Product Features

• Structure: Made of galvanized steel pipe with welded construction. One end has a threaded fitting to connect to the injector return port, and the other has a spherical fitting to connect to the return oil manifold. The pipe is bent to a specific shape to fit the engine layout.

• Performance: Offers excellent corrosion resistance and vibration resistance, capable of sustaining continuous low-pressure fuel return flow without leaks or blockages.

• Design: Manufactured to original factory dimensions for 100% interchangeability with OEM parts. It fits seamlessly into the fuel system of D6114/D9 series engines in XCMG LW500 loaders, requiring no additional adjustments during installation.

Core Function

1. Fuel Return: Transfers low-pressure residual fuel from injectors back to the fuel tank, preventing fuel accumulation or airlocks in the lines.

2. Pressure Balance: Maintains stable pressure within the fuel injection system, ensuring precise injector operation.

3. Heat Dissipation: Removes excess heat from injectors via continuous fuel flow, helping to extend component service life.

Return Oil Pipe Welding Assembly D26-030-02A+F SHANGCHAI – Premium Engine Fuel Return Line

When your SHANGCHAI D-series engine demands a reliable fuel return path, the Return Oil Pipe Welding Assembly D26-030-02A+F delivers precision-engineered performance that keeps diesel flowing back to the tank without leaks, pressure drops, or premature fatigue. Sourced directly from METTLEAD Truck Parts’ quality-controlled production line in China, this welding assembly meets OEM dimensional and material standards — giving your fleet the uptime it deserves at a factory-direct price.

This fuel return pipe assembly serves as the critical conduit that channels excess diesel from the high-pressure fuel system back to the fuel tank. A compromised return line leads to air ingestion, unstable rail pressure, and eventual injector damage. The D26-030-02A+F eliminates those risks with factory-welded joints, corrosion-resistant tubing, and exact-fit geometry for SHANGCHAI D-series powertrains.

Key Features and Buyer Benefits

• OEM-Matched Specification: Manufactured to the exact dimensional tolerances of the original SHANGCHAI D26-030-02A+F part number, ensuring bolt-on fitment with zero modification.
• Precision Welding Integrity: Each joint undergoes automated TIG welding followed by pressure-leak testing at 1.5× operating pressure, so you receive an assembly that won’t weep under thermal cycling.
• Corrosion-Resistant Material: High-grade carbon steel tubing with anti-rust surface treatment withstands diesel exposure, road salt, and underbody moisture across tropical and cold-climate operations.
• Vibration Dampening Design: Engineered bend radii and mounting points absorb engine vibration, preventing stress fractures that plague inferior aftermarket copies.
• Factory-Direct Pricing: By eliminating middlemen, METTLEAD passes cost savings directly to procurement managers — typically 30–45% below dealer-channel pricing.
• Strict Quality Control: 100% dimensional inspection and weld-integrity verification before packaging. Every batch is traceable to raw material lot numbers.
• White-Label & Custom Packaging Available: Distributors and fleet operators can request branded packaging or neutral export cartons to suit their market requirements.

Technical Specifications

Application Scenarios and Compatible Vehicles

The Return Oil Pipe Welding Assembly D26-030-02A+F is engineered for SHANGCHAI-powered commercial vehicles and industrial equipment commonly deployed across Africa, Southeast Asia, the Middle East, and CIS markets. Typical application scenarios include:

• Heavy-Duty Trucks: SANY, XCMG, and LIUGONG mining dump trucks equipped with SHANGCHAI D12/D26 engines operating in high-altitude, high-dust environments.
• Construction Machinery: Wheel loaders, excavators, and bulldozers running SHANGCHAI powertrains where vibration intensity demands superior weld quality.
• Bus & Coach Fleets: Urban and intercity buses powered by SHANGCHAI D-series engines requiring scheduled fuel system maintenance.
• Generator Sets: Stationary and mobile gensets using SHANGCHAI diesel engines in continuous or standby power applications.
• Marine Auxiliary Engines: Inland waterway vessels with SHANGCHAI propulsion systems operating in humid, salt-air conditions.

