Komatsu 930E-2, Shop Manual

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STATUS / WARNING INDICATOR LIGHT SYMBOLS
AMBER (Yellow) color indicator lights alert the opera-
tor that the indicated truck function requires some
precaution when lighted.
RED color indicator lights alert the operator that the
indicated truck function requires immediate action by
the operator. Safely stop the truck and shut down the
engine.
DO NOT OPERATE THE TRUCK WITH A RED
WARNING LIGHT ILLUMINATED.
Refer to Figure 5-6 and the descriptions below for
explanations of the symbols.
Location of the symbols is described by rows (A-E) and
columns (1 - 6).
A1. NOT USED
Not currently used. Reserved for future use or options.
B1. Low Steering Pressure
When the keyswitch is turned “ON”, the low steering
pressure warning light will illuminate until the steering
system hydraulic pressure reaches 2100 psi (14.7
MPa). The warning horn will also turn on, and both will
remain on, until the accumulator has been charged.
During truck operation, the low steering pressure
warning light and warning horn will turn sound if steer-
ing system hydraulic pressure drops below 2100 psi
(14.7 MPa).
••••
If the light illuminates momentarily (“flickers”)
while turning the steering wheel at low truck
speed and low engine RPM, this may be consid-
ered “normal”, and truck operation may continue.
••••
If the indicator light illuminates at higher truck
speed and high engine RPM, DO NOT OPER-
ATE TRUCK.
If the low steering
warning light con-
tinues to illuminate
and the alarm con-
tinues to sound, low steering pressure is indi-
cated. The remaining pressure in the accumula-
tors allows the operator to control the truck to a
stop. Do not attempt further operation until the
malfunction is located and corrected.
C1. Low Accumulator Precharge Pressure
The low accumulator precharge warning light, if illumi-
nated, indicates low nitrogen precharge for the steer-
ing accumulator(s). To check for proper accumulator
nitrogen precharge, engine must be stopped and hy-
draulic system completely bled down; then turn
keyswitch to “Run” position. Warning light will NOT
illuminate if system is properly charged. The warning
light will flash if the nitrogen precharge within the
accumulator(s) is below 1100
±
45 psi (7585
±
310
kPa).
If low accumulator
precharge warning
light flashes, notify
maintenance per-
sonnel. Do not attempt further operation until the
accumulators have been recharged with nitrogen
to 1400 psi (9653 kPa). Sufficient energy for emer-
gency steering may not be available, if system is
not properly charged.
D1. NOT USED
Not currently used. Reserved for future use or options.
E1. Low Brake Pressure
This red indicator light indicates a malfunction within
the hydraulic brake circuit. If this light comes on and
buzzer sounds, shut down truck operation and
notify maintenance personnel.
NOTE: Adequate hydraulic fluid is stored to allow the
operator to safely stop the truck.
A1 Not Used
B1 Low Steering Pressure RED
C1
Low Accumulator
Precharge Pressure
RED
D1 Not Used
E1 Low Brake Pressure RED
N5-20 Operator Cab Controls N05044