John Deere 8120T / 8220T / 8320T / 8420T / 8520T service schedule

1. Stop the engine and take the key out.
2. Open the filter covers and remove the elements, wearing a dust mask.
3. Clean reusable filters as the handbook says, or fit new ones the right way round.
4. Check the covers seal.

Tools: Screwdriver, Dust mask

1. Warm the engine, then park on level ground, lower the linkage, loader and any implement, stop the engine, take the key out and chock the wheels.
2. Let it stand a few minutes. Hot oil burns, so wear gloves.
3. Remove the sump plug and let the oil drain fully.
4. Remove the filter, check the old seal came off with it, and wipe the filter head clean.
5. Oil the new filter seal and fit the filter hand-tight as marked on it.
6. Refit the plug and fill with Plus-50 II to the full mark (21.5 L on the 8120T up to 31.5 L on the 8520T).
7. Run the engine for a minute, check for leaks, stop it and recheck the level. Take the old oil to a proper disposal point.

Tools: Drain tray (30 L), Filter wrench, Spanner or socket for the sump plug, Funnel, Gloves, Rags

1. Stop the engine, take the key out and chock the wheels. Keep naked flames away.
2. Clean around the filters before opening anything.
3. Drain any water from the separator into a container.
4. Remove the old filters and fit the new ones with clean seals. Where there are two, change both together.
5. Bleed or prime the system as your handbook describes.
6. Start the engine and check for leaks.

Tools: Container for fuel, Filter wrench, Rags, Gloves

1. Park on level ground, lower the linkage, loader and any implement, stop the engine, take the key out and chock the wheels.
2. With the engine off, work the spool and linkage controls to relieve hydraulic pressure.
3. Let hot oil cool before starting; it burns.
4. Clean around each filter, remove it and catch the oil.
5. Fit the new filters with oiled seals.
6. Run the engine briefly, stop, check for leaks and top up with Hy-Gard to the mark.

Tools: Drain tray, Filter wrench, Rags, Gloves

1. Stop the engine.
2. Remove the vent filter, clean it and refit, or replace it when due.

Tools: Rags

1. Stop the engine and take the key out. Never run the engine with the filter out.
2. Open the housing and take out the primary element. Leave the secondary element in place unless it is due.
3. Wipe the housing out with a damp cloth. Do not blow dirt down the intake.
4. Fit the new element, check it seats evenly and close the housing. When the secondary is due, remove the primary first, change the secondary at once, then refit the primary.

Tools: Torch, Damp cloth

1. Park on level ground, lower the linkage, loader and any implement, stop the engine, take the key out and chock the wheels.
2. With the engine off, work the spool and linkage controls to relieve hydraulic pressure.
3. Let hot oil cool for a while, then drain it from the drain plugs.
4. Refit the plugs and fit the new filters.
5. Fill with Hy-Gard, run the engine, work the hydraulics through their full travel, lower everything and recheck the level.

Tools: Large drain tray (100 L or more), Spanners, Filter wrench, Pump or funnel, Gloves

1. Only work on a cold engine. Open the cap slowly to let pressure out.
2. Drain the radiator and block into a tray. Dispose of old coolant properly.
3. Refit the plugs and fill with Cool-Gard II.
4. Run the engine to working temperature with the heater on, let it cool and top up.

Tools: Drain tray, Hose, Coolant test strips