Allison S6610HR

The Allison S6610HR transmission is a high-capacity, fully automatic system engineered for heavy-duty tracked military and tactical vehicles that demand maximum driveline control, advanced braking capability, and high input torque tolerance. A member of the ruggedized “S” Series from Allison Transmission, the S6610HR combines the proven performance of the S6610H model with the integration of a hydraulic retarder — denoted by the “R” suffix — to provide enhanced braking control and thermal management during prolonged high-load operations or steep descents.

This 6-speed, horizontally mounted transmission is ideal for combat and engineering platforms that operate in extreme environments where braking performance and drivetrain preservation are mission-critical. With a torque converter featuring lock-up clutch, advanced electronic control modules, and terrain-adaptive shift logic, the S6610HR offers smooth gear transitions, real-time diagnostics, and seamless integration into advanced armored vehicle systems. It is particularly suited for tracked vehicles requiring integrated braking support, such as bridge layers, armored recovery vehicles, and self-propelled artillery.

Key Benefits of the S6610HR Transmission

• Integrated hydraulic retarder improves vehicle braking safety and reduces wear on service brakes
• High torque capacity for large, heavy tracked vehicles in extreme conditions
• Advanced electronic controls improve efficiency, shift smoothness, and driveline protection
• Horizontal layout optimizes space in armored hulls and engineering platforms
• Proven reliability in military, tactical, and engineering support vehicles

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Technical Specifications:

• Model: S6610HR
• Series: Allison Specialty “S” Series
• Type: Fully automatic planetary transmission with hydraulic retarder
• Mounting Orientation: Horizontal (flat-profile for armored vehicle hull integration)
• Number of Speeds: 6 forward, 1 reverse
• Torque Converter: Hydrodynamic with lock-up clutch
• Integrated Retarder: Yes – hydraulic retarder for supplemental braking and heat dissipation
• Maximum Input Torque: Up to 2,250 lb-ft (3,051 Nm)
• Gross Vehicle Weight (GVW): 90,000–130,000+ lbs (40,800–58,900+ kg), application dependent
• Primary Applications:
  • Tracked combat engineering vehicles
  • Armored bridge layers and mine-clearing vehicles
  • Armored personnel carriers with integrated braking needs
  • Self-propelled artillery and tactical tracked systems
• Cooling Requirements:
  • External oil-to-air or oil-to-water system mandatory
  • Retarder-specific cooling circuit included
• Lubrication System: Pressurized with high-efficiency full-flow filtration
• Oil Specification: TES-295 or TES-668 approved synthetic automatic transmission fluid
• Electronic Controls:
  • Allison Transmission Control Module (TCM) with adaptive shift programming
  • Built-in shift inhibition and terrain response logic
• Diagnostics Compatibility:
  • Fully compatible with Allison DOC® software
  • Real-time monitoring of clutch life, temperature, fluid condition, and fault codes
• PTO Capability: Optional, depending on vehicle design
• Dry Weight: Approx. 1,750–1,850 lbs (794–839 kg), depending on retarder and auxiliary options
• Additional Features:
  • Retarder provides braking power independent of service brakes
  • Modular design allows for faster maintenance and replacement
  • Engineered for extreme-duty cycles and long-duration torque delivery
  • Supported in global military and high-mobility tracked fleets