John Deere — Flushing and Refilling Cooling System
Maintenance
From a John Deere owner's manual covering: 4045TF120, 6068HF158, 6068TF120, 6068TF250. Check it applies to your exact model before use.
Applies to: John Deere 4045TF120, John Deere 6068TF120, John Deere 6068TF250
Before you start
- Do not run engine longer than 10 minutes during cleaning.
- Air must be expelled from cooling system when system is refilled.
Procedure
- Pressure test entire cooling system and pressure cap.
- Slowly open filler cap to relieve pressure and allow coolant to drain faster.
- Open engine block drain valve; drain all coolant from engine block.
- Open radiator drain valve and drain all coolant from radiator.
- Remove thermostats; install cover using old gasket, tighten cap screws to 47 N·m (35 lb-ft).
- Close all drain valves after coolant has drained.
- Fill with clean water, run engine about 10 minutes, then drain system.
- Fill with clean water and heavy duty cleaner, drain, flush, install thermostats, add coolant.
Specs & values
- 4.5 L Engine coolant capacity: 8.5 L (9 qt)
- 6.8 L Engine coolant capacity: 11.3 L (12 qt)
Full service-parts list: John Deere 6068TF250 →
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.