GTB20V Turbo 504359632 504371348 789773-5013 789773-0013 789773-5013S 789773- 5006S 789773-0026 789773-5026 789773-5026S 789773-0006 789773-5006 Turbocharger for Mitsubishi Fuso FB83 Truck 4M420AT1 Engine

GTB20V Turbocharger for Mitsubishi Fuso FB83 Truck 4M420AT1 Engine

Part Number:504359632 504371348 789773-5013 789773-0013 789773-5013S 789773- 5006S 789773-0026 789773-5026 789773-5026S 789773-0006 789773-5006

Product Overview

The GTB20V Turbocharger is a high-efficiency variable geometry turbo (VGT / VNT) engineered for Mitsubishi Fuso FB83 trucks equipped with the 4M420AT1 engine. Designed for commercial transport operations, this turbocharger provides:

• Fast boost response
• Stronger torque at low RPM
• Improved fuel economy
• Reduced turbo lag
• Longer engine life under heavy-duty use

Built with OE-equivalent materials and advanced production processes, this turbocharger ensures reliable performance, perfect fitment, and long-lasting durability for daily delivery trucks, logistics fleets, and commercial transport businesses.

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Key Features & Benefits

Variable Geometry Technology (VGT/VNT)

Delivers rapid boost response, improved low-end torque, and smoother acceleration.

Perfect OE Replacement

Matches part numbers 504359632, 504371348, 789773 series, ensuring 100% compatibility with Mitsubishi Fuso FB83 trucks.

Fuel-Saving Performance

Enhances engine efficiency and reduces diesel usage during long-distance commercial driving.

Heavy-Duty Reliability

Built for trucks running 8–16 hours per day in city and highway environments.

Precision Balanced CHRA

Ensures stability, minimal vibration, and extended turbo lifespan.

Durable High-Temperature Alloy

Designed to withstand extreme heat cycles and frequent boost variations.

Technical Specifications

Who Is This Turbocharger For?

This turbocharger is ideal for:

• Logistics companies
• City delivery fleet operators
• Mitsubishi Fuso truck maintenance shops
• Independent repair workshops
• Engine rebuilders
• Truck dealers & parts distributors
• Commercial vehicle owners needing reliable replacement parts

What Problems Does This Turbo Solve?

This GTB20V turbo helps resolve:

• Loss of acceleration or weak low-end torque
• Excessive fuel consumption
• Slow turbo spool or lag during gear shifts
• Whistling, grinding, or metallic turbo noise
• Excessive smoke (black/white/blue)
• Oil leakage from turbo seals
• Reduced pulling power when carrying heavy loads
• Poor engine performance under uphill or highway conditions

It restores factory-level boost performance, improving reliability and reducing downtime.

Usage Scenarios

Suitable for a wide range of commercial operations:

• City delivery routes
• Long-distance transportation
• High-load cargo operations
• Stop-and-go driving cycles
• Hot and humid climates
• Cold-start winter conditions
• Daily heavy-duty commercial trucking

This turbo is built for constant engine demand and tough working environments.

Installation Guide (Step-by-Step)

1. Disconnect the battery and allow engine to cool.

2. Remove the intake, exhaust, and oil lines from the old turbo.

3. Inspect the oil feed line for carbon blockage; replace if necessary.

4. Clean or replace air filters and intake hoses.

5. Install the new GTB20V turbo using new gaskets and torque specs.

6. Pre-lubricate the turbo by adding clean engine oil into the CHRA.

7. Refill engine oil and replace oil filter.

8. Start the engine and idle for 3–5 minutes—do not rev immediately.

9. Check for oil leaks, air leaks, and actuator operation.

10. Perform a road test to confirm proper boost response.

Maintenance Tips for Maximum Turbo Life

• Replace engine oil every 5,000–8,000 km or per truck manufacturer guideline.

• Replace air filters frequently, especially in dusty routes.

• Ensure no foreign particles enter the intake system.

• Check VGT actuator function regularly.

• Allow engine to idle 1–2 minutes before shutdown after heavy load.

• Inspect hoses, clamps, and exhaust connections periodically.

Proper maintenance ensures long-term turbo reliability.

FAQ – Frequently Asked Questions

Q1: Does this turbo directly replace the OEM Mitsubishi Fuso turbo?

Yes. It fits all part numbers in the 504359632 / 504371348 / 789773 series.

Q2: Do you supply the turbo with actuator?

We offer versions with or without the actuator depending on customer needs.

Q3: Can this turbo improve fuel efficiency?

Yes. VGT technology improves combustion efficiency, reducing fuel costs.

Q4: Do you offer wholesale pricing?

Yes, we support bulk orders, distributor pricing, and OEM customization.

Q5: What are the signs of a failing GTB20V turbo?

• Slow acceleration
• Excessive smoke
• Turbo warning light
• Whistling noise
• Engine overheating
• Oil leaks

About Us – Zhongke Turbocharger Co., Ltd.

Founded in 2001, Fengcheng Zhongke Turbocharger Co., Ltd. is a leading manufacturer specializing in:

• Complete turbochargers
• CHRA cartridges
• VGT actuators
• Repair kits
• Compressor wheels & turbine wheels
• Turbo components for commercial vehicles & heavy machinery

We produce high-quality products compatible with:Mitsubishi Fuso, Isuzu, Hino, Cummins, Garrett, BorgWarner, Toyota, CAT, Komatsu, and many other international brands.

Our Advantages

• Advanced CNC machining
• High-speed dynamic balancing systems
• OE-standard quality control
• Large inventory & fast shipping
• 20+ years global export experience
• Strong R&D and engineering team

We help customers achieve stable supply, reduced downtime, and increased business competitiveness.

Our Team

Our team includes:

• Turbocharger engineers with 25 years experience
• VGT actuator specialists
• CHRA balancing experts
• Quality control professionals
• Agricultural, truck & industrial turbo application experts
• International sales team familiar with global markets

We combine engineering expertise + industry experience to deliver trusted, efficient turbocharger solutions worldwide.