The Allis-Chalmers 715B Backhoe

[MikePhua]

Introduction to the Allis-Chalmers 715B Backhoe
The Allis-Chalmers 715B backhoe, introduced in 1979, stands as a notable model in the history of construction and agricultural machinery. Allis-Chalmers, a company with a rich history in industrial and agricultural equipment, was known for producing reliable and durable machinery. The 715B was part of their legacy, designed to meet the needs of both the construction and utility industries. This backhoe loader is often remembered for its power, ease of use, and versatility, making it a valuable tool for many operators during its time in service.
Development History of Allis-Chalmers and the 715B Model
Allis-Chalmers, an American industrial giant, was founded in 1901 and became a prominent manufacturer of heavy machinery, particularly known for its tractors, industrial engines, and construction equipment. The company was responsible for numerous innovations in machinery technology, but by the late 20th century, it faced increasing competition from other major manufacturers like John Deere, Caterpillar, and Case.
The 715B backhoe was developed as part of Allis-Chalmers’ effort to remain competitive in the rapidly evolving market for construction machinery. The 715B was engineered to provide operators with a reliable, easy-to-maintain backhoe loader that could handle a wide range of tasks, from digging and trenching to lifting and hauling materials. It featured a robust engine and hydraulic systems that were designed for performance, durability, and ease of operation.
Key Features of the Allis-Chalmers 715B Backhoe
The Allis-Chalmers 715B came equipped with a variety of features that made it highly efficient for various tasks:

1. Engine Performance:
   • The 715B was powered by a powerful engine, typically a diesel unit capable of delivering ample horsepower for demanding tasks. This engine was designed to provide consistent performance, even under heavy loads, making the 715B a reliable choice for construction sites.
     
2. Hydraulic System:
   • One of the standout features of the 715B was its hydraulic system. The machine’s hydraulics allowed for smooth and powerful operation of the backhoe arm and loader bucket, making it ideal for digging, lifting, and precise material handling. The system’s efficiency also contributed to reduced fuel consumption, a major consideration for operators at the time.
     
3. Operator Comfort:
   • The Allis-Chalmers 715B was designed with operator comfort in mind. The cab was spacious and provided good visibility, which is important when operating a backhoe for long hours. The seat was adjustable, and controls were designed for easy access, minimizing operator fatigue.
     
4. Versatility:
   • The 715B featured a quick-change loader bucket system, which allowed operators to switch out buckets or attachments quickly, enhancing the versatility of the machine. This was a key feature for operators who needed a machine that could perform multiple tasks on a job site, from digging trenches to loading materials.
     
5. Maneuverability and Stability:
   • The 715B backhoe offered impressive stability, especially when operating in tough terrain. The design of the machine, combined with its hydraulic outriggers, allowed for stable operation even during heavy lifting and digging tasks. Its compact size also made it easy to maneuver in tight spaces, which is a significant advantage for urban construction projects or small worksites.
     

Common Issues and Maintenance Tips
Like many older backhoes, the Allis-Chalmers 715B backhoe may experience some common issues as it ages, especially as parts begin to wear out. Proper maintenance is essential to ensuring the longevity and performance of this equipment.

1. Hydraulic Leaks:
   • Over time, hydraulic hoses and seals can wear out, leading to leaks. Regularly inspecting the hydraulic system and replacing worn components is crucial to maintaining performance.
     
2. Engine Overheating:
   • The engine can sometimes overheat if the radiator or cooling system is clogged. It is important to regularly check the cooling system for debris and ensure that the radiator is clean and functioning properly.
     
3. Transmission Issues:
   • The 715B’s transmission system, while sturdy, can experience problems such as slipping or rough shifting as the machine ages. Regular fluid checks and replacing filters as needed can help prevent transmission problems.
     
4. Electrical System Problems:
   • The electrical system, including the starter, battery, and wiring, can be prone to issues in older machines. Regularly cleaning and tightening connections, as well as replacing the battery if necessary, can prevent these problems.
     
5. Tire Wear:
   • Since backhoes often operate on rough terrain, tire wear is a common issue. Keeping an eye on tire pressure and replacing tires when necessary will ensure optimal performance and safety.
     

How to Extend the Life of the Allis-Chalmers 715B
Maintaining an older machine like the Allis-Chalmers 715B requires careful attention to its components. Here are a few tips to help extend its lifespan:

1. Regular Fluid Changes:
   • Regularly changing the engine oil, hydraulic fluid, and transmission fluid is essential to keep the machine running smoothly. These fluids help lubricate and cool the components, reducing wear and tear.
     
2. Monitor the Battery and Charging System:
   • The electrical system should be checked periodically to ensure the battery is charging correctly. A failing battery or alternator can lead to unexpected breakdowns.
     
3. Inspect the Hydraulic System:
   • The hydraulic system should be checked for leaks, and the filters should be replaced regularly. A well-maintained hydraulic system is key to the 715B’s performance.
     
4. Routine Greasing:
   • The machine’s moving parts, such as the backhoe arm and loader bucket joints, should be greased regularly to prevent friction and wear.
     
5. Check and Replace Worn Tires:
   • Tires should be inspected for wear and replaced when they become worn down. Proper tire maintenance ensures better traction and stability on the job site.
     

The Legacy of the Allis-Chalmers 715B Backhoe
Although Allis-Chalmers ceased producing construction equipment in the late 1980s, their machines like the 715B continue to be valued for their durability and performance. Many used Allis-Chalmers 715B backhoes are still in service today, with owners who appreciate the quality and longevity of these machines. Parts for older models can sometimes be difficult to find, but there is a strong community of operators and mechanics who specialize in vintage Allis-Chalmers equipment.
Allis-Chalmers’ impact on the construction equipment industry is still felt, and their commitment to building rugged, reliable machinery lives on in the 715B and other models. The 715B, despite being over 40 years old, remains a testament to the quality engineering that Allis-Chalmers was known for.
Conclusion
The Allis-Chalmers 715B backhoe loader represents a classic piece of equipment that played a vital role in construction and utility work during its time. With its powerful engine, efficient hydraulics, and operator-friendly design, it became a go-to choice for many contractors. Today, it is remembered fondly by those who worked with it, and its legacy endures through its continued use in the field. By adhering to proper maintenance practices, operators can continue to get reliable service from this machine for many years to come.