Caterpillar — Cooling System Coolant Level - Check
Maintenance
From a Caterpillar owner's manual covering: 3408C, 3412, 3412C. Check it applies to your exact model before use.
Applies to: Caterpillar 3408C, Caterpillar 3412, Caterpillar 3412C
Before you start
- Pressurized System: Hot coolant can cause serious burns.
- Stop the engine and wait until cooling system components are cool.
Procedure
- Observe coolant level in recovery tank; maintain to COLD FULL mark.
- Loosen filler cap slowly to relieve pressure; remove the filler cap.
- Pour proper coolant mixture into tank; do not fill above COLD FULL.
- Clean filler cap and receptacle; reinstall; inspect system for leaks.
- Without a recovery tank, maintain level within 13 mm of filler pipe bottom.
- Clean and inspect filler cap gaskets; replace damaged cap.
Tools required
- 9S-8140 Pressurized Pump Group (filler cap pressure test) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Coolant level within 13 mm (0.5 inch) of the bottom of the filler pipe
Full service-parts list: Caterpillar 3408C →, Caterpillar 3412 →, Caterpillar 3412C →
Source: Caterpillar 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.