Iseki TD

Coolant capacity & service interval

Iseki TD uses coolant with a capacity of 10 liters. Service intervals occur every 400 hours or 12 months. The data covers 2 configurations.

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

Type	Specifications
TD 4411 TE, FE (1986-1992)	Use: Normal Capacity 10 liter Change 400 hours/ 12 months
TD 4451 TE, FE (1986-1992)	Use: Normal Capacity 10 liter Change 400 hours/ 12 months

The Iseki TD 4411 and TD 4451 each carry a cooling system capacity of 10 liters, a figure that reflects the total volume of the entire cooling circuit rather than a partial top-up amount.
Both the TE and FE variants of the TD 4411 share the same 10-liter capacity, indicating no difference in cooling system volume between those two trim designations within that model.
The TD 4451 TE and FE variants also hold 10 liters, matching the TD 4411 exactly despite being a distinct model, which points to a shared cooling system architecture across both models in the 1986-1992 period.
The coolant change interval for both models under normal use conditions is set at 400 hours or 12 months, whichever comes first, meaning either threshold alone is sufficient to trigger a service.
The 400-hour mark is a time-in-operation figure, making interval tracking dependent on an hour meter reading rather than distance traveled, which is standard practice for agricultural and industrial machinery.
The 12-month calendar limit runs alongside the hourly interval, so a machine with low annual operating hours would still require a coolant change within a year under normal use conditions.