Takeuchi TB138FR Air Conditioning Issue

[MikePhua]

The Takeuchi TB138FR compact excavator is highly regarded for its robust performance and versatility in tight work environments. However, the factory-fitted air conditioning system has been reported to underperform, particularly in warmer climates such as those experienced in many parts of Australia.
Air Conditioning Performance Problem

• Users report that at the start of operation, the air temperature at the cab vents is relatively cool, around 8-9°C.
  
• Within 3 to 4 hours of use, vent temperatures rise to around 16-19°C, with peaks reaching 21°C, which translates to uncomfortably high cab temperatures exceeding 30°C, especially during hot summer months.
  
• This temperature increase impacts operator comfort significantly and can lead to reduced productivity and increased fatigue.
  

Customer Experience

• Despite purchasing the machine new and investing significantly in the unit including hydraulic quick hitch and multiple buckets, operators find the air conditioning system ineffective.
  
• Dealers often claim this is a rare or nonexistent issue, but conversations with other operators suggest the problem is widespread.
  
• Air-conditioning specialists identify that the system is typically undersized for hotter climates and high ambient temperatures.
  

Technical Diagnosis and Solutions

• The existing AC condenser is undersized and located internally in many units, making heat dissipation inefficient under high-temperature operations.
  
• Solutions suggested include replacing major components:
  • Installing a larger, externally mounted condenser with a dedicated remote fan.
    
  • Upgrading to a bigger evaporator to improve refrigerant heat exchange.
    
• These upgrades come with substantial costs (around $5000 AUD or more).
  
• Despite the expense, these modifications significantly improve cooling performance, tailoring the unit to hotter environments.
  

Manufacturer Perspective and Limitations

• Air-con manufacturers reportedly have stated the original system struggles at temperatures above 80°F (26.7°C), limiting its effectiveness.
  
• The design may be more suited to moderate climates, causing challenges in hotter regions.
  
• The issue reflects broader concerns in compact equipment with integrated air conditioning systems, where space and weight constraints limit system size.
  

Key Considerations for Buyers

• Prospective TB138FR buyers in regions with hot climates should test the air conditioning system extensively before purchasing.
  
• Evaluate whether the stock air-con unit will meet comfort needs or require future retrofitting.
  
• Factor potential upgrade costs into purchase and operational budgets.
  

Technical Terms Explained

• Condenser: Component of the AC system where refrigerant releases heat to the outside air.
  
• Evaporator: Part of the AC circuit absorbing heat from the cabin air, cooling it.
  
• Refrigerant: Fluid circulating through the AC system transferring heat.
  
• Remote Fan: Auxiliary fan dedicated to improving airflow over condensers, enhancing cooling.
  
• Cab Temperature: The internal temperature experienced within the operator's cabin.
  

A Real-World Reflection
Operators in Australia's summer months routinely suffer from the undersized air conditioning, prompting some to retrofit larger external condensers and evaporators at significant costs. This has led to growing awareness among Australian owners who share experiences online to caution prospective buyers.
Summary
The Takeuchi TB138FR’s factory-installed air conditioning system frequently struggles in hotter climates, losing cooling effectiveness after several hours of operation. While dealers may downplay the issue, owner feedback reveals a common need for system upgrades involving larger condensers and evaporators. Prospective buyers in warm regions should carefully evaluate the system’s capacity and consider retrofit solutions to ensure operator comfort and productivity in demanding thermal environments.