Kubota Ride-on grass cutting machines

Coolant capacity & service interval

Kubota ride-on grass cutting machines require coolant with a capacity range of 0,25 to 2,35 liters. The service interval for coolant is 12 months. The data covers 9 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
G18HD
  • Use: Normal
  • Capacity 2,1 liter
  • Capacity 0,25 liter (Recovery tank)
G2160
  • Use: Normal
  • Capacity 2,35 liter
  • Change 12 months
G21HD
  • Use: Normal
  • Capacity 0,25 liter (Recovery tank)
  • Capacity 2,1 liter (System)
  • Change 12 months
G21LD
  • Use: Normal
  • Capacity 0,25 liter (Recovery tank)
  • Capacity 2,1 liter (System)
  • Change 12 months
GR1600 II
  • Use: Normal
  • Capacity 1,9 liter (System)
  • Change 12 months
GR1600EC
  • Use: Normal
  • Capacity 2,15 liter (System)
  • Change 12 months
GR1600EC2
  • Use: Normal
  • Capacity 2,15 liter (System)
  • Change 12 months
GR2100 II
  • Use: Normal
  • Capacity 2,35 liter (System)
  • Change 12 months
GR2100EC
  • Use: Normal
  • Capacity 2,35 liter (System)
  • Change 12 months

Additional Notes

  • The Kubota G18HD cooling system holds 2.1 liters in the main circuit, with a separate 0.25-liter recovery tank. The recovery tank is a reservoir that captures coolant displaced by thermal expansion, keeping the main circuit full without fluid loss to the environment.
  • The G21HD and G21LD share identical cooling system specifications: a 2.1-liter system capacity, a 0.25-liter recovery tank, and a 12-month change interval. The presence of a recovery tank on both models distinguishes them from several other models in the range where no recovery tank capacity is listed.
  • The G2160 and GR2100 series models share a 2.35-liter system capacity, the largest cooling system volume across all listed models. The GR2100 II and GR2100EC both carry this same 2.35-liter figure alongside the 12-month change interval.
  • The GR1600 II carries the smallest listed system capacity at 1.9 liters, while the GR1600EC and GR1600EC2 both specify 2.15 liters. The 0.25-liter difference between the GR1600 II and the EC variants reflects a measurable distinction between those engine or system configurations.
  • The GR1600EC and GR1600EC2 are specified with identical cooling system capacities of 2.15 liters and the same 12-month change interval, indicating no cooling system differences between those two variants.
  • A 12-month coolant change interval is specified across the G2160, G21HD, G21LD, GR1600 II, GR1600EC, GR1600EC2, GR2100 II, and GR2100EC. A calendar-based interval of this type means the fluid is replaced annually regardless of hours operated, which is common for small liquid-cooled engines subject to seasonal use patterns.

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