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Iseki TU1400-TU1601: Engine Oil and Coolant

Iseki TU1400-TU1601: Engine Oil and Coolant

The Mitsubishi K3 engines in the Iseki TU series are simple, solid units — but as with any diesel, using the right fluid at the right time makes the difference between 5,000 and 15,000 trouble-free operating hours. The overview below applies to both the 00 series (TU1400/1500/1600) and the 01 series (TU1401/1501/1601): the specifications are identical.

Suitable for the entire series: Iseki TU1400, TU1400F, TU1500, TU1500F, TU1600, TU1600F, TU1401, TU1401F, TU1501, TU1501F, TU1601, TU1601F.

Engine Oil

Capacity 3 liters
Viscosity SAE 10W-30
Quality Grade CC or higher (modern 15W-40 CF/CF-4 oil is, in practice, a great and widely used alternative)
Change Interval Every 100 operating hours (after the initial 50-hour break-in period)

Always check the engine oil with the tractor on level ground, with the engine off, and after letting it sit for at least 3 minutes so the oil can drain back into the sump.

Transmission (Mission) Oil

Capacity 12 liters
Specification Gear oil #80, GL-4 or higher
Change Interval Every 300 operating hours (after the initial 50 hours)

Front Axle Oil (4WD versions only)

Capacity 2.5 liters
Specification Gear oil #80 or #90

Coolant

Capacity 4.7 liters
Specification Clean water mixed with long-life antifreeze/coolant (LLC)
Change Interval Fully replace every 2 years

Always use an LLC (long-life coolant) — this prevents limescale buildup and corrosion in the cast-iron block and protects the water pump seal. A water pump leaking at the "weep hole" (drain hole at the bottom of the pump) indicates a worn shaft seal; a grinding or scraping noise indicates a worn bearing. Both are reasons to replace the pump before the engine overheats.

Fuel

Tank Capacity 16.5 liters
Specification Diesel fuel JIS 2 (summer) or JIS 3 (severe frost)

On tractors that have been idle for a long time, old, contaminated diesel is one of the most common causes of hard starting. Replace the fuel and fuel filter if the tractor has been sitting for more than a year, and then carefully bleed the fuel system.

Handy: we have a set of engine oil filter + 15W-40 engine oil in stock, and individual engine oil filters for when you use your own oil.

Iseki TU1400-TU1601: All Specifications per Model
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Iseki TU1400-TU1601: maintenance schedule and adjustment values
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