Dayco 5070788 Serpentine Belt - Fan, Alternator and Air Conditioning or Main Drive
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Dayco

Dayco 5070788 Serpentine Belt - Fan, Alternator and Air Conditioning or Main Drive

Brand Dayco 5070788
Position Main Drive
Color Black
Cross Section K-Section
Effective Length 78.75
Effective Length 2000.25
Material EPDM, Aramid Reinforced
Maximum Operating Temperature 100
Maximum Operating Temperature 212
Minimum Operating Temperature -45
Minimum Operating Temperature -42.7
Outside Circumference 79.41
Outside Circumference 2017.02
Rib Depth Standard
Rib Profile Straight Rib
Rib Quantity 7
Standards SAE J1459, SAE J2432
Top Width .96
Fits Mercedes-Benz · 4 vehicles

Aramid reinforced. EPDM construction adds strength and durability.

Seven-rib design. Delivers reliable grip for accessory drive systems.

SAE standards. Built to meet J1459 and J2432 requirements.

Cross-references ACDelco 7K786, ACDelco K070786HD and CARQUEST K070786 for the same application. See all 9.

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Dayco 5070788 Serpentine Belt for Mercedes-Benz

The Dayco 5070788 serpentine belt is built for accessory drive service on select Mercedes-Benz diesel applications. It uses EPDM construction with aramid reinforcement to support stable operation across a wide temperature range, while the straight rib profile and 7-rib K-section design help maintain consistent belt tracking.

Compatible With 2017 Mercedes-Benz GLS350d, Main Drive, w/ Active Suspension, and 2012-2014 Mercedes-Benz ML350, Main Drive, w/o Active Suspension. This Dayco 5070788 belt is a direct-fit option for owners searching for a Mercedes-Benz GLS350d serpentine belt or a Mercedes-Benz ML350 main drive belt replacement.

  • EPDM rubber construction for durability in accessory drive service
  • Aramid reinforced for added tensile strength
  • 7-rib K-section design
  • Straight rib profile for stable pulley engagement
  • Black finish
  • Built to SAE J1459 and SAE J2432 standards
  • Operating temperature range: -45°F to 212°F

Detailed Product Overview

Dayco 5070788 is a serpentine belt for the main drive system on select Mercedes-Benz GLS350d and ML350 models. The belt measures 0.96 inches in top width, 78.75 inches in effective length, and 79.41 inches in outside circumference. Its EPDM, aramid-reinforced construction is specified for accessory drive applications where consistent belt tension and rib engagement are important. The 7-rib K-section layout and straight rib profile support proper routing across the accessory drive belt system.

This part cross-references Gates K070786 for the same application.

Common Replacement Reasons

  • Squealing or chirping from the accessory drive belt area
  • Visible cracking, glazing, or rib wear on the belt surface
  • Belt stretch that affects accessory drive performance
  • Loss of stable belt tracking on the main drive system
  • Service replacement for a worn Mercedes-Benz GLS350d or ML350 serpentine belt

Installation Notes and Tips

Verify belt routing against the vehicle’s accessory drive diagram before installation. Inspect pulleys, tensioners, and idlers for wear or misalignment, since those conditions can shorten belt life. Confirm the application matches the vehicle configuration: 2017 Mercedes-Benz GLS350d with active suspension, or 2012-2014 Mercedes-Benz ML350 without active suspension.

Quality Assurance

Dayco manufactures this belt to SAE J1459 and SAE J2432 standards, with EPDM and aramid reinforcement selected for demanding accessory drive service. Part number 5070788 is engineered for the listed Mercedes-Benz applications and temperature extremes from -45°F to 212°F.

Related reading

This part fits 4 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2017Mercedes-BenzGLS350d——Main Drivew/ Active Suspension
2014Mercedes-BenzML3503.0LV6Main Drivew/o Active Suspension
2013Mercedes-BenzML3503.0LV6Main Drivew/o Active Suspension
2012Mercedes-BenzML3503.0LV6Main Drivew/o Active Suspension
Directly replaces or cross-references 9 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 7K786ACDelco — K070786HDCARQUEST — K070786CARQUEST — K070786HDGates — K070786Gates — K070786HDGeneral Motors — 15020893Goodyear — 4070785NAPA — 25-070786