The Fendt 300 Vario Series represents a pinnacle of engineering in compact to mid-size agricultural tractors, renowned for its advanced Vario transmission technology. This series, encompassing models such as the 309 Vario, 310 Vario, 311 Vario, and 312 Vario, is distinguished by its continuously variable transmission (CVT) system, the ML 75 Vario, which provides infinitely variable speed control for optimal efficiency and performance. Fendt's commitment to quality, innovation, and operator comfort is evident in the robust construction, intuitive controls via the Varioterminal, and efficient engine management systems designed to maximize fuel economy and power delivery. These tractors are engineered for versatility and reliability in demanding agricultural applications, solidifying Fendt's position as a premium brand in the global market.
This service manual provides comprehensive guidance for the maintenance, repair, and troubleshooting of the Fendt 300 Vario Series tractors, with a specific focus on the ML 75 Vario transmission. It covers a wide array of critical systems, including hydraulic systems, hydrostatic drive components, electronic control units, and lubrication systems. Detailed procedures for diagnostics, component overhaul, routine maintenance tasks, and fluid specifications are included to ensure the longevity and optimal performance of the vehicle. This manual is an essential resource for owners, mechanics, and technicians, offering the technical depth required for both basic upkeep and complex repairs, all presented in German to ensure accuracy for the intended audience.
Model Variant:
309 Vario, 310 Vario, 311 Vario, 312 Vario
Transmission Model:
ML 75 Vario
Market Position:
Fendt is a premium brand within the AGCO Corporation, renowned for its advanced agricultural machinery, particularly its Vario transmissions, which offer continuously variable transmission (CVT) technology. This positions the tractors as high-performance, efficient, and technologically advanced solutions for modern farming.
Competitive Analysis:
The Fendt 300 Vario series competes with other premium manufacturers offering CVT technology, such as John Deere (AutoPowr/IVT), Claas (TERRA TRAC/CVT), and New Holland (Auto Command). Fendt's reputation for build quality, operator comfort, and fuel efficiency, driven by its Vario technology, is a key differentiator.
Key Features:
Infinitely variable speed control, intuitive operation via the Varioterminal, advanced engine management for optimal fuel economy and power delivery, robust chassis, and high-quality hydraulic systems. The ML 75 transmission is a core component enabling these features.
Coverage Areas:
Vario Transmission ML 75 for Fendt 309, 310, 311, 312 Vario tractors
Page Count:
Specific page count not provided, typical service manuals for this complexity are extensive, likely exceeding 300 pages.
Manual Type:
Service Manual
Format:
Likely Print or PDF
Systems Covered:
Hydraulic systems, hydrostatic drive components, electronic control units (ECUs) related to transmission operation, gear shifting mechanisms, clutch actuation, cooling systems for the transmission, lubrication systems, and differential locking systems (if integrated with transmission control).
Procedures Included:
Diagnostic procedures, troubleshooting guides for common faults, repair and overhaul procedures, component replacement instructions, calibration and adjustment specifications, routine maintenance tasks, fluid and filter change procedures, electrical system diagnostics specific to the transmission control.
Technical Depth:
Comprehensive, covering from basic maintenance checks to complete disassembly, repair, and reassembly of the Vario transmission unit.
File Format:
If PDF, expect high-resolution images and text, searchable functionality, bookmarked sections.
Print Quality:
Professional printing with clear diagrams, schematics, and text. High-quality paper stock for durability in workshop environments.
Binding Type:
Likely perfect bound or spiral bound for ease of use and lay-flat capability.
Paper Type:
Durable, coated paper suitable for workshop use, resisting grease and dirt.
Primary Engine:
Typically Deutz or AGCO Power 4-cylinder diesel engines.
Performance:
Specific horsepower and torque ratings vary by model (309, 310, 311, 312 Vario). For example, the 312 Vario might offer around 120-130 hp. The Vario transmission optimizes power delivery across the entire operating range.
