GFT36/131, GFT8130E, GFT50/177 and GFT36/131 are Rexroth HYDROTRAC original planetary reducers for travel and winch drives, compatible with HIAB truck-mounted cranes, hook-lift trucks and other machinery hydraulic systems.
Product Overview
The GFT series refers to Rexroth’s integrated planetary gear reducers with built-in brakes for travel and winch applications. They need to be assembled with a piston hydraulic motor to form a complete drive unit and connect to the machine’s overall hydraulic system. Adopting 2-stage or 3-stage planetary gear structure and a multi-disc spring-applied hydraulically-released parking brake, these compact hub-mounted reducers can be installed inside crawler hubs or winch drums. As core heavy-duty low-speed high-torque transmission components for construction machinery, they can perfectly match JHP high-pressure gear pumps and Danfoss orbital hydraulic motors to build a full hydraulic power assembly.
Model Coding Rule
Take GFT60/106 as an example:
1. GFT: Series code for Rexroth travel & winch reducers
2. 36/50/60/81: Frame size, representing rated output torque grade; larger figures mean higher torque capacity
3. /131, /177, /106, /30: Exact reduction ratio (Input speed ÷ Output speed); a higher ratio stands for slower output speed and larger output torque
- GFT8130E: Frame size GFT81 with reduction ratio 30; suffix E denotes a structural version for winch use with optional emergency manual disengagement clutch
Detailed Specifications of 4 Models
1. GFT36/131
- Frame: GFT36, general medium-low torque type
- Reduction ratio: i=131, ultra-high reduction ratio
- Rated output torque: 36,000 N·m
- Structure: 3-stage planetary reduction with standard built-in parking brake
- Matched hydraulic motor: Small-displacement A2FM / A6VM axial piston hydraulic motor
- Application: Mini crawler undercarriages, aerial work platforms, light-duty winches and travel drives for small-tonnage HIAB truck cranes, suitable for medium and small hydraulic systems
2. GFT50/177
- Frame: GFT50, mainstream medium-heavy duty model
- Reduction ratio: i=177, the largest reduction ratio among the four models for ultimate low-speed high-torque performance
- Rated output torque: 50,000 N·m
- Structure: Heavy-duty 3-stage planetary gears with reinforced main bearings to withstand impact loads
- Matched hydraulic motor: A2FM56 / A2FM63 series piston hydraulic motor
- Application: Undercarriages for 8–16 ton excavators, small rotary drilling rigs and heavy-duty hook-lift trucks, a standard fit for heavy hydraulic systems
3. GFT60/106
- Frame: GFT60, popular medium-large torque model with high aftermarket replacement demand
- Reduction ratio: i=106, standard commonly used ratio
- Complete full model: GFT60T3B106 (T3 = 3-stage reduction)
- Matched hydraulic motor: A2FM80 / A2FM90 piston hydraulic motor
- Application: Undercarriages for 16–25 ton excavators, main winches of large-tonnage HIAB truck cranes, truck-mounted winches and small port lifting equipment, a hot-selling replacement part for hydraulic export business
4. GFT8130E (GFT81/30-E)
- Frame: GFT81, heavy-duty large frame size
- Reduction ratio: i=30, low reduction ratio for relatively high output speed
- Rated output torque: 81,000 N·m
- Suffix E: Upgraded customized version equipped with emergency manual mechanical disengagement clutch for towing under breakdown conditions
- Structure: 2-stage planetary reduction for high-speed output
- Matched hydraulic motor: Large-displacement A6VM variable hydraulic motor
- Application: Main winches of large crawler cranes, rotary drilling rigs and mining equipment travel mechanisms, applied to high-power closed-loop hydraulic systems
General Structural Features & Advantages
1. Modular integrated design: The reducer cavity can accommodate an embedded hydraulic motor for all-in-one assembly into the machine hydraulic system without extra couplings to save installation space.
2. Gear material: Sun gears and planet gears are made of carburized and quenched alloy steel with precision grinding for high load capacity and long service life, adapting to dusty, low-temperature harsh construction-site conditions.
3. Brake configuration: Standard multi-disc wet spring-engaged hydraulic-release parking brake locks loads automatically at shutdown to prevent rolling or hook slipping; brakes disengage upon hydraulic oil supply.
4. Optional configurations: Mechanical disengagement device, speed sensors and flushing oil circuits are available for both open and closed hydraulic systems.
5. Operational merits: Low running noise (≤75dB), 92%–95% transmission efficiency, heavy-duty radial & axial bearings to bear lateral hub loads and reduce frequent maintenance & oil changes.
