This is a new, genuine Kubota water pump assembly, part number 1E051-73036. It fits Kubota D722 and D902 three-cylinder diesel engines. Kubota lists it on BX1850D, BX1860, BX1870 and BX1880 tractors, RTV900 and RTV-X900 utility vehicles, the GR2120 garden tractor, ZD1011 and ZD1021 zero-turn mowers, and the SCL1000 standing loader. It replaces the older numbers 1E051-73030 and 1E051-73510.

Replace it when the weep hole leaks coolant, the bearing is rough or loose, or the engine runs hot with a good thermostat and radiator. The pump gasket, Kubota 16871-73430, is a separate part number, so order it with the pump.

Specifications

Fits / Applications

• Kubota D722 and D902 diesel engines
• Kubota BX1850D, BX1860, BX1870 and BX1880 tractors
• Kubota RTV900 and RTV-X900 utility vehicles
• Kubota GR2120 garden tractor
• Kubota ZD1011 and ZD1021 zero-turn mowers
• Kubota SCL1000 standing compact loader

Use a new gasket (Kubota 16871-73430, sold separately) and clean the block face. Refill and bleed the cooling system, then check fan belt condition and tension.

Part Numbers & Cross Reference

Kubota (replaced number) 1E051-73030  ·  Kubota (replaced number) 1E051-73510

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

Does water pump 1E051-73036 fit a Kubota RTV900 or RTV-X900?

Yes, Kubota lists it on RTV900 and RTV-X900 utility vehicles. It is also listed on BX1850D, BX1860, BX1870 and BX1880 tractors, the GR2120 garden tractor, ZD1011 and ZD1021 zero-turn mowers and the SCL1000 standing loader. The engines are the D722 and D902 three-cylinder diesels.

Is the gasket included with the 1E051-73036 water pump?

No. The pump gasket, Kubota 16871-73430, is a separate part number and is sold separately. Order it with the pump.

My old pump is marked 1E051-73030 or 1E051-73510. Is 1E051-73036 the replacement?

Yes. 1E051-73036 replaces both older numbers, 1E051-73030 and 1E051-73510. It is a new genuine Kubota pump, sold outright with no core charge.

How do I make sure this is the right pump for my D722 or D902?

Kubota has used more than one water pump across its Super Mini engines. Call 530-668-0818 with the engine model and serial number, or the machine model and serial number. As an authorized Kubota dealer we confirm the match at no charge before it ships.

Related Parts

• Kubota D902, D905, D1105 & V1505 Thermostat, 71°C (160°F) | Genuine Kubota 19434-73015
• Kubota D905, D1005, D1105 & V1505 Engine Water Pump | Genuine Kubota 16251-73037
• Kubota D722, D902, Z482 & Z602 Fuel Injector, Nozzle Holder Kit | Genuine Kubota 16871-53904
• Kubota D722 & D902 Injection Pump for BX, RTV-X900, GR & ZD | Genuine Kubota 16006-51012

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.