Komatsu 830E-AC Shop Manual page 53

A warning plate is mounted on top of the radiator
surge tank cover near the radiator cap. The engine
cooling system is pressurized. Always turn the key
switch OFF and allow the engine to cool before
removing the radiator cap. Unless the pressure is
first released, removing the radiator cap after the
engine has been operating for a time will result in the
hot coolant being expelled from the radiator. Serious
scalding and burning may result.
Warning plates are mounted on the frame in front of,
and to the rear, of both front tires. All personnel are
warned that the clearances change when the truck is
steered and could cause serious injury.
Warning plates are attached to both the hydraulic
tank and fuel tank to alert technicians not to work on
the truck with the body in the raised position unless
the body-up retention device (pins or cable) is in
position.
A04059 Warnings and Cautions A4-3