Fuel System:
Common Rail direct injection, turbocharging with intercooling, and advanced emissions control systems (e.g., DOC, SCR) to meet Tier 4 standards.
Standard:
ML 75 Vario Continuously Variable Transmission (CVT)
Optional:
No optional transmissions are typically offered with Fendt Vario models; the Vario transmission is the defining feature.
Features:
Infinitely variable speed control from standstill to maximum road speed, split-power drivetrain for efficient power transfer, integrated PTO control, reverse shuttle functionality, electronic range selection, cruise control, and automatic engine speed adjustment based on load and speed.
Exterior:
Dimensions vary by specific model and configuration (e.g., tire size, front linkage). Typical Fendt 300 series tractors are compact to mid-size, designed for versatility.
Interior:
Focus on ergonomic design, spacious cab with excellent visibility, adjustable seating, and intuitive control interfaces (Varioterminal).
Cargo:
Not applicable in the traditional sense; refers to tractor's lifting and carrying capacities (e.g., front/rear hitch lift capacity, PTO power output).
Weights:
Operating weight varies but typically falls within a range suitable for medium-duty farm work. Key weights include unladen weight, front axle load, and rear axle load ratings.
Ratings:
Fendt tractors are engineered to meet stringent ROPS (Roll-Over Protective Structure) and FOPS (Falling-Object Protective Structure) safety standards. Specific crash test ratings are not applicable as they are not passenger vehicles.
Active Features:
Anti-lock Braking System (ABS) on hydraulic brakes, parking brake, differential lock, advanced braking systems for trailers, safety interlocks for PTO and hydraulics, speed limiters, stability control logic (integrated into transmission and engine management).
Passive Features:
ROPS certified safety cab, seatbelts, shatter-resistant glazing, robust chassis and frame construction, integrated lighting systems for visibility.
Infotainment:
While not 'infotainment' in the automotive sense, the tractor features the Varioterminal, a sophisticated interface for controlling transmission, hydraulics, PTO, and other tractor functions. It often includes basic audio systems and connectivity for external devices.
Driver Assistance:
Features include automatic engine and transmission management, cruise control, automatic PTO engagement/disengagement, electronic draft control for implements, and often options for GPS guidance systems.
Connectivity:
CAN bus communication for system diagnostics and integration with precision farming systems. Options for telematics and remote diagnostics are also available on higher-spec models.
Service Intervals:
Typical service intervals for engine oil and filters are around 500 hours. Transmission fluid and filter changes are critical and usually recommended every 1000-2000 hours, depending on operating conditions. Specific intervals will be detailed in the manual and Fendt service recommendations.
Fluid Specifications:
The ML 75 Vario transmission requires specific Vario transmission fluid (e.g., AGCO 725 fluid or equivalent approved fluids). Engine oil requirements are typically API CJ-4 or newer specifications. Hydraulic system fluid also has specific requirements.
Known Issues:
While generally robust, potential issues can include wear on certain transmission components under extreme stress, hydraulic control valve issues, or electronic sensor failures related to speed or load sensing. Regular maintenance and adherence to operating parameters as outlined in the manual are crucial.
Brand Heritage:
Fendt, founded by Xaver Fendt in 1928, has a long-standing reputation for innovation in agricultural machinery. They were pioneers in developing diesel tractors and introduced the first commercially successful Vario tractor in 1996, revolutionizing the industry with CVT technology.
Model Evolution:
The 300 Vario series represents a significant evolution in compact to mid-size tractors. Over generations, it has seen continuous improvements in engine technology, transmission control, cab comfort, and integration of electronic management systems. The ML 75 transmission is a key development enabling enhanced efficiency and performance in this range.
Production:
The Fendt 300 Vario series has been in continuous production, with various updates and series designations reflecting technological advancements. Production is primarily based in Marktoberdorf, Germany.
Recognitions:
Fendt tractors, including the 300 Vario series, have consistently received awards for innovation, design, and performance at major agricultural exhibitions and trade shows worldwide, often for their advanced technology and operator comfort.
