Caterpillar 336EL vs. 336FL: A Comparative Look at Two Heavyweights

[MikePhua]

The Caterpillar 336 series excavators represent a significant evolution in hydraulic excavator technology, fuel efficiency, and operator comfort. Among the most debated comparisons in this lineup are the 2014 Cat 336EL and the newer Cat 336FL. While they share much in terms of core design and purpose, each machine reflects a different stage in Caterpillar's response to changing emissions regulations, operator demands, and technological advancement.
Engine and Emissions Compliance
The most noticeable difference between the two machines lies in their engine and emissions technology.

• 336EL is powered by a Caterpillar C9.3 ACERT engine compliant with Tier 4 Interim (also known as Tier 4i) standards.
  
• 336FL is equipped with the same C9.3 engine but tuned for Tier 4 Final compliance, incorporating additional after-treatment systems such as DEF (Diesel Exhaust Fluid) injection for NOx control.
  

Terminology Note:

• Tier 4 Final: A U.S. EPA standard requiring ultra-low emissions of particulate matter (PM) and nitrogen oxides (NOx). Machines meeting this standard often require DEF.
  
• ACERT: Advanced Combustion Emissions Reduction Technology, Caterpillar’s proprietary method for controlling engine emissions.
  

While both engines provide similar horsepower (in the ballpark of 300 hp), the 336FL tends to be slightly more efficient in fuel consumption due to improved hydraulics and engine tuning, especially during light-to-medium-duty applications.
Hydraulics and Fuel Efficiency
The FL introduces Cat's updated SmartBoom technology, allowing smoother movement during lifting, reducing fuel burn by minimizing hydraulic flow waste. Operators have reported that the FL is 5–10% more fuel efficient in real-world scenarios. The EL, though robust and reliable, lacks some of the fine control enhancements introduced in the newer model.
Operator Experience and Cab Design
Both machines feature the Cat Command Control joystick system and spacious cabs, but the FL version edges ahead with improved insulation, better HVAC efficiency, and slightly upgraded ergonomics. Some operators report less fatigue after long hours in the FL cab compared to the EL.
Real-world story: A civil contractor in Arizona switched from a fleet of 336ELs to 336FLs and noted not only a noticeable drop in fuel usage but also fewer complaints from operators about heat retention in the cab—a key factor under extreme desert conditions.
Maintenance and Serviceability
Interestingly, some mechanics prefer the EL due to its simpler after-treatment system. While the FL uses DEF injection and a larger DPF (Diesel Particulate Filter) that can require additional servicing or troubleshooting, the EL has fewer electronic and emission components to worry about.
However, the FL counters this with longer service intervals on filters and DEF tanks, and it includes a more advanced onboard diagnostic system that helps identify issues faster.
Terminology Note:

• DPF: Diesel Particulate Filter, used to trap soot from exhaust gases.
  
• DEF: Diesel Exhaust Fluid, used in Selective Catalytic Reduction (SCR) to convert NOx to nitrogen and water.
  

Resale Value and Market Trends
In terms of resale value:

• The 336FL commands a higher price, primarily due to its newer emissions compliance and efficiency gains.
  
• The 336EL remains attractive to international buyers or those in markets not subject to stringent EPA regulations, as it’s easier to operate in regions without access to DEF or with less stringent fuel standards.
  

For example, in 2023, a U.S. dealer reported that used 336ELs were being exported to South America where Tier 4 Final compliance is not mandatory, and buyers preferred machines with fewer electronics and lower maintenance costs.
Use Case Suitability
When choosing between the two, consider your use case:

• For heavy-duty applications in regulated environments (e.g., highway construction, urban development), the 336FL is better optimized for fuel savings and compliance.
  
• For remote, unregulated, or budget-conscious operations, the 336EL provides simplicity and rugged reliability.
  

Summary of Differences in List Form

• Engine Tier Compliance
  • EL: Tier 4 Interim (no DEF)
    
  • FL: Tier 4 Final (uses DEF)
    
• Fuel Efficiency
  • EL: Baseline efficiency
    
  • FL: 5–10% better with SmartBoom and revised hydraulics
    
• Cab Comfort
  • EL: Comfortable but basic
    
  • FL: Enhanced ergonomics, quieter cabin
    
• Hydraulics
  • EL: Standard
    
  • FL: More responsive, energy-saving systems
    
• Maintenance
  • EL: Simpler, lower-tech servicing
    
  • FL: Longer service intervals but more electronics
    
• Resale
  • EL: Better for non-regulated markets
    
  • FL: Higher value in Tier 4-compliant regions
    

Final Thoughts
Choosing between a 336EL and 336FL is a matter of priorities. If emissions compliance and operator comfort rank highest, the 336FL is the obvious winner. If service simplicity and upfront cost matter more, the 336EL still holds strong appeal. Much like how the trucking world views pre-emission diesels with reverence, some excavation veterans consider the 336EL a "sweet spot" before electronics began dominating machine control systems.
In the words of one seasoned operator:
"The EL was like a good pickup truck—no frills, just power. The FL feels like you're flying a jet—smooth, quiet, and a bit more delicate. Depends what you need."
That quote sums up the decision nicely.