Overview – DOSER PUMP 5303018D Series
Built to Cummins specifications, the DOSER PUMP 5303018D serves Cummins SCR / DEF aftertreatment systems (Tier 4 / Stage IV); the cross-referenced series below covers the most common substitutions.
Parts Characteristics
A DEF metering (doser) pump with a pressurised delivery section and an integrated heater. It draws from the DEF tank, primes the line and meters fluid to the dosing injector under closed-loop control.
Applicable Models & Applications
Fitted to Cummins EPA Tier 4 / EU Stage IV aftertreatment on excavators and generators. The 5303018FR series reference is the common reman/alternate for the same application.
Maintenance & Replacement
Watch the aftertreatment system closely. Look for DEF crystallisation at the lines and injector, pressure faults, and heater fault codes, and check for leaks during every service. Monitor pump performance through the ECM and keep the DEF tank filled.
Symptoms that the doser pump is failing include crystallisation at the dosing line, pressure or heater DTCs, an engine derate, poor NOx conversion, and unusual pump noise. An aftertreatment fault can derate the engine and cut power until it is fixed.
To replace, relieve DEF pressure and purge the system first. Disconnect the electrical and fluid lines – catch the DEF, which is corrosive and freezes – remove the pump, and install the new unit with a fresh delivery line. Prime and purge through a scan tool, verify line pressures, and clear the fault codes.
Never let the DEF tank run dry, as that shortens pump life, and always purge before installation. Confirm the application from your ECM code – 5303018FR is the common reman alternate – and handle DEF carefully.
Price Reference (USD)
The DOSER PUMP 5303018D generally falls in the USD 220-680 bracket, with expedited freight quoted separately.
Value & Service
Aftertreatment faults can derate an engine; we supply tested doser pumps, confirm the application from your ECM code, and ship fast so the derate clears quickly.
Related interchange numbers for the DOSER PUMP: 5303018FR – confirm the exact variant against your model’s parts book before ordering.
With Racer Machinery, the DOSER PUMP 5303018D comes with fitment confidence and a warranty you can actually use, not a grey-market guess.
