Bosch CP5N High-Pressure Fuel Pump – Navistar MaxxForce 11 & 13 (0445020126 / 3005275C1)

For service managers and diesel technicians working on International's heavy-haul platforms, the fuel system is the single most critical variable separating uptime from a costly roadside event. At the center of that system sits the Bosch 0445020126 high-pressure fuel pump, carrying the Navistar engineering code 3005275C1, purpose-built for the MaxxForce 11.0L and 13.0L big-bore engines. This CP5N-series rotary pump translates mechanical crankshaft torque into the extreme hydraulic pressure needed to keep the common rail charged and injectors firing on schedule-mile after mile, load after load. Whether you are refreshing a ProStar after an injector failure or proactively overhauling a WorkStar before peak season, this pump delivers the OEM-specified flow and timing that aftermarket alternatives often fail to replicate.

The 0445020126 operates as a mechanically governed radial-piston pump with a distribution head that meters fuel precisely to the rail. Its core casting, 3005275C1, confirms compatibility with the MaxxForce 11 and 13 fuel architecture. The unit directly cross-references with Navistar service numbers 5010750R92, 5010750R93, 5010750R95, and the Bosch aftermarket index 0986437506 and F-00N-210-280. Technicians should note that the CP5N variant uses a specific plunger stroke and control-valve calibration distinct from earlier CP3 designs, so verifying the full 14-digit Bosch barcode against the old pump is essential before ordering. The pump's drive gear interface and mounting flange dimensions match all 2008–2016 MaxxForce castings, eliminating the need for adapter kits or modified fuel lines during a straight swap.

This pump sees daily service in some of the most punishing vocational and over-the-road environments. It is a direct fit for the International ProStar and LoneStar highway tractors-the backbone of many regional fleets-as well as the WorkStar and TranStar series (7600 and 8600 model codes) used in dump, mixer, and heavy-haul configurations. The CP5N pump also appears in certain IC Bus chassis equipped with MaxxForce 13 engines, though the primary aftermarket demand remains with Class 8 truck operators. For a shop floor, having one SKU that covers the 2009 7600 and the 2015 ProStar reduces inventory complexity while ensuring the repair bay is never waiting on a different pump for a common engine family.

Cleanliness is the difference between a successful replacement and a repeat failure. Before unboxing the new 3005275C1, drain the primary and secondary fuel filters and inspect for metallic particles-any visible glitter almost always means the injectors and rail require flushing or replacement. When installing, lubricate the pump drive gear with clean engine oil and verify the gear backlash falls within Navistar's specified tolerance (0.10–0.20 mm). Do not rely on the starter motor to prime the system; instead, use the chassis-mounted hand primer to charge the low-pressure circuit until fuel flows clear from the return line. Once mounted, a diagnostic scan tool must reset the fuel rail pressure offset and clear any learned quantity-adjustment values stored in the ECM. Failure to perform this recalibration often results in rough idle or derate conditions, even with a brand-new pump.

The CP5N pump is a high-precision hydraulic component, and its service life directly correlates with fuel-quality discipline and filter maintenance. Water intrusion is the fastest path to plunger scoring, while air ingestion causes cavitation that erodes the control-valve seats. Replacing a worn 0445020126 before it sheds debris protects the rail-mounted pressure sensors and injector nozzle assemblies, which typically cost more than the pump itself. Bosch's remanufacturing process for this unit includes 100% end-of-line testing with calibrated test benches, ensuring delivery rates match new-production specifications. For the repair shop, this translates to fewer comebacks and predictable parts margins, especially when paired with a new fuel-filter kit and a rail-pressure test as part of the service ticket.

Q1: How do I distinguish the CP5N pump from visually similar Bosch pumps used on other engine brands?
Check the casting number 3005275C1 and the Bosch index F-00N-210-280. The CP5N has a distinctive fuel inlet fitting orientation and a control-valve connector that differs from CP3 or CP4 units, making visual identification straightforward once the pump is removed from the gear housing.

Q2: Can I install this pump if the engine has a known injector cup leak or injector return-line issue?
It is strongly recommended to resolve all injector-related faults before installing a new pump. An injector that hangs open or leaks internally will cause rail-pressure instability, which forces the new CP5N's control valve to over-compensate, accelerating wear on the replacement unit.

Q3: What is the typical bench-test procedure if we suspect the pump is under-performing but not failed outright?
Certified diesel fuel-injection shops run the pump on a Bosch EPS test stand, measuring delivery volume at cranking speed and rated engine RPM. They compare actual output against the flow curve specified for the 0 445 020 126 calibration, checking for any deviation beyond ±3% across all plunger chambers.

Q4: Are there regional fuel-quality considerations that affect this pump more than others?
Yes. Operations in colder climates often see higher water content in bulk storage tanks, which increases the risk of internal corrosion. Seasonal fuel blends with lower lubricity also stress the CP5N plungers. Using a quality fuel additive with lubricity improver and installing a water-separating filter are cost-effective countermeasures.

Q5: Does the pump require a specific gear-train timing procedure, or is it keyed?
The drive gear is indexed to the pump shaft with a keyway, so it cannot be installed out of time. However, the gear lash must be measured and adjusted using the eccentric mounting bolts on the gear housing to prevent excessive wear on the pump's internal bearings.

Q6: What warranty coverage should we expect from a remanufactured unit, and what voids it?
Most reputable suppliers offer 12 to 24 months of coverage against material and workmanship defects. Voids typically include evidence of water contamination, ingestion of debris from a prior component failure, or disassembly of the pump by anyone other than an authorized Bosch service center.

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