Caterpillar 3406 — Add Cooling System Conditioner
Maintenance
For the Caterpillar 3406, from the Caterpillar operator's manual.
Applies to: Caterpillar 3406
Before you start
- At Operating Temperature, engine coolant is hot and under pressure.
- Steam can cause personal injury.
- Cooling System Conditioner contains alkali. Avoid contact with skin and eyes to prevent personal injury.
- Do not use Caterpillar Cooling System Conditioner with Dowtherm 209 coolant.
Procedure
- The truck must be level, the parking brake applied, and the engine stopped.
- On a new or reconditioned engine: add enough Caterpillar Cooling System Conditioner, or equivalent, so that the cooling system will have a 3% to 6% concentration of conditioner. Add 1 pint (.50 liters
- Every 12,500 Miles or 250 Service Hours thereafter: add 1 pint (.50 liters) for each 16 gal. (60.50 liters) of coolant in the system to maintain the required 3% concentration.
- Loosen the radiator cap slowly to relieve pressure, and remove radiator cap.
- Add Caterpillar Cooling System Conditioner.
- Inspect the radiator cap gaskets. Replace the cap if the gaskets are damaged.
- Install the radiator cap.
Specs & values
- 3% to 6% concentration on new or reconditioned engine.
- 1 pint (.50 liters) for each 4 gal. (15.14 liters) of coolant to obtain 3% concentration.
- Every 12,500 miles or 250 service hours: 1 pint (.50 liters) for each 16 gal. (60.50 liters) of coolant.
Full service-parts list: Caterpillar 3406 →
Source: Caterpillar operator'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.