294180-0100 — Feed Pump Rotor / Gear Set (Denso HP3 / HP4 Series)

Engine cores live and die by tiny moving parts. The 294180-0100 feed pump rotor (gear) set is the precision rotating assembly that drives oil/fuel transfer inside Denso HP3/HP4 feed (transfer) pumps. When worn or damaged, the rotor reduces transfer efficiency, causes slow pressure build, and accelerates wear on delivery components - replacing the rotor is often the fastest, most cost-effective way to restore pump function and avoid a full-unit exchange.

 

 

The rotor/gear set is the machined rotating element that moves low-pressure fuel through the feed pump to the high-pressure pumping elements. It must maintain concentricity, correct tooth profile and minimal run-out to preserve flow consistency under varied temperatures and contamination levels. 294180-0100 is listed by multiple suppliers as the OEM or direct-fit replacement for HP3/HP4 feed pumps.

 

 

Part number: 294180-0100 (also shown in vendor catalogs as 1 468 374 020-family cross references).

Application: Denso HP3 / HP4 series feed/transfer pumps (cross-check pump tag 294000-#### for exact fit).

Material & finish: Case-hardened steel with precision grinding for tooth profile and journal surfaces (vendor-dependent QC). 

Packaging / condition: Available as genuine OEM, OEM-equivalent, and aftermarket new units; lead times and warranty vary by supplier.

 

 

This rotor is commonly used in HP3/HP4 pump applications across light commercial, agricultural and construction engines - examples include some Toyota, Kubota and other regional platforms that use Denso HP pumps. Because multiple pump variants exist, always verify the pump's stamped part number or serial before ordering.

 

 

Restores transfer efficiency: Correct rotor geometry returns proper low-pressure feed and prevents cavitation at the high-pressure stage.

Reduces wear on downstream delivery parts: Stable feed flow reduces pulsation and protects delivery valves, plungers and seals.

Cost-effective repair: Replacing the rotor is significantly cheaper and faster than sourcing a full pump assembly when the housing and internals are serviceable.

 

 

Inspect pump housing first: measure bore and journal roundness; reject cores with scoring or ovality - a new rotor in a damaged housing will fail quickly. 

Clean assembly environment: use particle-controlled benches and lint-free tools - microscopic contamination is the leading cause of early failure.

Light assembly lubrication: use recommended assembly lubricant on journals during fitment to avoid dry start damage.

Run a bench test: validate feed flow and run-out on a calibrated test bench before reinstalling the pump. Record flow sheets for traceability.

 

 

Slow or inconsistent pressure build during cranking.

Loud whine or unusual gearbox noise from the pump area.

Rapid wear of delivery valves or increased injector return flow after otherwise normal operation.
If you see these symptoms and the pump housing checks within service limits, a rotor swap is a high-probability fix.

 

 

Choose the 294180-0100 rotor/gear set when the pump housing is serviceable but transfer efficiency or pump noise indicates a worn rotating element. For remanufacturers, fleet depots and pro workshops this part is an economical, fast-turn repair item - confirm pump tag, demand QC evidence, and bench-test after fitment to guarantee lasting results.

 

 

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