John Deere 4045 / 6068 — Flushing and Refilling Cooling System

Maintenance

For the John Deere 4045 / 6068, from the John Deere owner's manual.

Applies to: John Deere 4045, John Deere 6068

Procedure

1. Pressure test entire cooling system and pressure cap if not previously done.
2. Slowly open filler/radiator cap to relieve pressure and allow coolant to drain faster.
3. Open engine block drain valve on left side; drain all coolant.
4. Open radiator drain valve; drain all coolant.
5. Remove thermostats if not already done; install cover without thermostats and tighten cap screws to 47 N.m (35 lb-ft).
6. Close all drain valves after coolant has drained.
7. Fill cooling system with clean water; run engine about 10 minutes.
8. Stop engine, pull off lower radiator hose and remove radiator cap; drain water immediately.
9. Close drain valves, reinstall radiator cap and hose; fill with clean water and heavy duty cooling system cleaner.
10. Drain cleaner and fill with water to flush; run engine about 10 minutes then drain.
11. Close all drain valves; reinstall radiator hose and tighten clamps; install thermostats with new gasket.
12. Add coolant to radiator until coolant touches bottom of filler neck; install radiator cap.
13. Run engine until operating temperature; check coolant level and entire system for leaks.
14. Inspect fan belt for wear and check belt tension.

Full service-parts list: John Deere 4045 →, John Deere 6068 →

Source: John Deere owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

More John Deere repair guides →