JD 700J LT: Key Features, Performance, and Common Issues

[MikePhua]

Introduction to the JD 700J LT
The John Deere 700J LT is a powerful, reliable crawler dozer designed for heavy-duty earthmoving tasks. Known for its advanced features and robust performance, this model is often used in construction, mining, and other industrial applications. However, like any piece of heavy equipment, the 700J LT can experience its own set of challenges. This article provides an overview of the JD 700J LT’s key features, performance attributes, and common issues based on user experiences.
Key Features of the JD 700J LT
The JD 700J LT is part of John Deere's 700 series of crawler dozers. It is designed to handle a variety of demanding tasks, from grading and pushing material to fine finishing work. Some of the standout features of this model include:

1. Powerful Engine: The JD 700J LT is powered by a John Deere 4045H engine, which delivers excellent performance with a net horsepower of approximately 125 hp. The engine is designed to handle tough jobs while offering fuel efficiency.
   
2. Hydrostatic Transmission: The 700J LT is equipped with a hydrostatic transmission, providing smooth and precise control of the dozer. This system allows for quick directional changes and precise maneuvering, ideal for tight spaces or delicate grading operations.
   
3. Long Track (LT) Configuration: The "LT" in JD 700J LT stands for long track, which improves flotation and stability. The long tracks reduce ground pressure, allowing the dozer to operate in soft or uneven terrain without sinking or causing excessive damage to the ground.
   
4. Advanced Hydraulic System: The hydraulic system in the JD 700J LT provides the power needed for lifting, pushing, and operating attachments. It’s designed for high efficiency, ensuring that the dozer performs optimally even under heavy loads.
   
5. Operator Comfort: The cabin of the JD 700J LT is designed with operator comfort in mind. It features a spacious, ergonomically designed environment with controls that are easy to operate. The dozer also comes with a heating and air-conditioning system to ensure comfort in all weather conditions.
   

Performance and Capabilities
The JD 700J LT is built for versatility and performance. Its engine and hydraulic system allow it to tackle a variety of tasks efficiently:

1. High Push Capacity: The long track design and powerful engine allow the 700J LT to push large amounts of material with ease. It is commonly used for jobs such as land clearing, trenching, and grading.
   
2. Precise Blade Control: Thanks to the hydrostatic transmission and advanced hydraulic systems, operators can control the blade with high precision, making it ideal for both rough grading and fine finishing tasks.
   
3. Enhanced Traction and Stability: The long tracks on the JD 700J LT provide better traction and stability, especially when operating on uneven ground. This makes the machine highly effective on softer terrains where traditional dozers may struggle.
   
4. Fuel Efficiency: The combination of the efficient engine and hydrostatic transmission helps improve the fuel economy of the 700J LT. It provides a good balance of power and efficiency, which is especially beneficial for long-term operational costs.
   

Common Issues with the JD 700J LT
While the JD 700J LT is a reliable and robust dozer, it is not immune to common mechanical issues that can arise during regular use. Some of the common problems reported by operators include:

1. Hydraulic System Issues: One of the more frequent issues faced by operators is related to the hydraulic system. Some users have reported problems with the hydraulic pumps or valves, which can affect blade movement and overall machine performance. Regular inspection and maintenance of the hydraulic components can help mitigate this problem.
   
2. Transmission Problems: A few users have experienced issues with the hydrostatic transmission, especially when the machine is under heavy load. This can lead to erratic movement, delayed response, or even complete transmission failure if not addressed promptly.
   
3. Track Tension Problems: Improper track tension can cause issues with the machine's performance, including poor traction or uneven wear on the tracks. Operators need to monitor the track tension regularly and adjust it as needed to ensure optimal performance.
   
4. Cooling System Overheating: Some JD 700J LT operators have reported overheating problems with the cooling system. Overheating can occur if the radiator or cooling fan becomes clogged with debris or if the coolant levels are low. Regular cleaning and maintenance of the cooling system are crucial to prevent overheating and ensure proper engine operation.
   
5. Electrical Problems: Electrical issues, such as faulty wiring or malfunctioning sensors, can also arise. These issues may cause problems with the operation of the dozer, including issues with the starting system or control panel. Keeping the electrical system in good condition is important to avoid unexpected breakdowns.
   
6. Uneven Blade Control: Although the JD 700J LT offers precise blade control, some operators have reported difficulties with uneven blade operation or sluggish response. This could be due to hydraulic issues, wear on the blade control system, or other related components.
   

Maintenance Tips for the JD 700J LT
To keep the JD 700J LT in optimal working condition, regular maintenance is essential. Here are a few tips based on the experiences of other operators:

1. Routine Hydraulic System Checks: Regularly inspect the hydraulic system for leaks, damage, or low fluid levels. Keep the hydraulic fluid clean and ensure the filters are replaced according to the manufacturer’s schedule.
   
2. Transmission Maintenance: Check the hydrostatic transmission for any signs of wear or irregular behavior. Keep the transmission fluid at the recommended level and replace it as needed to ensure smooth operation.
   
3. Track Maintenance: Regularly check the tracks for proper tension and alignment. Adjust the track tension as necessary to prevent uneven wear and maintain proper traction. Also, inspect the track rollers and idlers for wear and replace them if necessary.
   
4. Cooling System Inspection: Clean the radiator and cooling fan regularly to ensure there is no blockage preventing airflow. Check the coolant levels and replace the coolant as recommended by the manufacturer to prevent engine overheating.
   
5. Electrical System Inspection: Inspect the electrical system for loose connections, worn wiring, or malfunctioning sensors. Make sure all connections are clean and tight to prevent electrical problems.
   

Conclusion
The JD 700J LT is a versatile and powerful dozer, known for its high push capacity, precision, and ability to operate in difficult conditions. While it is a reliable machine, operators should be mindful of common issues such as hydraulic problems, transmission issues, and track tension. Regular maintenance and prompt attention to any mechanical issues will help keep the machine running smoothly and extend its service life. By following the manufacturer’s recommended maintenance schedule, operators can ensure that the JD 700J LT continues to deliver optimal performance on the job site.