Jacobsen Rotary ride-on mowers

Coolant capacity & service interval

Jacobsen Rotary ride-on mowers use coolant with a capacity range of 2,85 to 6,8 liters. Service intervals include checks at 8 and 10 hours, and changes at 1000 hours or 12 months. The data covers 3 configurations.

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

TypeSpecifications
AR3, AR30001/2/3
  • Use: Normal
  • Capacity 5,2-6,8 liter
  • Check 10 hours
  • Change 1000 hours/ 12 months
TR3, TR30001/2
  • Use: Normal
  • Capacity 5,2-6,8 liter
  • Check 10 hours
  • Change 1000 hours/ 12 months
Tri-King, 67718, 67733, 67749, 67750, 67721, 64742, 67726, 67748
  • Use: Normal
  • Capacity 2,85 liter
  • Check 8 hours
  • Change 12 months

Additional Notes

  • The AR3 and AR30001/2/3 cooling systems hold between 5.2 and 6.8 liters of coolant, a range that reflects variation across the individual model configurations within that group rather than a single fixed fill volume.
  • The TR3 and TR30001/2 share the identical 5.2–6.8 liter capacity range and the same check and change intervals as the AR3 series, indicating a common cooling system architecture between the two model families.
  • The Jacobsen Tri-King models — including variants 67718, 67733, 67749, 67750, 67721, 64742, 67726, and 67748 — carry a fixed cooling system capacity of 2.85 liters, a notably smaller volume compared to the AR3 and TR3 groups.
  • The AR3 and TR3 series require a coolant level check every 10 operating hours under normal use conditions, while the Tri-King group calls for a more frequent check interval of every 8 hours under the same conditions.
  • Coolant changes for the AR3 and TR3 series are due at 1,000 operating hours or 12 months, whichever comes first under normal use, combining both a time-based and an hours-based threshold in a single service trigger.
  • The Tri-King cooling system change interval is set at 12 months under normal use conditions, with no operating-hour threshold listed alongside it, making calendar time the sole driver of that service event.