Elring 745.720 Differential Seal

Elring Differential Seal for Mercedes-Benz

Elring 745.720 is a differential seal built for Mercedes-Benz driveline applications that require a 40.0 mm inside diameter, 70.0 mm outside diameter, and 15 mm overall height. It uses ACM (polyacrylate) material and an A/B radial shaft seal design with right-hand twist swirl type for the listed Mercedes-Benz 300SE, 300SEL, 420SEL, 560SEL, 300D, 300TD, 380SE, 380SL, 380SEC, 380SEL, 380SLC, and 500SEL applications.

This Elring 745.720 seal is a direct-fit sealing component for differential service where the original seal has hardened, worn, or begun leaking. It cross-references Mercedes-Benz 022 997 99 47 for the same application.

Key Features

• Brand: Elring
• Part number: 745.720
• Category: Differential seal
• Material: ACM (polyacrylate)
• Inside diameter: 40.0 mm
• Outside diameter: 70.0 mm
• Height: 15 mm
• Radial shaft seal design: A/B
• Swirl type: RD, right-hand twist
• Dust cover: without dust lip

Detailed Description

Elring 745.720 is specified for Mercedes-Benz driveline and axle sealing applications where precise dimensions and seal geometry matter. The ACM construction is suited to differential sealing service, while the right-hand twist swirl type and A/B radial shaft seal design match the listed OE-style applications. Use this seal when servicing the differential on Mercedes-Benz 300SE, 300SEL, 420SEL, 560SEL, 300D, 300TD, 380SE, 380SL, 380SEC, 380SEL, 380SLC, and 500SEL models within the stated year ranges.

Vehicle Fitment

• Fits 1988-1991 Mercedes-Benz 300SE, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1988-1991 Mercedes-Benz 300SEL, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1986-1991 Mercedes-Benz 420SEL, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1986-1991 Mercedes-Benz 560SEL, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1983-1985 Mercedes-Benz 300D, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1977-1981 Mercedes-Benz 300D, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1981-1985 Mercedes-Benz 300TD, N/A; Rear; Inlet
• Fits 1984-1985 Mercedes-Benz 380SE, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1981-1985 Mercedes-Benz 380SL, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1984-1985 Mercedes-Benz 500SEL, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist; Inlet
• Fits 1982-1983 Mercedes-Benz 380SEC, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1981-1983 Mercedes-Benz 380SEL, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist; Inlet
• Fits 1982 Mercedes-Benz 300D, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist; Inlet
• Fits 1975-1976 Mercedes-Benz 300D, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist; Inlet
• Fits 1981 Mercedes-Benz 380SLC, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist
• Fits 1979-1980 Mercedes-Benz 300TD, N/A; Width: 15mm; Inner Diameter: 40mm; Outer Diameter: 70mm; Dust Cover: without dust lip; Swirl Type: Right-hand Twist; Inlet

Common Service Uses

• Replacing a leaking differential seal on Mercedes-Benz driveline assemblies
• Restoring sealing at the differential inlet area on listed Mercedes-Benz models
• Addressing gear oil seepage caused by worn or hardened shaft seal material
• Correcting seal wear where the original dust-lip style is not used
• Servicing OE-size differential sealing points with the correct 40 x 70 mm dimensions

Installation Notes and Tips

Verify the seal dimensions, swirl direction, and application notes before installation. Clean the sealing bore and shaft surface thoroughly, and inspect the mating surface for grooves or damage that could affect sealing performance. Match the listed Mercedes-Benz year, model, and position notes exactly, especially where the fitment specifies inlet or rear service.

Quality Assurance

Elring is a recognized sealing-system manufacturer, and this part is built to the listed OE-style dimensions and design details for the specified Mercedes-Benz applications. Confirm part number 745.720 against the vehicle’s original seal and interchange references before installation.