MAN trucks are renowned for their durability, fuel efficiency, and high performance in long‑haul, construction, and distribution operations. The 0445020201 common rail pump (often referred to as a high‑pressure oil pump in some technical manuals) is a precision‑engineered component, fully compatible with Bosch CP3 architecture. This pump is specifically calibrated for MAN D08, D20, and D26 series diesel engines – the heart of many MAN TGX, TGS, TGL, and TGM trucks.
Delivering stable rail pressure up to 1,800 bar, the 0445020201 ensures efficient combustion, low emissions, and reliable cold starts – even under the most demanding driving conditions. Rsolid Engine Parts supplies this pump as a brand‑new, Bosch‑compatible unit – 100% calibration tested, and backed by a full 12‑month warranty at competitive fleet pricing.
1. Structural Advantages of the Bosch 0445020201 Pump
The 0445020201 belongs to the Bosch CP3S3 family (type formula CR/CP3S3/R70‑S), one of the most robust high‑pressure pump designs in the heavy‑duty truck industry. Its engineering delivers several key benefits for MAN engines:
Three‑Plunger Radial Piston Design – Unlike two‑plunger CP4 pumps, the CP3 uses three radial plungers arranged around an eccentric cam ring. This delivers exceptionally smooth, high‑volume fuel flow with minimal pressure ripple, reducing mechanical stress on the common rail, injectors, and high‑pressure lines – critical for the high mileage of MAN trucks.
Integrated Vane‑Type Transfer Pump – A built‑in low‑pressure vane pump draws fuel directly from the tank and supplies the high‑pressure plungers, ensuring consistent feed pressure even when the chassis lift pump is weak. This eliminates a common failure point found in external lift pumps.
High‑Pressure Capability (1,800 bar) – The pump generates rail pressures up to 1,800 bar (26,100 psi), enabling superior fuel atomisation for complete combustion, lower particulate emissions, and improved fuel economy – essential for Euro 4, Euro 5, and Euro 6 compliance.
Heavy‑Duty Drive Shaft & Bearings – Designed to withstand the high torsional loads and vibration of MAN’s 6‑cylinder and 4‑cylinder engines, ensuring long service life in both on‑highway and vocational 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 Digital Flow Control Valve (ZME) – An inlet metering solenoid valve precisely regulates the amount of fuel entering the high‑pressure section based on ECU demand. This provides accurate rail pressure control, improved throttle response, and lower fuel consumption.
Robust Cast Iron Housing – The pump body is manufactured from high‑strength cast iron with an anti‑corrosion coating, engineered to withstand vibration, thermal cycling, road salt, and moisture encountered in long‑haul and off‑road operations.
Direct Bosch CP3S3 Compatibility – Identical mounting flange (3‑bolt SAE A), drive gear interface, high‑pressure outlet ports, and electrical connector as the original Bosch 0445020201. Plug‑and‑play replacement with no modifications.
Genuine Cross‑References – The 0445020201 is also listed under MAN OEM numbers such as 51.12501‑7122 and 51.12501‑7123, making it easy to verify fitment against your original part.
2. Compatible MAN Truck Models (≤5)
The 0445020201 pump is specifically calibrated for MAN D08, D20, and D26 common rail diesel engines (Euro 4, Euro 5, and early Euro 6). Compatible MAN truck series include:
MAN TGX – Heavy‑duty long‑haul trucks, model years approximately 2007–2015, with D20 (10.5L) or D26 (12.4L) 6‑cylinder engines. Common variants: TGX 18.440, TGX 26.480, TGX 28.480.
MAN TGS – Heavy‑duty construction and off‑road trucks, same engine families as TGX, including TGS 33.480, TGS 35.480.
MAN TGL – Light‑duty distribution trucks (7.5–12 tonnes), with D08 4‑cylinder or 6‑cylinder engines (4.6L or 6.9L). Common variants: TGL 8.180, TGL 12.250.
MAN TGM – Medium‑duty trucks (12–26 tonnes), with D08 6‑cylinder engines. Variants: TGM 15.290, TGM 18.320.
MAN TGA – Older series, but many Euro 4 / Euro 5 variants (2006–2010) also use the 0445020201 pump – verify with your original pump number.
