Komatsu D155A-6 Operation & Maintenance Manual page 115

EXPLANATION OF COMPONENTS
CIRCUIT BREAKER FOR MAIN POWER SUPPLY
If the starting motor is not actuated when the starting motor is
turned ON, open the battery cover inspection window at the rear
left of the machine and inspect circuit breakers (A) and (B).
(A) and (B) also act as the reset button.
If there is a surge of current, the circuit breaker shuts off the
circuit to protect the electrical components and wiring from
damage.
Turn the starting switch to the OFF position and reset the circuit breaker.
When resetting the electrical circuit after it has been shut off, press the reset button 5 to 10 minutes after the circuit
has been shut off. When the electrical circuit has been shut off, the operation of the reset button is heavier than
when the circuit is normal. The height of the reset button is the same, regardless of whether the circuit has been
shut off or has been reset, so make note of the effort of the reset button when resetting the circuit.
Do not keep the circuit breaker reset button longer than necessary.
If the starting motor does not work even when the circuit breaker has been reset, contact your Komatsu
distributor.
REMARK
The capacity of circuit breakers (A) and (B) is as follows.
(A): 30A (for regular cab power supply)
(B): 105A (for general power supply)
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OPERATION