This is a new, genuine Kubota common-rail fuel rail assembly, part number 1J600-50603. Kubota names it RAIL,ASSY V5009, and Kubota’s own parts lists for the V5009 show it in the common rail group, one per engine. The V5009 is the four-cylinder of Kubota’s 09 Series: 5.0 liters, turbocharged and aftercooled, with a common rail fuel system. Kubota’s spec sheet for the V5009-TIE5 shows an EPA Tier 4 and EU Stage V engine with DOC, DPF and SCR aftertreatment. This number replaces the earlier rail 1J600-50602.

A rail is usually replaced when a sealing seat at a pipe connection is damaged, when a rail pressure fault is traced to the rail itself, or after metal from a failed supply pump has gone through the fuel system. Kubota’s parts list for the V5009 shows the rail as one assembly and gives no separate part number for a rail pressure sensor or a relief valve. Rail pressure fault codes also come from the supply pump, the filters, the wiring and leaking injectors, so test before you order. The V5009 is an industrial engine fitted by equipment makers, so order by the engine serial number rather than by the machine.

Specifications

Fits / Applications

• Kubota V5009 (09 Series) four-cylinder common-rail diesel, 5.0 liter
• One rail per engine
• Replaces rail 1J600-50602
• Confirm by engine model, engine serial number and old part number

Common-rail parts have to go together clean. Let the engine sit stopped before you open a high-pressure connection, and cap every pipe end and rail port the moment it is open. Kubota’s parts list shows the injection pipes, the overflow pipe with its connecting bolt and gasket, and the two rail mounting bolts as separate parts, so check yours and replace any with a damaged seat or thread. Tighten the injection pipe nuts and rail bolts to the values in the Kubota 09 Series workshop manual for your engine. Bleed the low-pressure side as the engine manual describes, then clear stored codes.

Part Numbers & Cross Reference

Kubota 1J600-50603  ·  Kubota (superseded) 1J600-50602

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

What engine does the 1J600-50603 fit?

The Kubota V5009, the 5.0 liter four-cylinder common-rail diesel of Kubota’s 09 Series. Call 530-668-0818 with the engine model and serial number and we will confirm it before you order.

Does it replace the 1J600-50602 rail?

Yes. Kubota superseded 1J600-50602 with 1J600-50603, and Kubota’s V5009 parts list shows the two numbers at the same reference with 1J600-50603 as the new-for-old part.

Does Kubota sell the rail pressure sensor on its own?

Kubota’s V5009 parts list has no separate line for a rail pressure sensor or a relief valve. It lists the rail as one assembly.

Is the 1J600-50603 new or remanufactured?

New, genuine Kubota, supplied under Kubota’s own part number.

Related Parts

• Kubota V5009 (09 Series) Common-Rail Fuel Injector Kit | Genuine Kubota 1J600-53073
• Kubota V5009 (09 Series) Engine EGR Valve Assembly, 24V Build | Genuine Kubota 1J602-62700
• Kubota V3800 Common Rail Assembly 1J508-50602 (Genuine)
• Kubota V3307-CR Common Rail Assembly 1J770-50604 (Genuine)

Why Buy From Valley Fuel Injection

We are an authorized Kubota dealer and a diesel fuel-injection shop in Woodland, CA, working on diesel engines since 1993. When you call, you talk to people who know Kubota engines, and we check the part number against your engine serial or machine model before anything ships, so the right part arrives the first time. See our Kubota engine sales, parts and service.