International TD15C Dozer: A Comprehensive Overview and Troubleshooting Guide

[MikePhua]

The International TD15C is a mid-sized bulldozer that was produced by the International Harvester Company (IHC) in the 1960s and 1970s. Renowned for its strength and durability, the TD15C was designed to perform a wide variety of tasks, such as land clearing, construction work, and mining operations. Despite its age, this bulldozer is still favored by operators for its reliability and simplicity, making it a valuable piece of machinery for certain operations.
Overview of the International TD15C Dozer
International Harvester, known for its agricultural machinery, expanded its portfolio into the construction equipment sector in the mid-20th century. The TD15C was part of their crawler tractor lineup and was targeted towards medium-duty applications. Equipped with a 6-cylinder diesel engine, the TD15C produced around 125 horsepower, making it an effective machine for handling a variety of earthmoving tasks.
The dozer featured a robust design, with a strong undercarriage and a solid frame. It was designed to provide power and stability, even in challenging environments. This dozer’s blade size and hydraulic capabilities allowed it to handle both light and heavy-duty tasks effectively. One of the key features that contributed to the TD15C's durability was its simplicity in design, which made repairs and maintenance relatively easy compared to more complex modern machines.
Technical Specifications

• Engine: The TD15C is powered by a 6-cylinder, 1,800 cubic inch diesel engine. The engine is known for its robustness, providing sufficient power for heavy-duty tasks while offering relatively simple maintenance procedures. The horsepower rating of 125 hp (93 kW) makes the TD15C suitable for mid-level tasks like road construction, mining, and land reclamation.
  
• Transmission: The TD15C uses a powershift transmission, allowing operators to easily shift gears under load, which is essential for efficient operation in varying terrains.
  
• Undercarriage: The undercarriage is an important feature of any crawler dozer. The TD15C’s undercarriage consists of heavy-duty rollers and sprockets, providing long-lasting durability and traction. However, wear and tear are inevitable, especially after extended use, and maintenance is crucial to keep it operational.
  
• Hydraulic System: The dozer is equipped with a hydraulic system designed to power attachments like blades and ripper attachments. The hydraulic system is also responsible for lifting and tilting the blade. As is typical with older machines, regular maintenance is essential to ensure the hydraulic components continue to perform at their best.
  

Common Problems with the International TD15C and Solutions
Like any piece of heavy machinery, the International TD15C can encounter various issues as it ages. Some common problems and troubleshooting steps for the TD15C are outlined below:

1. Engine Starting Problems
   • Symptoms: Difficulty starting the engine, poor idling, or stalling shortly after startup.
     
   • Causes: The issue could stem from a clogged fuel filter, worn-out starter motor, or issues with the fuel pump. Another possibility is a low or improperly charged battery, which is common in machines of this age.
     
   • Solutions: Regularly replace the fuel filter and inspect the starter motor for wear. Check the fuel system for blockages and ensure the battery is in good condition. Ensuring the fuel system is clean and free of impurities will help with smoother starting.
     
2. Transmission Issues
   • Symptoms: Sluggish shifting or difficulty in engaging the gears.
     
   • Causes: One of the most common causes of transmission issues in the TD15C is wear in the clutch or transmission fluid degradation. If the transmission is low on fluid, it may not engage properly, leading to jerky movements or a complete failure to shift.
     
   • Solutions: Check the transmission fluid levels and top up if necessary. Also, inspect the clutch and shifting components for signs of wear. Replace transmission fluid as per the manufacturer’s recommended intervals, and consider getting the transmission serviced if issues persist.
     
3. Hydraulic System Failures
   • Symptoms: Slow or erratic blade movements, failure to lift the blade properly, or no movement at all.
     
   • Causes: Low hydraulic fluid levels, dirty or clogged filters, or worn-out hydraulic pumps can lead to poor system performance. Hydraulic fluid contamination can also be a cause of malfunction.
     
   • Solutions: Regularly check hydraulic fluid levels and ensure the system is free of leaks. Clean or replace the hydraulic filters as necessary, and make sure the pump is functioning correctly. Flushing the hydraulic system periodically and replacing fluids will maintain the hydraulic system's efficiency.
     
4. Undercarriage Wear
   • Symptoms: Uneven track wear, noisy tracks, or slippage while the machine is in motion.
     
   • Causes: Over time, the rollers, sprockets, and tracks can wear down, especially if the machine is frequently used in abrasive environments. Poor track maintenance or underinflated tracks can also lead to excessive wear.
     
   • Solutions: Check the tracks regularly for tension and proper alignment. Inspect the rollers and sprockets for wear and replace them if necessary. Keep the tracks properly tensioned to avoid uneven wear. If you notice excessive wear, consider adding a track adjustment or replacing worn parts.
     
5. Electrical Problems
   • Symptoms: Non-functioning lights, faulty gauges, or the dozer failing to start.
     
   • Causes: Electrical problems in the TD15C can be traced to faulty wiring, damaged fuses, or a weak battery. Over time, wires can become corroded or loose connections can prevent electrical signals from reaching key components.
     
   • Solutions: Inspect the wiring and electrical connections for damage. Replace worn-out wires or fuses, and ensure the battery terminals are clean and secure. Checking the alternator’s charging capacity is also important, as a failing alternator can lead to a weak or dead battery.
     

Maintenance Tips for the International TD15C

1. Regular Fluid Changes
   • Perform regular engine oil changes, transmission fluid checks, and hydraulic fluid replacements. This is essential for maintaining the machine’s performance and preventing premature wear of the components.
     
2. Undercarriage Care
   • The undercarriage requires regular inspection for wear. Adjust track tension and replace components like rollers and sprockets when signs of excessive wear appear.
     
3. Proper Storage
   • Store the machine in a dry, sheltered environment when not in use. This will help protect the metal components from rust and other environmental damage.
     
4. Inspect Filters and Cleanliness
   • Regularly inspect and clean air and fuel filters. Replacing filters as needed ensures the engine and hydraulic systems continue to function efficiently.
     

Conclusion
The International TD15C dozer remains a durable and reliable machine despite its age. Its simple design, combined with regular maintenance, ensures that operators can get many years of productive use out of it. By addressing common issues such as engine performance, transmission problems, and hydraulic system maintenance, you can maximize the efficiency of the TD15C and keep it running smoothly for years. Regular care and attention to key areas will help maintain this iconic piece of machinery, continuing its legacy of reliability in heavy-duty operations.