C1. Low Accumulator Precharge Pressure; D1. Not Used; E1. Low Brake Pressure; A2. Low Hydraulic Tank Level - Komatsu 930E-4SE Operation & Maintenance Manual

OM3245 8/11
6. If safe to do so, have maintenance personnel
place wheel chocks or other mechanisms in
front or behind the wheels to reduce the risk of
the truck rolling.
7. If traffic is excessive near the disabled machine,
mark the truck with warning flags during day-
light hours or use flares at night. Adhere to local
regulations.
NOTE: If the engine is stopped, and the key switch is
OFF and the light is flashing, a malfunction has been
detected in the accumulator bleed down system,
indicating there is still hydraulic pressure in the
system. The system/component system failure light
will also be illuminated, and the warning horn will be
on. Do not operate the truck, and notify maintenance
personnel.

C1. Low Accumulator Precharge Pressure

This red warning light indicates low
nitrogen precharge for the steering
accumulator(s). To check for proper
accumulator precharge, the engine
must be stopped and the hydraulic
system must be completely
depressurized. Turn the key switch
to RUN. The warning light will not come on if the
system is properly charged. The warning light will
flash if the nitrogen precharge in the accumulator(s)
is below 7 585 ± 310 kPa (1,100 ± 45 psi).
If the low accumulator precharge warning light
flashes, notify maintenance personnel. Do not
attempt further operation until the accumulators
have been properly charged with nitrogen.
Sufficient pressure for emergency steering may
not be available if the system is not properly
charged.

D1. Not used

This light is reserved for future use
by the AC drive system.
Operator Cab And Controls - Section 32

E1. Low Brake Pressure

This red warning light indicates a
malfunction within the hydraulic
brake circuit. If this light comes on
and the warning buzzer sounds,
shut down the truck and notify
maintenance personnel. Adequate
hydraulic oil is stored to allow the
operator to safely stop the truck.

A2. Low Hydraulic Tank Level

This red warning light indicates
that the oil level in the hydraulic
tank is below the recommended
level. Damage to the hydraulic
pumps may occur if operation
continues. Shut down the truck
and notify maintenance personnel
immediately.

B2. Low Automatic Lubrication System Pressure

This amber indicator light will
illuminate if the automatic
lubrication system fails to reach
13 790 kPa (2,000 psi) at the
junction block located on the rear
axle housing within one minute
after the lube timer initiates a
cycle of grease. To turn the light off, turn key switch
OFF, then back to ON again. Notify maintenance
personnel at shift change.

C2. Circuit Breaker Tripped

This amber indicator light will
illuminate if any of the circuit
breakers in the relay circuit control
boards are tripped. The relay circuit
boards are located in the electrical
control cabinet.
NOTE: Additional circuit breakers are in the operator
cab behind the center console. However, tripping of
these circuit breakers should not activate this light.
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