The 0445025079 common rail oil pump (often referred to as a high‑pressure fuel injection pump in common rail systems – the term “oil pump” may indicate its use in certain industrial applications or as a direct translation) is a precision‑engineered component, fully compatible with Bosch CP3 or CP4 architecture. This pump is specifically calibrated for a range of diesel engines used in agricultural tractors, construction machinery, industrial generators, and commercial vehicles.
Supplied as a direct OE replacement, the 0445025079 delivers stable rail pressure up to 1,800 bar, ensuring efficient combustion, low emissions, and reliable performance under demanding off‑highway conditions. Rsolid Engine Parts offers this pump as a brand‑new, Bosch‑compatible unit – 100% calibration tested, and backed by a full 12‑month warranty at highly competitive prices.
1. Structural Advantages of the Bosch 0445025079 Pump
The 0445025079 is a high‑pressure common rail pump (Bosch CP3 or CP4 series), designed for durability and precision in industrial and heavy‑duty diesel engines:
Radial Piston Design (3 or 2 plungers) – Depending on the application, the pump uses either three (CP3) or two (CP4) plungers arranged radially around an eccentric cam. This delivers smooth, high‑volume fuel flow with minimal pressure pulsation, reducing stress on the common rail and injectors.
Integrated Vane‑Type Transfer Pump – A built‑in low‑pressure vane pump draws fuel from the tank and supplies the high‑pressure plungers, ensuring consistent inlet pressure even when the lift pump is weak – critical for ageing engines.
High‑Pressure Capability (Up to 1,800 bar) – Generates rail pressures up to 1,800 bar (26,100 psi), enabling superior fuel atomisation for complete combustion, lower soot formation, and improved fuel economy.
Heavy‑Duty Drive Shaft & Bearings – Designed to withstand high torsional loads and vibration typical of 4‑cylinder and 6‑cylinder industrial diesels, ensuring long service life in off‑highway applications.
High‑Pressure Fuel Lubrication – All moving internal parts (plungers, roller shoes, eccentric cam) are lubricated solely by diesel fuel, eliminating external oil lines and simplifying installation.
Integrated Flow Control Valve (ZME) – An inlet metering solenoid valve precisely regulates fuel entry based on ECU demand, providing accurate rail pressure control, improved throttle response, and lower fuel consumption.
Robust Cast Housing with Anti‑Corrosion Coating – The pump body is manufactured from high‑strength materials (cast iron or aluminium) with a protective coating, engineered to withstand vibration, thermal cycling, dust, and moisture.
Direct Bosch Compatibility – Identical mounting flange (SAE standard), drive gear interface, high‑pressure outlet ports, and electrical connector as the original Bosch 0445025079. True plug‑and‑play replacement with no modifications.
2. Compatible Engine & Equipment Models (≤5)
The 0445025079 pump is used in a variety of diesel engines, particularly 4‑cylinder and 6‑cylinder common rail engines from manufacturers such as Deutz, Perkins, Cummins, John Deere, or Chinese brands (Weichai, Yuchai, Xichai). Typical applications include:
Agricultural tractors – Models from John Deere 5 Series, New Holland T5/T6, Massey Ferguson 4700 Series, and Fendt 300/400 Series that use Bosch CP3/CP4 pumps (verify fitment).
Construction machinery – Excavators, wheel loaders, and bulldozers from Caterpillar, Komatsu, Hitachi, XCMG, Sany, Liugong with compatible common rail engines.
Industrial generators – Diesel gensets from Caterpillar, Cummins Power Generation, SDMO, Atlas Copco equipped with 4‑ or 6‑cylinder common rail engines.
Material handling – Forklifts and telehandlers from JCB, Manitou, Merlo, Toyota, Linde using the 0445025079 pump.
Commercial vehicles – Some medium‑duty trucks from Foton, Dongfeng, Shacman, Tata with Bosch common rail systems.
✅ Important Fitment Note – Before ordering, always verify the Bosch number on your original pump (stamped on the nameplate). The 0445025079 may also cross‑reference with numbers such as 0445025078, 0445025080, or OEM part numbers from your engine manufacturer. Contact us with your engine model and serial number for fitment confirmation.
3. Common Failures & Professional Installation/Replacement Advice
3.1 Typical Symptoms of a Failing 0445025079 Pump
Loss of power under load – The engine struggles under heavy load, often accompanied by black exhaust smoke.
