DRIVE GP-FLEXIBLE COUPLING 6P3985 - Caterpillar

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Stop the engine and allow the engine to cool. Loosen expansion tank filler cap (1) slowly in order to relieve any pressure. Remove the expansion tank filler cap.
Open the cooling system drain valve (if equipped).
Remove the following plugs so the coolant may be totally drained:
Remove plug (2) in order to vent the water near the water temperature regulator.
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Remove drain plug (3) from the bottom heat exchanger.
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Remove drain plug (4) from the bottom of the water cooled exhaust manifold.
Remove drain plugs (5) from the bottom of the jacket water pump inlet.
Remove drain plug (6) from the bottom of the oil cooler.
Allow coolant to drain.
Dispose of used engine coolant properly or recycle. Various methods have been proposed to reclaim used coolant for reuse in engine cooling systems. The full distillation procedure is the only method acceptable by Caterpillar to reclaim the used coolant.
For information regarding the disposal and the recycling of used coolant, consult your Caterpillar dealer or consult Caterpillar Service Technology Group:Outside Illinois 1-800-542-TOOL
Inside Illinois 1-800-541-TOOL
Canada 1-800-523-TOOL
Flush
Use of commercially available cooling system cleaners may cause damage to cooling system components. Use only cooling system cleaners that are approved for Caterpillar engines.
Flush the cooling system with clean water in order to remove any debris.
Close the drain valve (if equipped). Clean the drain plugs. Reinstall the drain plugs. Refer to the Operation and Maintenance Manual for more information on the proper torques.
Fill the cooling system no faster than 19 L (5 US gal) per minute to avoid air locks.
Fill the cooling system with a mixture of clean water and Caterpillar Fast Acting Cooling System Cleaner. Add 0.5 L (1 pint) of cleaner per 15 L (4 US gal) of the cooling system capacity. Install the expansion tank filler cap.
Start the engine