John Deere Tractor 9120

Check Transmission, Hydraulic, and Axle Oil Levels

Replace Primary and Secondary Fuel Filters

Check Transmission, Hydraulic, and Axle Oil Levels

Start tractor engine and warm transmission/axle oil to 30° C (86° F).

After oil is at correct temperature, drive to a level surface, shift transmission to Park and set engine speed at 2100 rpm.

Let tractor run for a minimum of 5 minutes at 2100 rpm without applying brakes.

After 5 minutes reduce engine speed to 1200 rpm.

Check Axle End Play (Normal Use)

Drain, Flush, and Refill Engine Cooling System

Remove de-aeration tank cap (A) slowly and when engine is cool

For tractors equipped with Automatic Temperature Control (ATC), turn key to Run. Turn ATC controls to ON; ATC indicator must show ”HI”

Remove three cap screws (B), then remove panel (C) beneath radiator drain valve

Open radiator drain valve and drain coolant into catch pan through drain hose (D)

Open engine drain valve (E) and drain coolant into catch pan

For 9.0 L engine, remove EGR cooler vent plug (A)

Oil Fill Vari-Cool Fan Drive and Driven Sheaves-For Tier 3 and Stage III B Engine

Cleaning Optional Fuel Water Separator Filter Element (If Equipped)

Open drain valve and drain fuel from bowl.

Remove cap screws (A) and lid (B).

Lift out filter element by the handle (D).

Wash filter in clean diesel fuel or mineral spirits.

Inspect filter for damage. If damage, replace with new filter.

Change Transmission/Axle, and Hydraulic Oil

Remove plug (A) and drain transmission

Remove plug (B) and clean sump screen

Reinstall sump screen and plug (B)

Drain both axles (three plugs on each axle) (C) and (D)

Drain PTO drop box, if equipped

Replace transmission oil filter