John Deere — PTO driveline is stopped before making adjustments,

A John Deere service procedure — check it applies to your exact model before use.

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Procedure

1. 4.5 L and 6.8 L Level 14 Electronic Fuel System
2. 4.5 L and 6.8 L Level 14 Electronic Fuel System
3. 4.5 L and 6.8 L Level 14 Electronic Fuel System
4. 4.5 L and 6.8 L Level 14 Electronic Fuel System
5. 4.5 L and 6.8 L Level 14 Electronic Fuel System
6. 4.5 L and 6.8 L Level 14 Electronic Fuel System
7. 4.5 L and 6.8 L Level 14 Electronic Fuel System
8. 1. Filling batteries in a well-ventilated area.
9. 2. Wearing eye protection and rubber gloves.
10. 3. Avoiding breathing fumes when electrolyte is
11. 4. Avoiding spilling or dripping electrolyte.
12. 5. Using proper jump start procedure.
13. 1. Flush your skin with water.
14. 2. Apply baking soda or lime to help neutralize
15. 3. Flush your eyes with water for 15—30
16. 1. Do not induce vomiting.
17. 2. Drink large amounts of water or milk, but do
18. 3. Get medical attention immediately.
19. 4.5 L and 6.8 L Level 14 Electronic Fuel System
20. 4.5 L and 6.8 L Level 14 Electronic Fuel System

Source: manual:ctm320.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.