Whether your fleet runs long-haul logistics across sub-Saharan corridors or powers a quarry operation in Southeast Asia, this return oil pipe assembly maintains fuel system integrity under the harshest duty cycles.

OEM/ODM Capability

METTLEAD Truck Parts operates as both a manufacturer and a flexible supply partner for distributors, fleet operators, and engine rebuilders worldwide. Our OEM/ODM services for fuel system components include:

• Custom Part Development: Provide your drawing or sample, and our engineering team will reverse-engineer, prototype, and validate a production-ready return pipe assembly within 15–20 working days.
• White-Label Packaging: Your brand, your barcode, your market. We produce under your label with full confidentiality agreements in place.
• Material Upgrades: Need stainless steel tubing for marine applications or higher-grade coatings for extreme environments? We accommodate material specification changes per order.
• Volume Scalability: From sample orders of 5 pieces to container-load quantities of 10,000+ units, our production line scales without compromising inspection standards.
• Factory Audit Welcome: Procurement teams are invited to visit our facility for on-site quality audits, production line inspections, and face-to-face technical discussions.

Explore our full range of SHANGCHAI engine parts to consolidate your sourcing under one reliable supplier.

Frequently Asked Questions

What is the function of the Return Oil Pipe Welding Assembly D26-030-02A+F in the fuel system?

This assembly channels surplus diesel fuel from the injectors and high-pressure pump back to the fuel tank. It maintains stable fuel rail pressure, prevents air pockets from forming in the return circuit, and ensures the fuel system operates within its designed thermal and pressure parameters. A failed return pipe can cause rough idling, power loss, and accelerated injector wear.

How do I confirm that D26-030-02A+F fits my specific SHANGCHAI engine model?

Cross-reference the part number D26-030-02A+F against your engine’s original parts catalog or nameplate data. If you are unsure, send us your engine model number, serial number, and a photo of the existing return pipe — our technical team will verify compatibility within 24 hours.

What causes a return oil pipe welding assembly to fail?

The most common failure modes are vibration-induced weld cracking, external corrosion from road chemicals or moisture, and internal erosion from contaminated fuel. Inferior aftermarket parts often fail at weld joints due to poor penetration or incorrect filler material. The D26-030-02A+F uses automated TIG welding with controlled parameters to eliminate these weak points.

Is this return oil pipe assembly pressure-tested before shipment?

Yes. Every unit undergoes hydrostatic pressure testing at 0.75 MPa — 1.5 times the maximum operating pressure — to verify weld integrity and seal performance. Units that show any pressure decay are rejected and scrapped. Test certificates are available upon request for bulk orders.

Can I order a small quantity for testing before committing to volume?

Absolutely. We support sample orders so you can validate fitment, material quality, and weld integrity in your own workshop before scaling up. Sample lead time is typically 3–7 working days depending on stock availability.

What is the typical lead time for bulk orders of the D26-030-02A+F?

Standard production lead time for bulk orders ranges from 15 to 25 working days, depending on quantity and any custom packaging requirements. Stock items ship within 3–5 working days. We provide real-time production updates for orders exceeding 500 units.

Ready to Secure Your Supply of Return Oil Pipe Welding Assembly D26-030-02A+F?

Every day without a reliable parts supplier is a day your fleet risks unplanned downtime. METTLEAD Truck Parts combines factory-direct pricing, rigorous quality control, and flexible logistics to keep your SHANGCHAI engines running at peak efficiency.

Take the next step:

• Request a competitive quotation with volume-tiered pricing
• Ask for a free sample to validate quality in your workshop
• Discuss custom packaging or white-label requirements
• Schedule a factory visit to audit our production capabilities

Contact us now
with your required quantity, destination port, and any technical questions. Our export team responds within 12 hours — because your procurement timeline matters.