If you’re searching for “Bobcat T870 DEF delete,” “Bobcat T870 DOC removal,” “Bobcat T870 EGR delete,” or “Bobcat T870 tuning services,” you’ve come to the right place. This in-depth guide will explain what these systems do, the transformative benefits of deleting them, and how TM AG Tuning’s bench tuning process—complete with provided shipping labels—makes it easy to upgrade your machine. Let’s explore how you can optimize your Bobcat T870 for peak performance today.

## Understanding DEF, DOC, and EGR Systems in the Bobcat T870

The Bobcat T870 features a robust Doosan D34 engine, delivering around 100 horsepower while complying with EPA Tier 4 Final regulations. To achieve this, it incorporates advanced aftertreatment systems like DEF, DOC, and EGR. Here’s a breakdown of each component and its role.

### What is Diesel Exhaust Fluid (DEF)?

DEF is a urea-based solution injected into the Selective Catalytic Reduction (SCR) system to reduce nitrogen oxide (NOx) emissions. In the Bobcat T870, DEF is stored in a dedicated tank and sprayed into the exhaust stream, where it reacts with NOx in the SCR catalyst to convert harmful gases into nitrogen and water vapor. This process is essential for emissions compliance but requires regular DEF refills and can trigger derate modes if the fluid level is low or contaminated.

Common issues include DEF crystallization, sensor failures, and quality problems, as seen in troubleshooting cases where bad DEF sensors cause system faults. For T870 operators working in remote or harsh environments, these interruptions can halt productivity.

### What is the Diesel Oxidation Catalyst (DOC)?

The DOC is a catalytic converter-like device that oxidizes carbon monoxide (CO), hydrocarbons (HC), and soluble organic fractions in the diesel exhaust. Positioned upstream in the aftertreatment system of the Bobcat T870, it helps prepare the exhaust for further treatment by the DPF (Diesel Particulate Filter) and SCR. By promoting chemical reactions at high temperatures, the DOC reduces these pollutants before they exit the tailpipe.

However, the DOC can become clogged with soot or fail due to sulfur buildup from low-quality fuel, leading to increased backpressure and reduced engine efficiency. In models like the T870, this often necessitates costly cleaning or replacement, contributing to unplanned maintenance.

### What is Exhaust Gas Recirculation (EGR)?

EGR works by redirecting a portion of the exhaust gases back into the engine’s combustion chamber to lower peak temperatures and reduce NOx formation. In the Bobcat T870, the EGR system includes valves, coolers, and sensors that manage this recirculation. It’s cooled via an EGR cooler to prevent excessive heat, but this introduces soot and contaminants into the intake, potentially causing buildup.

Faults like EGR valve sticking due to carbon deposits are common, triggering error codes such as E523578-02 and leading to limp mode or derated power. EGR can also dilute the air-fuel mixture, impacting overall performance and increasing particulate emissions, which burdens downstream systems like the DOC and DPF.

These systems add complexity to the Bobcat T870’s engine, often resulting in higher operational costs and reliability challenges for off-road applications.

## The Benefits of DEF, DOC, and EGR Delete on Your Bobcat T870

Deleting DEF, DOC, and EGR involves physically removing or bypassing these components and reprogramming the ECU to eliminate related error codes and functions. Here are the key advantages, backed by real-world results from similar Bobcat models.

### 1. Significant Horsepower and Torque Increases

Without the restrictions of EGR recirculation and aftertreatment backpressure from DOC and DEF systems, your Bobcat T870’s engine can operate more freely, leading to substantial power gains. We can also add a +30 horsepower, transforming the T870’s 100 hp Doosan engine into a beast for heavy lifting and grading tasks.

For instance T870 owners report smoother operation and quicker response times, ideal for demanding jobs like forestry or earthmoving.

### 2. Improved Fuel Efficiency and Lower Operating Costs

EGR dilutes combustion, while DOC and DEF systems consume extra fuel during regeneration cycles. Deleting them optimizes fuel delivery, often boosting efficiency by 10-20%.

In the Bobcat T870, eliminating DEF refills alone saves hundreds annually, plus reduced fuel burn from no regens or EGR-induced inefficiencies. Combined with tuning, operators see up to 10% fuel savings, making long workdays more economical.

### 3. Reduced Downtime and Maintenance Expenses

Emissions systems are prone to failures: DEF tanks freeze in cold weather, DOCs clog, and EGR valves accumulate soot, causing faults and shutdowns. Deleting them eliminates these vulnerabilities—no more DEF quality issues, sensor replacements, or forced regenerations that interrupt work.

For the T870, this means fewer trips to the dealer and lower parts costs, with some users avoiding thousands in repairs. Enhanced reliability keeps your machine running in tough conditions.

### 4. Elimination of Limp Mode and Error Codes

Without deletes, faults like poor DEF quality or EGR blockages trigger limp mode, capping power and speed. TM AG Tuning’s ECU reprogramming prevents these, ensuring consistent full-power operation.

### 5. Extended Engine Longevity and Simpler Operation

Removing soot-reintroducing EGR and pressure-building DOC reduces internal wear, potentially extending engine life. Cleaner combustion means less oil contamination and fewer carbon deposits.

Custom tunes can also minimize downtime from emissions-related diagnostics, simplifying overall maintenance.

Note: These modifications are for off-road use only and may void warranties or violate on-road emissions laws.

## The TM AG Tuning Process: Seamless Bench Tuning for Your Bobcat T870

TM AG Tuning makes DEF, DOC, and EGR deletes straightforward with our expert bench tuning service. No need for on-site visits—simply send your ECU, and we’ll handle the rest.

1. **Consultation**: Call us at 1-888-630-7226 or visit tmagtuning.com to discuss your Bobcat T870’s needs, including desired HP gains.

2. **ECU Shipping**: Remove the ECU from your T870 and ship it to us. We provide prepaid shipping labels for hassle-free delivery across North America.

3. **Bench Tuning**: Our technicians reprogram the ECU on the bench to delete DEF, DOC, and EGR functions, add performance tunes, and ensure no check engine lights.

4. **Hardware Guidance**: We’ll advise on physical removals, such as deleting the DEF tank, DOC canister, and EGR components for a complete setup.

5. **Return and Reinstallation**: Receive your tuned ECU back quickly, reinstall it, and enjoy upgraded performance with minimal downtime.

This process is proven for Bobcat models like the T870, with lifetime warranties on tunes.

## Why Choose TM AG Tuning for Your Bobcat T870 Delete?

Located in Medicine Hat, Alberta, TM AG Tuning has tuned thousands of agricultural and construction machines, including Bobcats, with expertise in DEF, DOC, and EGR deletes. Our services deliver real results we’re trusted for reliability.

Don’t let emissions systems limit your Bobcat T870. Contact TM AG Tuning today for a free quote on DEF, DOC, and EGR delete services, and experience unmatched power and efficiency!

The post Bobcat T870 DEF, DOC, and EGR Delete: Unlock Maximum Power and Efficiency with TM AG Tuning appeared first on TM AG Tuning.