity

Connectivity Interaction:

No modern digital connectivity; relies on hydraulic and mechanical control, with some electrical inputs for shift solenoids and sensors on later variants.

🔧 Maintenance

Service Intervals

Fluid Change Interval:

Typically every 30,000 to 60,000 miles (50,000 to 100,000 km) or as specified by Mercedes-Benz for the specific vehicle model and operating conditions. Refer to manual for precise intervals.

Filter Replacement Interval:

Recommended at every fluid change or every other fluid change, depending on service history and conditions. Consult manual.

Fluid Specifications

Approved Atf Types:

Dexron II, Dexron IIE, or Mercedes-Benz specifications like MB 236.1/236.2. It is crucial to use the exact specified fluid. Improper fluid can cause severe damage.

Known Issues

Common Failures:

Worn clutch packs, leaking seals (input shaft, output shaft, cooler lines), valve body issues (stuck valves, worn bores), modulator valve problems, vacuum modulator failure (if equipped), kickdown switch issues, worn governor.

Preventative Maintenance:

Regular fluid and filter changes are crucial. Address any leaks promptly. Avoid harsh acceleration and excessive towing if not properly equipped.

📚 Vehicle History

Brand Heritage

Mercedes Benz Transmission Development:

Mercedes-Benz has a long history of engineering advanced automatic transmissions.

Model Evolution

722 Series Evolution:

The 722.1 and 722.2 series were workhorse transmissions for Mercedes-Benz in the late 1970s through the 1980s, evolving from earlier designs and preceding the more advanced electronic control transmissions.

Production

Typical Vehicle Applications:

Found in models such as Mercedes-Benz W123, W124, W126, R107 chassis vehicles, and various commercial vehicles.

Production Era:

Approximately late 1970s to early 1990s.

🏆 Awards & Recognition

Recognitions

Industry Recognition:

While specific awards for this transmission series are not commonly cited, Mercedes-Benz transmissions of this era were generally recognized for their durability and smooth operation when properly maintained.