.
OPERATION
EXPLANATION OF COMPONENTS
MAIN POWER CIRCUIT BREAKERS
If the starting motor is not actuated even when the starting
switch is turned to the ON position, open the battery cover at the
rear left side of the machine, and inspect circuit breakers (1) and
(2).
Circuit breakers (1) and (2) 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.
No
Fuse
capacity
Circuit
(1) 105A General power supply
(2) 30A Permanent power supply for cab
CIRCUIT BREAKER
If the starting switch does not work even when the starting
switch is turned to the ON position, open the recirculated air filter
cover to gain access to the circuit breaker.
If excessive current flows through the circuit breaker, it cuts off
the electric circuit to prevent damage to the electrical
components and wiring.
To restore the electric circuit after it has been cut off, push in
reset button (3). (This springs out when the circuit is cut off.)
If the electric circuit is normal, reset button (3) will stay pushed
in. If it comes out immediately when it is pushed in, the electric
circuit must be checked.
Circuit breakers (1) and (2) also act as reset button (3).
No
Fuse
capacity
Circuit
(1) 20A Starting switch
(2) 20A Air conditioner
REMARK
The circuit breaker is a device installed in electric circuits where a large current flows. It is installed to protect the
electric circuit. It protects the electric components and wiring from damage caused by an abnormal current in the
same way as a normal fuse. After repairing and restoring the location of the abnormality, there is no need to replace
the breaker. It can be used again.
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