Komatsu HB365LC-3, Operation & Maintenance Manual

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Problem Main causes Remedy
Swing speed is slow. Defective swing PPC pressure sen-
sor (Replace the sensor.)
Fuel control dial is in low throttle posi-
tion. Turn the fuel control dial to High idle
(MAX) position.
The swing cannot be stopped. (*1) Failure of hybrid device (Replace the device.)
Hybrid system stop caution lamp
lights up. Hybrid system stop switch is still ap-
plied. Turn off the hybrid system stop
switch.
Defective wiring (Check and repair.)
Defective hybrid system stop switch (Replace the switch.)
Hybrid caution lamp lights up.
(No action level is displayed.) Capacitor low voltage Charge the capacitor by running the
engine at low idle.
Capacitor low voltage (Replace the capacitor.)
Hybrid temperature caution lamp
lights up. Insufficient coolant in hybrid device
cooling system Check, add coolant, repair by refer-
ring to CHECKS BEFORE START-
ING.
Accumulation of dirt and water stain
in hybrid device cooling system Change coolant, flush inside of cool-
ing system by referring to WHEN RE-
QUIRED.
Clogged hybrid device radiator fins or
damaged fin Clean or repair. See EVERY 500
HOURS MAINTENANCE.
Loose radiator filler cap Tighten the cap or replace the pack-
ing.
Improper lubrication of electric swing
motor Check oil level and add oil by refer-
ring to EVERY 1000 HOURS MAIN-
TENANCE.
Improper lubrication of electric swing
motor Check oil level and add oil by refer-
ring to EVERY 1000 HOURS MAIN-
TENANCE.
Defective monitor (Replace the monitor.)
The hybrid caution lamp lights up,
and the action levels “L04” to “L02”
light up. (*2) Defective wiring (Check and repair.)
Defective swing PPC pressure sen-
sor (Replace the sensor.)
Electric leakage in hybrid device (Replace the device.)
Excessive voltage in hybrid device (Replace the device.)
Overcurrent in hybrid device (Replace the device.)
Hybrid device is abnormally heated. (Replace the device.)
(*1):
If any problem is found in hybrid devices during the swing operation, the hybrid caution lamp and action levels
“L04” to “L02” are displayed on the machine monitor, and the swing parking brake is automatically applied to
stop the swing. In case of the following phenomenon, press the hybrid system stop switch and stop swinging;
the upper structure does not stop swinging even if the lever is returned to the neutral position or it starts swing-
ing even if nothing is operated. After the swing stops, be sure to ask your Komatsu distributor for repair.
(*2):
The electric leakage sensor, voltage sensor, current sensor and temperature sensor are installed in the hybrid
devices. The fuse is installed in the capacitor (storage battery) to protect the system when overcurrent occurs.
TROUBLES AND ACTIONS OPERATION
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