Common Rail Oil Tank Assembly

The 6261-71-1220 Common Rail Oil Tank Assembly is the factory-matched high-pressure fuel rail built specifically for Komatsu heavy-duty construction equipment. It serves as the central pressure-stabilizing component of the engine's Denso common rail fuel system, tasked with storing pressurized diesel and evenly distributing fuel to each cylinder's fuel injector. Every thread, sensor port and mounting point on this Common Rail Oil Tank Assembly adheres to original equipment dimensional standards, allowing mechanics to swap out the worn factory rail without altering fuel lines, wiring or engine brackets. For fleets running Komatsu large mining machines, this complete rail assembly fixes recurring faults like fluctuating fuel pressure, unstable engine idle and random power loss during heavy digging or loading.

 Consistent Pressure Output For Long Shifts

The thickened one-piece aluminum rail body minimizes internal volume deformation under sustained 1300bar working pressure. The factory-fitted Denso pressure sensor feeds real-time pressure readings to the engine ECU, holding fuel pressure steady even during 10+ hour non-stop mining shifts. This directly eliminates rough engine shake and sudden power drop-offs caused by pressure leakage from aged original rails.

 True Plug-and-Play OEM Replacement

Every threaded port, sensor mounting thread and fixing hole is machined to match the original rail's blueprint dimensions. Field mechanics report the full assembly can be swapped in under 40 minutes; no fuel pipe cutting, wiring harness reworking or custom spacers are required to fit it onto PC400-8, WA480-8 and other compatible machines.

 Pre-Assembled Complete Kit, No Separate Parts Matching

Unlike generic aftermarket rails sold as bare housings, this Common Rail Oil Tank Assembly comes fully pre-assembled from production: Denso pressure sensor, overpressure relief valve, six injector connectors and dust caps are all pre-installed. Repair shops do not need to source and fit individual components separately, cutting assembly matching errors and spare parts inventory costs.

 Corrosion Resistance For Harsh Job Sites

The rail body undergoes shot blasting to remove casting burrs and form a uniform anti-rust outer layer. Internal fuel flow channels are precision polished to cut carbon and diesel residue buildup, which is the top cause of rail blockage and injector failure on mine-site equipment exposed to low-quality fuel.

 Built-In Overpressure Safety Protection

The embedded limiting relief valve triggers automatically once internal fuel pressure exceeds 1600 bar, bleeding excess pressure back to the fuel tank. This protective design prevents costly damage to high-value downstream parts including fuel injectors and the high-pressure fuel pump when fuel system surges occur.

This common rail assembly is designed exclusively for heavy Komatsu construction machines working in high-load industrial environments: open-pit mine stripping, large-scale earthmoving projects, quarry rock loading and continuous heavy hauling operations. As the core fuel pressure stabilizing component, the Common Rail Oil Tank Assembly maintains reliable, consistent engine power output in dusty, humid and high-load mining conditions.