The Kubota KL37Z coolant capacity is listed as 2.17 gal (8.2 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 KL37Z Coolant Capacity
| Coolant capacity | 2.17 gal (8.2 L) |
|---|---|
| Cooling system capacity | 2.17 gal (8.2 L) |
| Coolant type | ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible |
| Antifreeze mix | 50/50 coolant and water mix |
| Engine model | D1803 |
| Engine horsepower | 37.5 hp (28 kW) |
| Engine displacement | 2.2 L (134.3 cu in) |
Coolant Capacity Comparison Chart
Coolant capacity comparison
Engine horsepower comparison
Engine displacement comparison
Kubota KL37Z Coolant and Engine Notes
| Coolant capacity note | For service planning, the Kubota KL37Z should be treated as 2.17 gal (8.2 L) coolant capacity. That is a compact tractor cooling system where a normal premixed coolant jug may cover most of the refill |
|---|---|
| Coolant type note | Coolant type for the Kubota KL37Z is listed as ethylene glycol-based coolant, Kubota Genuine Coolant, and ASTM D3306 compatible. The safest move is to use coolant that matches the manual’s spec rather than mixing random formulas |
| Antifreeze mix note | For the Kubota KL37Z, 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 KL37Z: engine model D1803, engine horsepower 37.5 hp (28 kW), and displacement 2.2 L (134.3 cu in). Engine size helps explain why coolant capacity changes between models |
| Refill note | When refilling the Kubota KL37Z, use 2.17 gal (8.2 L) as the planning number and 50/50 coolant and water mix as the mixture guide. Recheck the level after the thermostat opens |
Kubota KL37Z Coolant Capacity FAQ
What is the cooling system capacity of the Kubota KL37Z?
The Kubota KL37Z cooling system capacity is shown as 2.17 gal (8.2 L). That is the number to use before draining the system.
What coolant type should I use in the Kubota KL37Z?
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 KL37Z?
Not for normal long-term use. The Kubota KL37Z 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 KL37Z?
Yes. Old coolant can lose protection even if temperature looks normal. The listed service interval for the Kubota KL37Z is the service interval in the operator manual.
Why does the Kubota KL37Z coolant amount differ from other models?
Coolant capacity changes with engine and radiator setup. For the Kubota KL37Z, the supporting engine data is engine model D1803, horsepower 37.5 hp (28 kW), and displacement 2.2 L (134.3 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.
