John Deere Tractor 8400

Drain, Flush, and Refill Engine Cooling System

Remove access panel (A) and slowly turn the radiator cap to relieve pressure, then carefully remove cap (B)

Open radiator (C) and engine (D) drain cocks

Remove thermostat cover (E) and thermostats. Install cover without thermostats. Tighten cap screws

Close drain cocks, fill system with a commercial cooling system cleaning solution. Run engine up to operating temperature. Stop engine and drain system

Close drain cocks, fill system with clean water. Run engine up to operating temperature. Stop engine and drain system

Remove thermostat cover and clean sealing area. Apply sealant to new gasket and install thermostats and gasket. Tighten cap screws to 48 N·m (35 lb-ft)

Close drain cocks again. Fill system with the specified coolant. Run engine to circulate and mix coolant. Coolant level should be up to mark on expansion tank

Addition of coolant conditioner

Pump individually the left brake (A) and right brake (B). The pedals should have a solid feel.

Check to make sure the pedals do not settle to the end of stroke within 10 seconds after being applied.

Press both pedals simultaneously. A solid pedal should be obtained at approximately the same pedal height on both pedals.

Keep all connections (A) clean and tight. Remove corrosion, and wash terminals with a solution of baking soda and water.

Check the specific gravity of the electrolyte in each battery cell.

Check level of electrolyte in each cell (B). If low, fill to bottom of filler necks with CLEAN, SOFT water. DO NOT OVERFILL.

Change Transmission-Hydraulic Oil

Clean Transmission Filter Screen

Clean Hydraulic Oil Suction Screen

Change MFWD Hub and Axle Housing Oil

Steps to change MFWD Hub and Axle Housing Oil

Lubricate Draft Link Support Shaft Bushing

CHECK ALTERNATOR BELT TENSIONER

All air intake system joints (A) are tight?

Hose clamps at turbocharger are tight?

Pre-cleaner is clear of dirt and trash?

Engine idle speeds are within acceptable range?

Coolant conditioner added as required?

Transmission and Hydraulic Filter Elements Replacement

Drain Water Separator, if equipped

Check Transmission-Hydraulic Oil Level

Lubricate 2WD Front Wheel Bearings

Lubricate Steering Spindles/Cylinder Ends