Operation - Section 32 OM3223
Page 32-18 Operator Cab and Controls
INDICATOR LIGHT SYMBOLS
Indicator Lights which are amber in color alert the
operator that the indicated truck function requires
some precaution when lighted.
Indicator Lights which are red in color alert the opera-
tor that the indicated truck function requires immedi-
ate 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 32-12 and the descriptions below for
explanations of the symbols. Location of the symbols
is described by rows (A-E) and columns (1 - 8).
A1. High Hydraulic Oil Temper-
ature
This warning light indicates high
oil temperature in the hydraulic
tank. Continued operation could
damage components in the
hydraulic system. Notify mainte-
nance personnel immediately.
The light turns on at 107° C (225° F).
B1. Low Steering Pressure
When the key switch is turned
ON, the low steering pressure
warning light will illuminate until
the steering system hydraulic
pressure reaches 14.7 MPa
(2100 psi). The warning buzzer
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 the
steering system hydraulic pressure drops below 14.7
MPa (2100 psi).
• If the light illuminates momentarily (flickers) while
turning the steering wheel at low truck speed and
low engine rpm, this may be considered normal,
and truck operation may continue.
• If the indicator light illuminates at higher truck
speed and high engine rpm, do not operate the
truck.
If the low steering warning light continues to illu-
minate and the alarm continues to sound, low
steering pressure is indicated. The remaining
pressure in the accumulators allows the operator
to control the truck to a stop. Do not attempt fur-
ther operation until the malfunction is located
and corrected.
C1. Low Accumulator Precharge Pressure
The low accumulator precharge
warning light, if illuminated, indi-
cates low nitrogen precharge for
the steering accumulator(s). To
check for proper accumulator
nitrogen precharge, the engine
must be stopped and the hydrau-
lic system completely bled down.
Then, turn the key switch to the RUN position. The
warning light will not illuminate if the system is prop-
erly charged. The warning light will flash if the nitro-
gen precharge within the accumulator(s) is below
7585 ± 310 kPa (1100 ± 45 psi).
If the low accumulator precharge warning light
flashes, notify maintenance personnel. Do not
attempt further operation until the accumulators
have been recharged with nitrogen to 9653 kPa
(1400 psi). Sufficient energy for emergency steer-
ing may not be available if the system is not
properly charged.
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