Caterpillar 3406 — Inspect Radiator Coolant Level
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.
- Check coolant level ONLY when engine is stopped and radiator cap is cool enough to touch with your hand.
- Cooling System Conditioner contains alkali. Avoid contact with skin and eyes to prevent personal injury.
Procedure
- Inspect coolant level with the engine stopped and cold.
- Remove the radiator cap slowly to relieve pressure.
- Maintain coolant level within 2 inch (1 cm) below the top of the fill pipe.
- Inspect cap gasket and replace if necessary.
- If it is necessary to add coolant daily, inspect the cooling system for leaks.
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.