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The cargo bed descended during
repair work under a dump truck bed
|[Circumstances of Incident]
This accident occurred when the driver of a dump truck was carrying out
repair work for clutch failure under the cargo bed. The driver was caught
between the arm that lifts the cargo bed and the truck body.
On the way back to the company after the
completion of transportation work on the day of the accident, the clutch of the
dump truck failed and the driver conducted repair work with the help of two
fellow drivers who were contacted via radio.
Although the driver first replenished oil
in the empty crankcase, the clutch still failed to operate.
The driver then lifted the cargo bed and entered between the cargo bed
and the truck body to release air by following the advice of a colleague,
and loosened the screw of a clutch booster by a monkey wrench to release
the air. The colleague pressed the clutch some dozen times from the driver's
seat to release the air. Despite these efforts, the clutch could not be
At this time the cargo bed descended, and
the driver was killed by being caught between the arm lifting the cargo bed and
the truck body.
The following can be considered as the
causes of this accident.
- Because of the fear of touching an
electric line above the dump truck, the driver stopped lifting the cargo bed at
an angle of elevation of about 25 degrees.
- Although a colleague advised lifting
of the cargo bed further as there was still room before the cargo bed touched
the electric line and the driver operated the lever to do so, the cargo bed
failed to ascend because of operating trouble.
- Safety measures such as using a safety
block were not taken.
- The time frame when the accident occurred was not suitable for the inspection
of a vehicle as it was after sunset and there wasn't enough light.
|[Number of victims]