Urea Pump Assembly 5273337

BG 203016 (OE 5273337): function on the vehicle

Urea Pump Assembly 5273337 is supplied by BEST GROWTH under part number 203016, cross-referenced to OE 5273337, as a direct-fit aftermarket def pumps. In service it draws diesel exhaust fluid from the tank, builds and regulates system pressure, and returns fluid during the purge cycle. Filter condition, pressure stability and heater function drive service life.

BG 203016 is built to the position defined by its OE application in truck, agricultural machinery, construction equipment and industrial engine service on platforms from MAN, Ford, DAF, Cummins, John Deere and Komatsu. Position, calibration and connector layout are part of the specification, so a part that physically fits is not automatically the correct part.

DEF quality is the single largest driver of pump life. Fitting a new pump into a contaminated tank simply repeats the failure.

Fitment for MAN, Ford and DAF and OE cross reference

BG 203016 replaces 1 OE reference: 5273337. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 203016 includes MAN, Ford, DAF, Cummins, John Deere and Komatsu, typically on MAN / FORD/DAF/ CUMMINS ISB4.5, ISD4.5, ISB6.7, ISD6.7 John Deere Komatsu. Coverage lists are a starting point for identification, not a substitute for checking the OE number on the vehicle.

Quote the number printed on your part with the engine code when you enquire; a single-reference part is the most common source of ordering errors when a platform received a mid-life update.

Symptoms that lead to replacing 5273337

These complaints bring a vehicle in with the MAN and Ford def pumps under suspicion. None of them prove BG 203016 has failed on its own, which is why the checks below matter before a replacement is ordered.

• pressure decay immediately after the pump stops
• pressure too low or unable to build pressure
• long priming time after a tank refill
• frozen-line faults in cold-climate operation
• repeated dosing interruptions during a drive cycle

Checks before fitting BG 203016

Aftertreatment faults are usually system faults. Working through these checks prevents a repeat failure after the new def pumps is fitted.

• Check suction and pressure lines for kinks and crystallised blockage.
• Test pressure build-up time and decay against the manufacturer's limits.
• Inspect the DEF filter and tank strainer for contamination and crystallisation.
• Verify heater circuit and coolant valve operation before winter service.
• Confirm DEF concentration with a refractometer; contaminated fluid destroys the pump.

Quality, packaging and ordering 203016

BG 203016 is manufactured and tested to aftermarket replacement standards, with electrical, leakage and functional testing carried out before packing. Bulk and retail packaging, private-label cartons and customer-specific labelling are available for distributors and workshop groups.

Send OE 5273337 or the number printed on your part, the engine code and the vehicle identification number with your enquiry, and our technical team will confirm the correct reference, current stock position and lead time before you commit to an order.

Frequently asked questions

Does BG 203016 replace OE 5273337?

Yes. BG 203016 is listed against 5273337. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 203016 fit?

Recorded coverage includes MAN, Ford, DAF and Cummins. It is supplied as a direct-fit aftermarket def pumps. Adaptation, reset or relearn procedures required by the vehicle manufacturer still apply after installation.

Does this fault code always mean the def pumps has failed?

No. Exhaust leaks, wiring and connector damage, reductant quality, dosing performance and upstream engine faults can all produce the same codes. Validate those inputs before replacing BG 203016.