This is a new, genuine Kubota 1J800-53730 injection pipe. It is the high-pressure line from the common rail to the No. 3 cylinder injector on Kubota’s D1803-CR 3-cylinder and V2403-CR 4-cylinder common-rail engines. Kubota counts cylinders from the gear case end, so on the 3-cylinder D1803-CR this is the last cylinder, and on the V2403-CR it is the third of four. Kubota parts catalogs list it on L3301, L3302, L3560, L3901, L3902, L4060, L47, L4701, L4760, L4802, L5060, L5460 and L6060 tractors, MX4800, MX5200, MX5400, MX5800 and MX6000 tractors, the M5660SUH, M5660SUHD and M62, the KX040-4 and U48-5 excavators, and the R430 wheel loader.

Each cylinder has its own pipe shape. Kubota uses 1J800-53710 for No. 1, 1J800-53720 for No. 2 and 1J800-53730 for No. 3, and 4-cylinder V2403-CR engines add 1J800-53740 for No. 4. The pipe from the supply pump to the rail is a different part, 1J801-53750. Replace a pipe if it leaks at a fitting, has been kinked or bent out of shape, or has a damaged seat or nut.

Specifications

Fits / Applications

• Kubota D1803-CR 3-cylinder common-rail engines
• Kubota V2403-CR 4-cylinder common-rail engines
• Kubota L-series tractors: L3301, L3302, L3560, L3901, L3902, L4060, L47, L4701, L4760, L4802, L5060, L5460, L6060
• Kubota MX-series tractors: MX4800, MX5200, MX5400, MX5800, MX6000
• Kubota M5660SUH, M5660SUHD and M62
• Kubota KX040-4 and U48-5 excavators, R430 wheel loader

This is a high-pressure common-rail line. Work clean: cap the rail outlet and the injector inlet as soon as the old pipe is off, and keep the caps on the new pipe until it goes in. Refit the pipe clamps in their original places. Tighten the nuts to the value in the Kubota workshop manual, then check for leaks with the engine running and keep hands clear of any leak.

Part Numbers & Cross Reference

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

Which cylinder does Kubota 1J800-53730 feed on a D1803-CR versus a V2403-CR?

Kubota counts cylinders from the gear case end. On the 3-cylinder D1803-CR this pipe feeds the last cylinder, and on the 4-cylinder V2403-CR it feeds the third of four. Both engines share this pipe.

Will 1J800-53730 fit a KX040-4 or U48-5 excavator?

Yes, Kubota parts catalogs list it on the KX040-4 and U48-5 excavators and the R430 wheel loader. It is also listed on the L-series and MX-series tractors named on this page and on the M5660SUH, M5660SUHD and M62.

What are the part numbers for the other injection pipes on these engines?

Kubota uses 1J800-53710 for cylinder 1 and 1J800-53720 for cylinder 2, and 4-cylinder V2403-CR engines add 1J800-53740 for cylinder 4. The pipe from the supply pump to the rail is a different part, 1J801-53750.

When should a common-rail injection pipe like 1J800-53730 be replaced?

Replace it if it leaks at a fitting, has been kinked or bent out of shape, or has a damaged seat or nut. This one is new and genuine Kubota, sold outright with no core charge.

Related Parts

• Kubota D1803-CR & V2403-CR No. 1 Cylinder Common-Rail Injection Pipe | Genuine Kubota 1J800-53710
• Kubota D1803-CR & V2403-CR No. 2 Cylinder Common-Rail Injection Pipe | Genuine Kubota 1J800-53720
• Kubota D1803-CR & V2403-CR Common-Rail Fuel Injector | Bosch 0445110777 New (Kubota 1J801-53052)
• Kubota V2403-CR 4-Cylinder Injector Overflow Return Tube Assembly | Genuine Kubota 1J800-42500

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 can help you match the part number to your engine serial or machine model before you order. See our Kubota engine sales, parts and service.