This is a new, genuine Kubota water pump assembly, part number 15521-73040. Kubota engine dealers list it for the V2203 four-cylinder diesel. Kubota dealer parts catalogs show it on the KX121-2, KX161-2 S Series and KX101 excavators, the KH-60(H), KH-66-H, KH-90(H), KH-91-H, KH-101 and KH-151 excavators, the L275, L355SS, L3350DT and L4350DT tractors and the R420 wheel loader. Dealer catalogs list those machines without naming the engine in each one, so match the number on your old pump. Kubota’s parts description gives it a 2.75 inch impeller. It replaces 15521-73039, 15521-73035, 15521-73033, 15521-73030 and 15521-73410.

Later machines moved to other pumps: the KX121-3 and KX161-3 take 1A051-73036, and later L-series tractors such as the L4240 take 1A021-73036. Replace the pump when coolant weeps from the drain hole, the shaft bearing is rough or loose, or the engine runs hot with a good thermostat, radiator and fan belt. The pump gasket, Kubota 15766-73430, is a separate part number, so order it with the pump.

Specifications

Fits / Applications

• Kubota V2203 diesel engine
• Kubota KX121-2, KX161-2 S Series and KX101 excavators
• Kubota KH-60(H), KH-66-H, KH-90(H), KH-91-H, KH-101 and KH-151 excavators
• Kubota L275, L355SS, L3350DT and L4350DT tractors
• Kubota R420 wheel loader
• Direct replacement for a pump numbered 15521-73039, 15521-73035, 15521-73033, 15521-73030 or 15521-73410

Before you drain the system, set the new pump next to the old one and compare the bolt pattern, the hose connections and the height of the pulley flange. Fit a new gasket, Kubota 15766-73430 (a separate part number), on a clean mounting face. Refill with the coolant Kubota specifies for the engine, bleed the air out, then check fan belt condition and tension.

Part Numbers & Cross Reference

Kubota 15521-73040  ·  Kubota (superseded) 15521-73039  ·  Kubota (superseded) 15521-73035  ·  Kubota (superseded) 15521-73033  ·  Kubota (superseded) 15521-73030  ·  Kubota (superseded) 15521-73410

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 15521-73040 fit my Kubota KX121-2?

Yes. Kubota dealer parts catalogs show 15521-73040 as the water pump on the KX121-2, with gasket 15766-73430. The later KX121-3 takes a different pump, 1A051-73036.

What numbers does 15521-73040 replace?

It replaces 15521-73039, 15521-73035, 15521-73033, 15521-73030 and 15521-73410. If your old pump carries one of those numbers, this is the current part.

Which gasket goes with it?

Kubota lists the water pump gasket as a separate part, 15766-73430, and dealers show it as required with this pump. Order a new gasket with the pump.

Is it new or remanufactured?

New, genuine Kubota.

Related Parts

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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.