The Kubota B2630 coolant capacity is listed as 1.66 gal (6.3 L). It also lists coolant type ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible and antifreeze mix 50/50 coolant and water mix.
Kubota B2630 Coolant Capacity
| Coolant capacity | 1.65 gal (6.2 L) |
|---|---|
| Cooling system capacity | 1.66 gal (6.3 L) |
| Coolant type | ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible |
| Antifreeze mix | 50/50 coolant and water mix |
| Coolant change interval | every 700 hours |
| Engine model | D1803 |
| Engine horsepower | 26.5 hp (19.8 kW) |
| Engine displacement | 1.1 L (68.5 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Engine displacement comparison
Kubota B2630 Coolant and Engine Notes
| Coolant capacity note | The Kubota B2630 coolant spec points to 1.66 gal (6.3 L). Do not rely on the radiator-only amount if the full cooling-system capacity is available |
|---|---|
| Coolant type note | For the Kubota B2630, coolant type matters as much as capacity. The clean captured value is ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible |
| Antifreeze mix note | For the Kubota B2630, the captured mix is 50/50 coolant and water mix. Straight water is not the right long-term answer unless you are only flushing the system |
| Coolant change interval note | Coolant service for the Kubota B2630 is listed as every 700 hours. If the service history is unknown, a fresh drain and refill is usually the cleaner move |
| Engine context note | Engine context for the Kubota B2630: engine model D1803, engine horsepower 26.5 hp (19.8 kW), and displacement 1.1 L (68.5 cu in). Engine size helps explain why coolant capacity changes between models |
| Refill note | The practical service move for the Kubota B2630: buy enough coolant for 1.66 gal (6.3 L), fill to spec, run the engine, then recheck the radiator and overflow bottle after cooling |
Kubota B2630 Coolant Capacity FAQ
How much coolant does the Kubota B2630 take?
The main coolant amount captured for the Kubota B2630 is 1.66 gal (6.3 L). Buy a little extra so you can top up after the engine warms up and cools down.
Does coolant type matter on the Kubota B2630?
Yes. Capacity tells you how much to buy; coolant type tells you what to buy. For the Kubota B2630, the captured coolant type is ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible.
What antifreeze mix does the Kubota B2630 use?
The captured antifreeze mix for the Kubota B2630 is 50/50 coolant and water mix. A 50/50-style mix is the common practical answer unless your manual or climate calls for something different.
When should the Kubota B2630 coolant be replaced?
Use every 700 hours as the service guide. Coolant can look okay but still lose corrosion protection over time.
Why does the Kubota B2630 coolant amount differ from other models?
Coolant capacity changes with engine and radiator setup. For the Kubota B2630, the supporting engine data is engine model D1803, horsepower 26.5 hp (19.8 kW), and displacement 1.1 L (68.5 cu in).
Mistakes do happen. Tractor coolant specs can change by year, market, engine, radiator, cab/heater setup and service procedure. Please check the operator manual, decal information and official kubotausa.com website for official information before draining or refilling the cooling system.
