Caterpillar 777D Transmission

Description

OEM-Quality Caterpillar 777D Transmission Assembly

Maintain peak gradeability, fast cycle times, and continuous drive torque across high-production haul routes with a heavy-duty Caterpillar 777D Transmission Assembly. Engineered specifically for Caterpillar’s 100-ton class (91.6-tonne nominal payload) off-highway mining trucks, this planetary power shift transmission efficiently manages heavy power output from the Cat 3508B EUI engine down through the driveshaft, rear differential, and final drives.

Integrated with Caterpillar’s Controlled Throttle Shifting (CTS) and electronic transmission controls, this module modulates engine speed with clutch engagement to ensure smooth gear transitions, reduce driveline shock loads, and extend gear life under full load conditions.

Key Features & Benefits

• 7-Speed Planetary Power Shift Architecture: Heavy-duty planetary gear sets provide 7 forward gear ratios and 1 reverse speed, optimized to maintain speed on steep haul road inclines.

• Torque Converter Lockup Drive: Automatically engages direct drive in higher gears to eliminate converter slip, maximizing mechanical fuel efficiency and higher haul speeds.

• Controlled Throttle Shifting (CTS): Coordinates engine RPM during gear shifts to absorb torsional shock, extending power train shaft and gear tooth longevity.

• High-Friction Hydraulic Clutch Packs: Utilizes advanced friction materials formulated to handle rapid directional changes and heavy continuous duty cycles without fading.

• High-Flow Filtration & Cooling Galleries: Internal galleries pass high oil volumes through dedicated transmission filters and liquid-to-oil heat exchangers to preserve oil viscosity.

• Direct Drop-In Chassis Fitment: Machined to exact Caterpillar 777D frame and torque converter housing tolerances for immediate replacement in standard mounting cradles.

Verified Technical Specifications