Extended cranking time before start – The engine takes longer to start, especially after overnight parking.
Engine surging or rough idle – Inconsistent fuel delivery at low RPM, causing hunting or misfiring.
DTC codes P0087, P0088, or P0191 – Rail pressure too low, too high, or fuel pressure sensor rationality.
Metal particles in the fuel filter – A clear sign of CP3/CP4 internal wear (plunger scuffing or roller bearing failure). Even small ferrous particles indicate imminent pump failure.
External fuel leakage – Visible diesel around the pump body, particularly at the drive shaft seal or around the ZME metering valve.
Diesel contamination in engine oil – A failed drive shaft seal allows fuel to enter the timing case and then the engine oil sump. Check for rising oil level and a diesel smell.
3.2 Professional Installation & Replacement Recommendations
Perform a complete fuel system diagnosis – Before pump replacement, use a compatible diagnostic tool (e.g., Bosch KTS, engine‑specific software) to verify rail pressure values, injector return flow rates, and identify related faults.
Replace the fuel metering valve (ZME) – If the old pump has failed internally, it is strongly recommended to replace the ZME solenoid valve with a new one at the same time. A faulty ZME can cause repeat pump failure.
Replace all fuel filters – Install new primary (water separator) and secondary fuel filters before running the new pump. The CP3/CP4 is highly sensitive to contamination.
Flush the entire fuel system – Drain and clean the fuel tank. Blow out all supply and return lines with compressed air. Replace any rubber hoses that show degradation. This step is non‑negotiable – debris from a failed pump will destroy a new unit within minutes.
Inspect and flow‑test all injectors – Worn or stuck injectors with high return flow will prevent correct rail pressure and cause repeat pump failure. Have all injectors professionally tested and cleaned or replaced as necessary.
Replace the engine oil and filter – If diesel has contaminated the oil, change the oil and filter BEFORE running the new pump.
Prime the low‑pressure circuit – Use a hand vacuum pump on the fuel return line to pull bubble‑free fuel through the pump and filters. Never dry‑crank the pump – CP3/CP4 pumps are sensitive to aeration.
Fill the pump with clean diesel – Remove the high‑pressure outlet fitting and pour clean, lubricious diesel (or Bosch special assembly lubricant) into the pump housing to prevent dry start scoring.
Torque all connections to specification – High‑pressure outlet (M14×1.5 cone seal): 35–45 Nm. Low‑pressure inlet (M16×1.5): 25 Nm. High‑pressure line union nuts: 35–40 Nm. Drive shaft nut: consult the engine workshop manual (typically 100–130 Nm). Use a calibrated torque wrench.
Reset fuel adaptations – After installation, use a diagnostic tool to clear learned fuel trim values and perform a “high‑pressure pump adaptation” or “fuel system learn” routine.
Perform a leak test – Idle the engine for 10 minutes, then inspect all high‑pressure and low‑pressure unions, the pump mounting area, and the drive shaft seal for any signs of fuel wetness.
Monitor rail pressure – Using live data on your diagnostic tool, verify that actual rail pressure tracks within ±20 bar of specified value across all RPM ranges.
💡 Pro Tip – Always use high‑quality diesel with proper lubricity and drain water separators daily. For engines operating in dusty or wet environments, consider installing an additional 5‑micron secondary fuel filter to extend pump and injector life.
4. Why Choose Rsolid Engine Parts as Your Supplier
✅ Exact Bosch Compatibility – Direct replacement for 0445025079 in a wide range of industrial and commercial diesel engines. No modifications required.
✅ 100% Calibration Tested – Each pump is run on a Bosch EPS 200 or equivalent test bench to verify delivery volume, rail pressure stability, ZME regulator response, and leak‑free operation. Test reports available.
✅ 12‑Month Warranty – Full coverage against manufacturing defects for all pumps supplied, even for off‑highway and high‑hour applications.
✅ Competitive Pricing for Workshops & Fleets – Volume discounts available for repair shops, equipment dealers, rental fleets, and parts distributors.
✅ Fast Worldwide Shipping – Stock held in multiple warehouses for rapid dispatch to Europe, Asia, Africa, the Americas, and the Middle East.
✅ Expert Technical Support – Our diesel injection specialists provide pre‑purchase fitment verification, diagnostic assistance, and detailed installation guidance via WhatsApp or email.
Contact Rsolid Engine Parts Today
📞 WhatsApp: +8615975376778
📧 Email: amy@rinjector.com
