Should You Delete the EGR System on a Bobcat T870

[MikePhua]

The Bobcat T870 and Its Emissions Control System
The Bobcat T870 compact track loader was introduced in the early 2010s as the largest model in Bobcat’s M-Series lineup. With a rated operating capacity of over 3,800 lbs and a powerful turbocharged diesel engine, the T870 was designed for demanding applications in construction, demolition, and land clearing. To meet Tier 4 emissions regulations, the T870 is equipped with an Exhaust Gas Recirculation (EGR) system, along with a Diesel Oxidation Catalyst (DOC) and, in later models, a Diesel Particulate Filter (DPF).
The EGR system reduces nitrogen oxide (NOx) emissions by recirculating a portion of the exhaust gases back into the intake manifold. This lowers combustion temperatures and helps meet environmental standards. However, EGR systems are known to introduce soot and carbon buildup into the intake tract, which can lead to reduced performance, increased maintenance, and premature engine wear.
Why Some Operators Consider EGR Delete
EGR delete refers to the removal or bypassing of the EGR system, typically through hardware modifications and electronic tuning. The goal is to restore full engine performance, reduce intake contamination, and eliminate EGR-related faults.
Potential benefits include:

• Improved throttle response and torque
  
• Lower intake temperatures and cleaner airflow
  
• Reduced frequency of EGR valve cleaning or replacement
  
• Elimination of EGR-related diagnostic trouble codes (DTCs)
  

A contractor in Mississippi reported that his 2014 T870 experienced sluggish performance and frequent EGR valve faults. After an EGR delete and ECU reprogramming, the machine ran smoother and required fewer service intervals.
Risks and Legal Considerations
While EGR delete may improve performance, it comes with significant risks:

• Violation of emissions laws
  In many jurisdictions, tampering with emissions systems is illegal and can result in fines or equipment seizure.
  
• Loss of warranty coverage
  Manufacturers may void engine and emissions warranties if unauthorized modifications are detected.
  
• Inspection failure
  Machines used in regulated environments may fail emissions inspections or be barred from job sites.
  
• Resale complications
  Modified machines may be harder to sell or require restoration to factory condition.
  

In 2021, a fleet operator in Colorado was fined over $50,000 for operating modified equipment on a public works project. The machines had EGR and DPF systems removed, triggering enforcement action after a routine inspection.
Technical Challenges of EGR Delete
Deleting the EGR system on a Bobcat T870 requires:

• Removal or blocking of the EGR valve and cooler
  
• Installation of bypass plates or rerouted coolant lines
  
• ECU tuning to disable EGR-related functions and fault codes
  
• Ensuring compatibility with DOC and DPF systems if present
  

Without proper tuning, the machine may enter limp mode, display persistent warning lights, or experience fuel mapping issues. Some operators attempt DIY deletes using resistor tricks or unplugging sensors, but these methods often lead to unstable performance and long-term damage.
Alternatives to Full EGR Delete
For those seeking reliability without violating regulations:

• EGR cleaning and maintenance
  Regular cleaning of the EGR valve and cooler can restore function and prevent buildup.
  
• Software recalibration
  Some authorized dealers offer performance tuning within legal limits, optimizing fuel and air ratios without disabling emissions systems.
  
• Upgraded filtration
  Installing high-efficiency air filters and fuel additives can reduce soot formation and extend EGR component life.
  

A technician in Ontario implemented a quarterly EGR cleaning schedule and reduced fault codes by 80% across his Bobcat fleet.
Conclusion
While EGR delete on the Bobcat T870 may offer short-term performance gains, it carries legal, technical, and financial risks. Operators should weigh the benefits against potential consequences and consider preventive maintenance or legal tuning alternatives. In modern diesel equipment, emissions systems are deeply integrated into engine management—and removing one part often affects the whole. For those committed to long-term reliability, working with the system may be wiser than working around it.