Iseki GEAS AT23-AT33 maintenance schedule
Iseki GEAS AT23-AT33 maintenance schedule: all intervals at a glance
The complete maintenance schedule for the Iseki GEAS AT series can be found below, exactly as Iseki specifies it in the factory manual. And because the entire range shares the same chassis, the same engine, and the same transmission, this schedule applies unchanged to every model — from AT23 to AT33N.
Suitable for the entire series: Iseki GEAS AT23, AT25, AT27, AT30, AT33, AT27N and AT33N.
Daily check (before every start)
Before each working day, take a few minutes for a quick walk-around: engine oil level, coolant level (reservoir tank), fuel, tire pressure, and any leaks under the tractor. Then check whether the brake and clutch feel normal and whether the lights and warning lamps do what they're supposed to do.
Maintenance by operating hours — engine
| Component | Task | Interval |
|---|---|---|
| Engine oil | Change | Every 100 hours |
| Engine oil filter | Replace | Every 200 hours |
| Air filter element | Clean | Every 100 hours |
| Air filter element | Replace | Every 600 hours or once a year |
| Coolant (reservoir tank) | Check/top up | Every 100 hours |
| Coolant | Change | Every 600 hours or once every 2 years |
| Radiator hoses | Check | Every 200 hours |
| Fuel filter | Clean | Every 100 hours |
| Fuel filter | Replace | Every 400 hours |
| Fan belt (V-belt) | Check tension | Every 100 hours |
| Battery (fluid level) | Check/top up | Every 100 hours or once a year |
| Engine valve clearance | Check (dealer) | Every 600 hours |
Maintenance by operating hours — transmission and chassis
| Component | Task | Interval |
|---|---|---|
| Transmission oil (gearbox) | Change | Every 200 hours |
| Transmission oil filter | Replace | Every 200 hours |
| Front axle oil | Check | Every 200 hours |
| Front axle oil | Change | Every 600 hours |
| Clutch housing (water drain) | Check | Every 100 hours |
| Clutch pedal play | Check/adjust | Every 100 hours |
| Brake pedal play | Check/adjust | Every 200 hours |
| Steering ball joint | Check (dealer) | Every 200 hours |
| Toe-in (track adjustment) | Check/adjust (dealer) | Every 200 hours |
| Tie rod end (mounting) | Inspect (dealer) | Every 200 hours |
| Front axle (fore/aft play) | Check | Every 600 hours |
| Tire pressure | Check/top up | Every 200 hours |
| Wheel bolts | Check | Every 100 hours |
| Power steering hose | Check | Every 100 hours |
| Grease points (kingpin, brake arm, tie rod ends) | Grease | Before/after every use |
Maintenance by calendar
| Component | Task | Interval |
|---|---|---|
| Electrical wiring | Check | Once a year |
| Electrical wiring | Replace (dealer) | Once every 2 years |
| Radiator (internal) | Clean | Once every 2 years |
| Power steering hose / level cylinder hose / auto-brake hose (SQ) | Replace (dealer) | Once every 2 years |
Cab version (additional maintenance)
| Component | Task | Interval |
|---|---|---|
| A/C belt | Check/adjust | Every 200 hours |
| A/C condenser | Clean | Every 200 hours |
| A/C filter | Clean | Once a month |
| A/C hoses/lines | Check | Once a year |
| Windshield washer fluid | Top up | As needed |
Tip: keep track of your operating hours
Not every AT still has a reliably working hour meter after years of use and import. So keep track of your operating hours yourself, or fit a simple hour meter, so you can actually stick to the intervals above. Only running a few hours per year? Then be sure to follow the calendar intervals — fluids and rubber hoses age even when the tractor is standing still.
