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CAT 789D Transmission 2

Caterpillar 789D Transmission

Caterpillar 789D Transmission | 6-Speed Power Shift Assembly

OEM-spec Caterpillar 789D transmission assembly engineered for 200-ton mining haul trucks. Features an electronically controlled 6-speed forward, 1-speed reverse planetary power shift transmission paired with Advanced Productivity Electronic Control Strategy (APECS) for maximum torque transfer, continuous power delivery, and smooth gear transitions under severe mining loads.

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Description

OEM-Quality Caterpillar 789D Transmission Assembly

Maintain peak power distribution, smooth shifting, and maximum rimpull across high-production mining routes with a heavy-duty Caterpillar 789D Transmission Assembly. Engineered specifically for Caterpillar’s 200-ton class (181-tonne nominal payload) off-highway haul trucks, this electronically controlled planetary power shift transmission efficiently manages heavy engine output from the Cat 3516B/3516C HD engine down through the differential and final drives.

Integrated with Caterpillar’s APECS (Advanced Productivity Electronic Control Strategy) technology, this transmission maintains drive momentum during shifting on steep incline hauls, extending clutch disc longevity and minimizing overall cycle times.

Key Features & Benefits

  • 6-Speed Planetary Power Shift: Heavy-duty planetary gear sets provide 6 forward gear ratios and 1 reverse ratio, optimized for efficient power management under maximum payload.

  • APECS Electronic Integration: Maintains hydraulic pressure across gear changes to prevent momentum loss on steep grade climbs while reducing torque shock to the driveline.

  • Controlled Throttle Shifting (CTS): Coordinates engine RPM with transmission clutch engagement to ensure exceptionally smooth shifts and reduced mechanical wear.

  • High-Friction Clutch Materials: Utilizes advanced clutch pack materials designed to endure severe thermal friction during continuous, heavy-load directional and speed changes.

  • High-Capacity Fluid Filtration & Cooling: Precision internal galleries permit high oil flow rates through filters and transmission oil coolers to resist breakdown during extended haul cycles.

  • Direct OEM Frame Mounting: Built to exact Caterpillar 789D chassis and flywheel housing specifications for direct drop-in replacement into standard mounting cradles.

Verified Technical Specifications

Parameter Specification
Compatible Machine Model Caterpillar 789D Mining / Off-Highway Truck
Engine Compatibility Cat 3516B / Cat 3516C HD TA Diesel Engine
Transmission Type Electronically Controlled Planetary Power Shift
Speeds 6 Forward / 1 Reverse
Shift Control Technology APECS & Controlled Throttle Shifting (CTS)
Top Speed (Loaded) 57.2 km/h (35.5 mph)
Transmission Sump Fluid Refill 70 L (18.5 gal)
Application Main Power Train Transmission Group

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