ROD 4J8643 - Caterpillar

Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve the pressure.
Park the machine on a level surface. Ensure that the parking brake is fully engaged. Retract the ejector blade and shut off the engine. Do not perform this procedure until the coolant has fully cooled.
Illustration 1 g00832461
Remove the cap slowly in order to gradually relieve any system pressure.
Inspect the cap for damage, for foreign material, and for deposits. If the cap is damaged, replace the cap. If the cap is not damaged, clean the cap with a clean cloth.
Install the cap.