This is the genuine Kubota radiator cap, part number 17580-16060. Kubota engine dealers list it for the D1105 and D1803, and Kubota’s own parts books show it on D782, Z402 and DF752 builds. Kubota tractor dealers list it for a long run of L series tractors, the MX4700, MX5000 and MX5100, M series tractors such as the M4900, M5700 and M5-111, the RTV900, the KX057-5, U48-5 and U55-5 excavators and SQ generators. The full list is below.

A cap with a hard or cracked seal will not hold pressure. The engine then loses coolant, pushes it out the overflow or runs hot under load. The cap goes with the radiator, not just the engine, and Kubota uses more than one radiator cap. Match the number on your old cap or parts list, or call us with the machine model and serial number.

Specifications

Fits / Applications

• Kubota D1105 and D1803 diesel engines
• Kubota D782 and Z402 diesel engines and the DF752 gasoline and LPG engine, on builds whose radiator takes this cap
• Kubota L2600, L2800, L3000, L3130, L3240, L3400, L3430, L3540, L3700SU, L3710, L3830 and L3940 tractors
• Kubota L4240, L4300, L4310, L4330, L4400, L4610, L4630, L4740, L5030, L5040, L5240 and L5740 tractors
• Kubota L39, L45, L48 and M59 tractor loader backhoes
• Kubota MX4700, MX5000 and MX5100 tractors
• Kubota M4800SU, M4900, M5700, M95S, M95X, M105S and M105X tractors
• Kubota M5-091, M5-111, M5L-111, M5N-091, M5N-092, M5N-111, M5N-112, M6H-101, M6L-111 and M6S-111 tractors
• Kubota RTV900 utility vehicles
• Kubota KX057-5, U48-5 and U55-5 excavators
• Kubota SQ-1140, SQ-1200, SQ-3170 and SQ-3250 generators

Never open the cap on a hot engine. Check the radiator filler neck for nicks and scale before you fit the new cap, since a damaged neck leaks even with a good cap.

Part Numbers & Cross Reference

Kubota 17580-16060

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

Will the 17580-16060 cap fit my Kubota L3400 or MX5100?

Yes. Two Kubota dealer catalogs list this cap for the L3400 and the MX5100, along with many other L, M and MX tractors.

Does it fit the RTV900?

Yes. Kubota dealer catalogs list 17580-16060 for the RTV900 models.

Which engines use this cap?

Kubota engine dealers list it for the D1105 and the D1803, and Kubota’s parts books show it on some D782, Z402 and DF752 builds. The cap goes with the radiator, so call 530-668-0818 with the engine model and serial number and we will check the parts list.

How do I know my machine takes this cap and not another one?

Kubota uses several radiator caps that look the same. Match the part number in your parts list, or give us the machine model and serial number.

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.