Komatsu 830E-AC Shop Manual page 54

These danger plates are mounted on the outside of
each frame rail to alert technicians to read the warn-
ing labels attached to the side of each of the accumu-
lators (see below) prior to releasing internal nitrogen
pressure or disconnecting any hydraulic lines or
hardware. There are similar decals mounted on top
of each of the accumulators (both steering and
brake) with the same danger message.
This danger plate is attached to all four suspensions.
The plate contains instructions for releasing internal
pressure before disconnecting any hardware.
Serious injury can occur if these directions are not
followed.
A plate on the side of the hydraulic tank furnishes
instructions for filling the hydraulic tank.
Keep the system open to the atmosphere only as
long as absolutely necessary to lessen the chances
of system contamination. Service the tank with clean
Type C-4 hydraulic oil. All oil being put into the
hydraulic tank must be filtered using filters rated at
three microns.
A caution decal is attached below the hydraulic tank
oil level sight gauge. Check level with body down,
engine stopped, and key switch OFF. Add oil per fill-
ing instructions, if oil level is below top of sight glass.
A4-4 Warnings and Cautions A04059