This comprehensive service manual provides detailed information for Yanmar Crawler Backhoes, specifically the B12-2B and B17-2B models. Whether you're a seasoned professional mechanic or a first-time owner, this manual is designed to guide you through every aspect of maintenance and repair. It offers clear and accessible instructions, ensuring you can perform procedures correctly. The manual covers all aspects of the B12-2B and B17-2B models, including their respective engines, the 3TNA72L-UBA and 3TNA72L-UBB. You'll find in-depth information on all parts, accompanied by detailed wiring diagrams. This manual is an essential resource for anyone who wants to ensure the longevity and optimal performance of their Yanmar Crawler Backhoe. By using this service manual regularly, you can perform routine and preventive maintenance, ultimately saving time and money by preventing premature failures and unnecessary repairs.

The Yanmar B12-2B and B17-2B crawler backhoes are powerful and versatile machines designed for a wide range of construction, landscaping, and utility applications. These compact backhoes offer excellent maneuverability and digging performance in tight spaces, making them ideal for projects where accessibility is limited. The B12-2B and B17-2B models share a similar design, featuring a robust, high-strength chassis, a reliable Yanmar diesel engine, and a versatile hydraulic system that powers both the backhoe and the crawler tracks. Both models offer a variety of optional attachments, including buckets, augers, hammers, and rippers, enhancing their versatility and efficiency on the job site. The B12-2B is powered by a Yanmar 3TNV88 engine, delivering 31.5 horsepower, while the B17-2B boasts a more powerful Yanmar 4TNV98 engine, delivering 41.8 horsepower. These engines are known for their fuel efficiency, low emissions, and quiet operation. Both models feature a robust excavator arm with a maximum digging depth exceeding 14 feet, providing ample reach and power for excavation, trenching, and material handling tasks. The crawler tracks offer superior traction and stability, ensuring smooth operation even in challenging terrain. The operator's cab is designed for comfort and safety, featuring ergonomic controls, excellent visibility, and a comfortable seat. The Yanmar B12-2B and B17-2B crawler backhoes are well-regarded in the construction industry for their reliability, performance, and ease of maintenance. These machines offer a compelling combination of power, maneuverability, and versatility, making them an excellent choice for contractors and operators seeking efficient and dependable equipment for a wide range of tasks.