Kubota 1J574-50504 High-Pressure Supply Pump for V3800 Common-Rail Engines

The Kubota 1J574-50504 (Kubota catalog description: ASSY PUMP,SUPPLY) is the genuine Denso-built high-pressure common-rail supply pump for Kubota’s V3800 diesel. It is the current revision in the 1J574-50500 pump family and the component that builds rail pressure for the injectors on common-rail V3800DI-T and V3800-TI-CRS engines, found in Kubota M96S, M108S, M100X and M110X tractors. Hard starting, low rail-pressure codes, loss of power and stalling under load are the classic signs of a worn supply pump, and this genuine assembly is the factory-correct fix.

Application & Fitment

• Engines: Kubota V3800DI-T common-rail variants (often listed simply as V3800DI or V3800) and the V3800-TI-CRS common-rail turbo (2009-2014)
• Kubota M108S tractor (confirmed application)
• Kubota M96S tractor (listed for the same 1J574-505xx pump family)
• Kubota M100X / M100XDTC tractor
• Kubota M110X / M110XDTC tractor

Aftermarket references also list Japan-market M108 variants (M108DSC, M108SDS, M108SH, M108XDTC and related models). Call us to verify those against your serial number.

Important: later Tier 4 V3800-CR engines, such as those in SVL90-2 and SVL95-2s track loaders, use a different 1J500-series pump (Denso 294000-1720/1730). Those numbers do not interchange with 1J574-50504, so confirm your engine model and serial number before ordering.

Cross-Reference Part Numbers

• Denso 294000-0690, 294000-0691, 294000-0692, 294000-0693
• Kubota 1J574-50500, 1J574-50501, 1J574-50502, 1J574-50503 (earlier revisions superseded by 1J574-50504)
• Kubota KEARP-1J574 (Kubota remanufactured exchange number)

Frequently Asked Questions

Will 1J574-50504 fit my tractor?

If your machine currently runs an earlier revision (1J574-50500 through 1J574-50503) or a pump marked Denso 294000-0690 through 294000-0693, 1J574-50504 is the current genuine replacement. It serves common-rail V3800DI-T and V3800-TI-CRS engines in the M96S, M108S, M100X and M110X tractor families. Have your engine model and serial number ready and we will confirm the exact part before you buy.

Why buy a genuine Kubota pump instead of an aftermarket copy?

This is a Denso HP3-type common-rail pump running extremely tight internal clearances at injection pressure. A genuine Kubota assembly is built and calibrated to Denso and Kubota specification and carries dealer warranty support. Cheap copies of this part number are common online, and a pump that sheds metal can take the injectors and rail down with it, turning one repair into a full fuel-system job.

How do I order this pump?

Call 530-668-0818 or request a quote online. The pump is supplied to order through our Kubota dealer parts network, and we will quote current pricing, availability and lead time. If your original pump failed with debris in the fuel, ask us about testing or rebuilding the rest of your common-rail system in-house at the same time.

Why source your Kubota parts from Valley Fuel Injection

As an authorized Kubota dealer and diesel fuel-injection specialists, Valley Fuel Injection & Turbo supplies genuine Kubota engines and fuel-system components, and we rebuild the very common-rail systems these parts serve. Diesel is all we do, and we have done it across Northern California and Nevada since 1993.

Pricing & availability: this genuine Kubota high-pressure supply pump is supplied to order. Call 530-668-0818 or request a quote for current pricing, availability and lead time. Have your engine model and serial number ready so we can confirm the exact part for your machine.