Allison S8610HR

The Allison S8610HR is a top-tier, fully automatic planetary transmission designed for extreme-duty tracked military and engineering vehicles that require high torque capacity, efficient power transfer, and integrated braking control. As part of Allison’s advanced Specialty “S” Series, the S8610HR is purpose-built for heavy tracked platforms such as combat recovery vehicles, self-propelled artillery, and combat engineering systems operating in the most challenging terrain and mission profiles.

The “H” indicates horizontal mounting, making it ideal for space-constrained vehicle hulls, while the “R” denotes the inclusion of a hydraulic retarder — a critical feature that enhances braking efficiency, reduces service brake wear, and improves vehicle control on long descents or during high-load operations. With six forward speeds, one reverse, a robust torque converter with lock-up clutch, and adaptive electronic control, the S8610HR combines brute strength with smart, terrain-responsive operation.

This transmission offers the durability, serviceability, and integrated control systems required for modern military vehicles, with a proven track record in global armored fleets and tactical support platforms.

Key Benefits of the S8610HR Transmission

• Extreme-duty torque capacity for the heaviest military tracked platforms
• Hydraulic retarder significantly improves braking performance and heat management
• Horizontal layout enables compact integration in low-clearance vehicle hulls
• Adaptive electronic controls optimize power delivery and drivetrain safety
• Modular architecture simplifies service and reduces lifecycle maintenance costs
• Proven reliability in global military operations and harsh field environments

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Technical Specifications:

• Model: S8610HR
• Series: Allison Specialty “S” Series
• Transmission Type: Fully automatic planetary transmission with integrated hydraulic retarder
• Mounting Orientation: Horizontal (low-profile design for armored vehicle hulls)
• Number of Speeds: 6 forward, 1 reverse
• Torque Converter: Hydrodynamic with lock-up clutch for enhanced fuel efficiency and reduced heat
• Integrated Retarder: Yes – hydraulic retarder for supplemental braking and improved control
• Maximum Input Torque: Up to 2,500 lb-ft (3,390 Nm)
• Gross Vehicle Weight Rating (GVWR): 120,000–150,000+ lbs (54,400–68,000+ kg), application dependent
• Primary Applications:
  • Tracked combat recovery vehicles
  • Armored bridge-laying and engineering vehicles
  • Heavy self-propelled artillery
  • Tactical support vehicles operating in mountainous or high-load conditions
• Cooling System:
  • External oil-to-air or oil-to-water system required
  • Separate retarder cooling circuit included
• Lubrication System: Full-pressure, filtered circulation with robust thermal tolerance
• Oil Specification: TES-295 or TES-668 approved synthetic transmission fluid
• Electronic Controls:
  • Allison TCM (Transmission Control Module)
  • Terrain-adaptive shift logic
  • Retarder control integration with vehicle braking system
• Diagnostics Compatibility:
  • Allison DOC® software
  • Monitors fluid life, clutch wear, retarder usage, and fault conditions
• PTO Capability: Optional, depending on application requirements
• Dry Weight: Approx. 1,900–2,100 lbs (861–953 kg), depending on configuration
• Construction Features:
  • Military-spec rugged housing and internal gearing
  • Modular design for simplified field maintenance and part replacement
  • Retarder brake cooling channels for improved thermal performance