The Kubota GM73 coolant capacity is listed as 1.59 gal (6 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 GM73 Coolant Capacity
| Cooling system capacity | 1.59 gal (6 L) |
|---|---|
| Radiator capacity | 1.65 gal (6.2 L) |
| Coolant type | ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible |
| Antifreeze mix | 50/50 coolant and water mix |
| Engine displacement | 3.3 L (202.5 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine displacement comparison
Kubota GM73 Coolant and Engine Notes
| Coolant capacity note | The Kubota GM73 coolant spec points to 1.59 gal (6 L). Do not rely on the radiator-only amount if the full cooling-system capacity is available |
|---|---|
| Radiator capacity note | For the Kubota GM73, the captured radiator capacity is 1.65 gal (6.2 L). If you are doing a full drain, check the full cooling-system capacity too |
| Coolant type note | Use the right coolant formula for the Kubota GM73: ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible. Cheap wrong coolant is not a smart saving if it causes corrosion or deposits |
| Antifreeze mix note | For the Kubota GM73, 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 |
| Engine context note | Engine context for the Kubota GM73: displacement 3.3 L (202.5 cu in). Engine size helps explain why coolant capacity changes between models |
| Refill note | Coolant changes are simple but easy to do sloppily. On the Kubota GM73, plan around 1.59 gal (6 L) and confirm the final level after air works out of the system |
Kubota GM73 Coolant Capacity FAQ
What is the cooling system capacity of the Kubota GM73?
The Kubota GM73 cooling system capacity is shown as 1.59 gal (6 L). That is the number to use before draining the system.
What coolant type should I use in the Kubota GM73?
Use ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible. The blunt rule is simple: match the manual’s coolant spec and do not mix unknown coolant formulas.
Should I use straight water in the Kubota GM73?
Not for normal long-term use. The Kubota GM73 should use 50/50 coolant and water mix or the manual’s specified coolant mix so the system gets corrosion, freeze and boil protection.
Does old coolant matter in the Kubota GM73?
Yes. Old coolant can lose protection even if temperature looks normal. The listed service interval for the Kubota GM73 is the service interval in the operator manual.
Why does the Kubota GM73 coolant amount differ from other models?
Coolant capacity changes with engine and radiator setup. For the Kubota GM73, the supporting engine data is displacement 3.3 L (202.5 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.
