This is a new, genuine Kubota water pump assembly, part number 1A021-73036. Kubota engine dealers list it for the D1803, V2203 and V2403 diesels, and Kubota’s parts description calls it the high mount pump with a 2.62 inch impeller. Kubota dealer parts catalogs show it on L, MX and M series tractors, including the L3240, L3830, L4240, L4740 and L5030, the MX5000 and MX5100, and the M4030SU, M4700, M4800SU, M5400 and M5700. It replaces 1A021-73035, 1A021-73033, 1A021-73030 and 16412-73030.

Do not confuse it with 1G928-73035, the high mount pump on later tractors such as the L3560, L4060, L4701 and MX5400, or with 1A051-73036, the low mount pump on the KX121-3, KX161-3 and U35 excavators. The same engine model can carry a different pump depending on the machine it was built for. 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 1A021-73430, is a separate part number, so order it with the pump.

Specifications

Fits / Applications

• Kubota V2203 and V2403 diesel engines
• Kubota D1803 diesel engine
• Kubota L3240, L3830, L4240, L4740 and L5030 tractors
• Kubota MX5000 and MX5100 tractors
• Kubota M4030SU, M4700, M4800SU, M5400 and M5700 tractors
• Direct replacement for a pump numbered 1A021-73035, 1A021-73033, 1A021-73030 or 16412-73030

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 1A021-73430 (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Kubota 1A021-73036  ·  Kubota (superseded) 1A021-73035  ·  Kubota (superseded) 1A021-73033  ·  Kubota (superseded) 1A021-73030  ·  Kubota (superseded) 16412-73030

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 1A021-73036 fit my Kubota L4240 or MX5100?

Yes. Kubota dealer parts catalogs show 1A021-73036 as the water pump on the L3240, L4240 and L4740 and on the MX5000 and MX5100. Some tractors have a serial number break, so call 530-668-0818 with your serial number if you are not sure.

What is the difference between 1A021-73036 and 1A051-73036?

Kubota describes 1A021-73036 as the high mount pump and 1A051-73036 as the low mount pump, both with a 2.62 inch impeller. They take different gaskets, 1A021-73430 and 1A051-73430, and they are listed for different machines.

What numbers does 1A021-73036 replace?

It replaces 1A021-73035, 1A021-73033, 1A021-73030 and 16412-73030. If your old pump carries one of those numbers, this is the current part.

Is it new or remanufactured?

New, genuine Kubota.

Related Parts

• Kubota D1503, D1703, D1803, V2003, V2203 & V2403 Engine Stop Solenoid | Genuine Kubota 1A021-60017
• Kubota V2203 & V2403 (03 Series) Starter Motor, 12V 2.0 kW | Genuine Kubota 1K371-63010
• Kubota L3200, L3400, L3800, L4600, MX5100 & M5140 Mechanical Fuel Lift Pump | Genuine Kubota 1G896-52030
• Kubota L-Series, M4700, M5400, KX121-2 & KX161-2 Alternator, 12V 40A | Genuine Kubota 5H937-42700

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.