Bosch 0445020203 High-Pressure Pump – CP3 Power For MAN D0836 Medium Trucks & City Buses

Behind every efficient MAN mid-range diesel there's one "muscle" component doing the heavy lifting: the high-pressure pump. The part marked 0445020203 (Bosch 0 445 020 203) is a CP3 common-rail high-pressure pump purpose-built for MAN D0836 6.9L engines in TGM trucks, TGL models and Lion's City / urban bus platforms. 

If you run MAN distribution trucks or low-floor buses and the original pump is tired, this is the OE-pattern replacement that restores stabile rail pressure and clean, predictable torque.

 

 

Make it easy for parts buyers and workshop visitors to match the correct unit:

Bosch numbers:

0445020203

0 445 020 203 (often shown on the aluminium ID plate) 

System designation: CR/CP3S3/L110/30-789S – CP3 three-piston common-rail pump.  

MAN OE references:

51.11103-7848

51111037848

plus related numbers 51111037716 / 51111037763 / 51111037787 on some catalogs.  

Aftermarket equivalents: DT Spare Parts 3.21223 (replacing Bosch 0 445 020 203) 

If the tag on your old pump shows 0445020203 or any of the OE codes above, you're looking at the right product.

 

 

The 0445020203 CP3 pump is factory-matched to a wide spread of MAN medium-duty engines and chassis, including:  

MAN TGM 15-, 18-, 22- and 26-ton trucks (TGM 15.280, 18.240, 18.280, 18.330, 22.240, 26.280, etc.)

Selected MAN TGL 4x2 / 4x4 distribution trucks with D0834 / D0836 CR engines

MAN Lion's City / NM / SÜ city and intercity buses with D0836 LOH / LFL engines

Some suppliers also list it as interchangeable with 0445020034 and 0445020060 on MAN D0836 LFL4 engines – always confirm against your VIN or engine code.

 

In a common-rail system the pump is not "timing" injection; it is the pressure generator feeding a shared rail. The CP3 unit:

Draws low-pressure diesel from the feed pump

Compresses it via three radial pistons to well over 1,500 bar

Supplies a stable, finely controlled pressure to the rail so the ECU can fire multiple injector events per stroke

If the pump can't keep up, you'll see:

Hard starting or no-start when hot

Rail-pressure deviation codes and limp-home mode

Flat acceleration, especially in higher gears

Increased fuel consumption and smoke

A healthy 0445020203 Bosch CP3 brings rail pressure back into the target window, so injectors can do their job properly.

 

 

Professional listings for this pump emphasise several technical points:  

CP3S3 architecture – robust three-piston design widely used in heavy-duty and off-highway engines

Precision-ground internal cam ring & pistons for long life at high pressure

Common-rail (CR) fuel mixture formation, diesel only

Mass around 7.5–8.5 kg, compact housing optimised for MAN D0836 front-gear mounting

Quality suppliers offer the pump as either:

Brand-new Bosch unit in sealed packaging, or

Professionally remanufactured pump stripped, re-equipped with new wear parts and calibrated on a test bench, backed by 6–12 month warranty.  

You can summarise it stylishly on your product page:

"Bosch CP3 high-pressure diesel pump 0445020203, OEM for MAN D0836 common-rail engines – new or OE-spec reman, fully calibrated and ready to install."

 

 

✔ Stable city-cycle operation
Stop-start urban duty is brutal on fuel systems. A fresh CP3 keeps pressure control crisp, so buses pull away smoothly and meet timetable without clouds of smoke.

✔ Predictable fuel figures
When rail pressure follows ECU demand precisely, injection duration stays tight – fleets see more consistent L/100 km across similar vehicles.

✔ Protection for injectors & aftertreatment
Erratic pressure stresses injector needles and can overload DPF/NOx systems with soot and unburned fuel. A correct 0445020203 pump stabilises the whole combustion process.

✔ Lower risk of roadside failures
Early replacement of a noisy or high-hour pump is far cheaper than recovering a loaded TGM or full Lion's City bus stuck with a no-start.

 

 

 

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