✅ Important Fitment Note – Always check the Bosch number on your original pump (stamped on the nameplate) and confirm your engine code (D0834, D0836, D2066, D2676). If your pump number differs, consult us before ordering. Cross‑references include 51.12501‑7122 and 51.12501‑7123.
3. Common Failures & Professional Installation/Replacement Advice
3.1 Typical Symptoms of a Failing 0445020201 Pump
Loss of power under heavy load – The truck struggles to climb grades or accelerate when fully loaded, often accompanied by black exhaust smoke.
Extended cranking time before start – Rail pressure builds slowly, especially after the truck sits overnight or for several days.
Engine surging or rough idle – Inconsistent fuel delivery at low RPM, causing hunting or misfiring during stationary operation.
DTC codes P0087, P0088, or P0191 – Fuel rail pressure too low, too high, or fuel pressure sensor rationality. Use MAN Cat (MAN Diagnostics) or Bosch KTS to confirm.
Metal particles in the fuel filter – A clear sign of CP3 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.
Fuel in the engine oil – A failed drive shaft seal allows diesel to contaminate the crankcase, leading to rising oil level and risk of engine damage – a known issue on high‑mileage MAN CP3 pumps.
3.2 Professional Installation & Replacement Recommendations
Perform a complete fuel system diagnosis – Use MAN Cat, Bosch KTS, or a compatible diagnostic tool to read fault codes, monitor rail pressure, and measure injector return flow rates. Identify any injectors with excessive return flow.
Replace the fuel metering valve (ZME) – If the old pump has failed internally, it is strongly recommended to replace the ZME solenoid valve (Bosch part number typically 0928400640 or similar) with a new one. A faulty ZME can cause repeat pump failure.
Replace all fuel filters – Install new MAN OEM or high‑quality secondary and primary (water separator) fuel filters before running the new pump. The CP3 is 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 CP3 within minutes.
Inspect and flow‑test all injectors – High return flow from worn injectors will prevent correct rail pressure and cause repeat pump failure. Have all injectors professionally cleaned or replaced. For MAN D20/D26 engines, injectors should be tested on a Bosch EPS bench.
Replace the engine oil and filter – If diesel has contaminated the oil (rising level or diesel smell), 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. CP3 pumps are self‑priming but dry cranking will score the plungers.
Fill the pump with clean diesel – Remove the high‑pressure outlet fitting and pour clean, lubricious diesel (or Bosch assembly lubricant) into the pump housing to prevent dry start scoring.
Torque all connections to specification – High‑pressure outlet (M14×1.5 cone seal): 40–45 Nm. Low‑pressure inlet (M16×1.5): 25 Nm. High‑pressure line union nuts: 35–40 Nm. Drive shaft nut: consult MAN workshop manual (typically 100–120 Nm). Use a calibrated torque wrench.
Reset fuel adaptations – After installation, use MAN Cat 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. Pay special attention to the high‑pressure line connections.
Monitor rail pressure – Using live data on MAN Cat, verify that actual rail pressure tracks within ±20 bar of specified value across all RPM ranges. Perform a road test under load.
💡 Pro Tip – MAN CP3 pumps are generally reliable, but water contamination is their enemy. Always drain the water separator daily. For fleets operating in dusty or humid climates, consider installing an additional 5‑micron fuel filter and using a fuel additive with lubricity enhancer.
4. Why Choose Rsolid Engine Parts as Your Supplier
✅ Exact Bosch CP3 Compatibility – Direct replacement for 0445020201 in MAN TGX, TGS, TGL, TGM, and TGA trucks with D08, D20, D26 engines. No modifications required.
✅ 100% Calibration Tested – Each pump is run on a Bosch EPS 200 test bench to verify delivery volume, rail pressure stability (1,800 bar), ZME regulator response, and leak‑free operation. Test reports available.
✅ 12‑Month Warranty – Full coverage against manufacturing defects for all pumps supplied, even for high‑mileage fleet use.
✅ Competitive Fleet & Workshop Pricing – Volume discounts for transport companies, repair shops, and parts distributors.
✅ Fast Worldwide Shipping – Stock ready to ship to Europe, Asia, Africa, the Middle East, and the Americas.
✅ Expert Technical Support – Our diesel 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
