0445020609 Bosch CP4 Fuel Injection Pump 5302736 for Cummins QSB4.5 and QSB6.7 Engines

Genuine new Bosch 0445020609 CP4 high-pressure fuel injection pump (Cummins OE 5302736 / 5 302 736, also 5529762 and 5289267) for Cummins QSB4.5 and QSB6.7 off-highway diesel engines. Supplied brand new in the original sealed Bosch box, made in Germany, with a 1-year manufacturer global warranty. This Bosch number replaces the earlier Bosch number 0445020615, which is no longer produced.

This is the twin-element CP4 variant, Bosch type formula CR/CP4N2/L93/40-S. It is driven by the engine and raises the fuel to injection pressure, while an electronic inlet metering unit on the pump controls how much fuel is compressed, so the engine control unit holds the commanded rail pressure across the whole load and speed range. The CP4 is lubricated by the diesel it pumps, which is why fuel cleanliness determines its service life.

Also known internationally as: high-pressure fuel injection pump (EN), Hochdruck-Einspritzpumpe (DE), pompe d'injection haute pression (FR), pompa di iniezione ad alta pressione (IT), bomba de inyeccion de alta presion (ES), pompa de injectie de inalta presiune (RO) - Bosch 0445020609 for Cummins QSB4.5 and QSB6.7.

Key features

Product details

OEM cross-reference numbers

Compare the number on your original pump before ordering. The engine model alone is not enough to confirm compatibility: Cummins built the QSB4.5 and QSB6.7 in several power ratings and emission stages, so another code may be the correct one for a particular engine. Identification is made by the number on the fitted pump or by the engine serial number, not by the machine model.

Engine compatibility

The engine applications below come from the Bosch application data for this pump. Compatibility must always be verified by the original pump number, the Cummins OE number or the engine serial number, never by the machine model alone.

The QSB4.5 and QSB6.7 are Cummins off-highway engines used in construction, agricultural, industrial and material-handling equipment as well as in generator and marine installations. Because one machine model can be built with different engine ratings and emission stages, the engine dataplate and the number on the fitted pump are the reliable identifiers.

Technical information

Related diesel fuel system components

Manufacturers used different variants depending on engine build, power rating, emission stage and production date, so another code may be the correct one for your engine. Identify the related part by the number on the fitted component, not by the machine model.

Shipping and warranty

Frequently asked questions

How do I know the Bosch 0445020609 pump fits my Cummins engine? Read the number on the nameplate of the pump fitted to the engine. If it reads 0445020609, 0 445 020 609, 0445020615, or the Cummins numbers 5302736, 5529762 or 5289267, this is the correct pump. If the number is different, send us the pump number together with the engine serial number from the engine dataplate before ordering.

What condition is this pump supplied in? It is a genuine new Bosch pump, supplied in the original sealed Bosch box, made in Germany, with a 1-year manufacturer global warranty. There is no core charge, so no old part has to be returned.

Is my Cummins number 5302736, 5529762 or 5289267 the same pump? Yes. All three Cummins references correspond to this Bosch 0445020609 high-pressure pump for the QSB4.5 and QSB6.7 engines.

What happened to Bosch 0445020615? Bosch discontinued 0445020615 and replaced it with 0445020609. If your records or your old pump show 0445020615, this listing is the current Bosch part for that reference.

Why does the pump nameplate show 5302736000 and not 5302736? The Bosch nameplate on this pump carries the customer reference in the ten-digit form 5302736000, while Cummins parts documentation lists the same reference as 5302736. Both identify the same part, so a pump marked 5302736000 is the correct unit when you are looking for 5302736.

What does the type formula CR/CP4N2/L93/40-S mean? CR stands for common rail, CP4 is the pump generation and N2 identifies the twin-element version, which has two pumping elements instead of the single element of the CP4N1 used on smaller engines. The remaining figures are Bosch internal designations for the plunger and drive configuration of this build.

What causes a CP4 pump to fail? The CP4 is lubricated by the diesel it pumps, so poor fuel quality, water in the fuel, contamination, air ingress or a neglected fuel filter are the usual causes. Running the tank dry is also damaging, because it removes lubrication from the pump.

Can a failed CP4 pump damage the injectors and rail? Yes. When a CP4 fails internally it can release metallic debris (swarf) throughout the fuel system, not only on the high-pressure side. In that case the entire circuit - fuel tank, in-tank (low-pressure) electric feed pump, supply and return lines, fuel filter and housing, high-pressure pump, common rail, rail-pressure sensor, fuel metering unit and injectors - must be inspected and decontaminated, and any component that cannot be reliably and completely cleaned (typically the in-tank electric fuel pump, the rail-pressure sensor, the fuel metering unit and, in most cases, the injectors) must be replaced rather than reused. Otherwise the new pump can fail again quickly.

Does the pump have to be coded to the control unit after fitting? No. From the control unit's point of view the pump is a mechanical assembly, so there is no injector-style coding step. After installation the fuel system is primed and bled, and the rail pressure is checked with diagnostic equipment.

Is the inlet metering unit included? The pump is supplied complete as shown in the photographs, with the metering unit fitted. The metering unit is also available separately under 1462C00998, which replaces the earlier number 0928400757, when diagnostics point to the valve rather than to the pump itself.

Why does the box look oversized for the pump? Bosch ships the CP4 in a carton with a protective inlay to keep the drive shaft, the sealing surfaces and the high-pressure ports undamaged in transit, so the 40 x 30 x 30 cm box is normal for a pump of this weight.

Do you ship worldwide? Yes, we ship worldwide.

Common symptoms of a failing CP4 injection pump

On the Cummins QSB4.5 and QSB6.7 diesel engines, a worn or failing CP4 high-pressure pump typically presents as extended cranking or a no-start condition, an engine that starts and then stalls shortly afterwards, reduced power under load, unstable or low rail pressure with corresponding low-rail-pressure diagnostic trouble codes, and, in the advanced stages of internal wear, metallic particles in the fuel filter. Because these symptoms overlap with injector, fuel metering unit, rail-pressure sensor and low-pressure fuel supply faults, the complete fuel system must be diagnostically tested before the pump is replaced, to confirm the pump is the actual cause of the fault.

If the pump has failed internally and generated metallic debris (swarf), cleaning the high-pressure circuit alone is not sufficient. The entire fuel system must be inspected and decontaminated from the tank through to the injectors inclusive - fuel tank, in-tank (low-pressure) electric feed pump, all supply and return lines, the fuel filter and its housing, the high-pressure pump, the common rail, the rail-pressure sensor, the fuel metering unit and the injectors. Any component that cannot be reliably and completely cleaned - typically the in-tank electric fuel pump, the rail-pressure sensor, the fuel metering unit and, in most cases, the injectors - must be replaced rather than reused. Installing a new CP4 pump into a system that still contains metallic contamination is the most common cause of an immediate repeat failure.

Before installation

Before the new pump is fitted, the fuel supply system must be checked for contamination. Rust, water, sludge or varnish-like deposits, metallic debris or any other contaminant left in the tank, supply and return lines, filter housing or rail will damage the new pump within a short service period, and that damage is not covered by the warranty. Inspect and decontaminate the system, renew the filters and confirm that the fuel is clean before installation.