Komatsu WA470-6 2006, Operation & Maintenance Manual

Page: 68 / 392

2.4 Precautions for maintenance Safety
2-40
WA470-6H – VEAM946100
Precautions with high-pressure oil
The hydraulic system is always under internal pressure. In addi-
tion, the fuel piping is also under internal pressure when the
engine is running and immediately after the engine is stopped.
When carrying out inspection or replacement of the piping or
hoses, check that the internal pressure in the circuit has been
released. If this is not done, it may lead to serious personal
injury. Always do as follows.
!
When carrying out inspection and maintenance of the pres-
sure, release the pressure before starting. For details, see
"Maintenance with engine running (2-35)". Do not carry out
inspection or replacement work with the circuit under pres-
sure.
!
If there is any leakage from the piping or hoses, the sur-
rounding area will be wet, so check for cracks in the piping
and hoses and for swelling in the hoses.
When carry out inspection, wear safety glasses and leather
gloves.
!
There is a hazard that high-pressure oil leaking from small
holes may penetrate your skin or cause blindness if it con-
tacts your eyes directly. If you are hit by a jet of high-pres-
sure oil and suffer injury to your skin or eyes, wash the place
with clean water, and consult a doctor immediately for medi-
cal attention.
!
The pressure in the E.C.S.S. circuit is stored by an accumu-
lator. Do not remove the E.C.S.S. piping or components.
If it is necessary to remove them, please ask your
KOMATSU distributor to carry out the removal operation.
Precautions for high-pressure fuel
High pressure is generated inside the engine fuel piping when
the engine is running. When carrying out inspection or mainte-
nance of the fuel piping system, wait for at least 30 seconds
after stopping the engine to let the internal pressure go down
before starting inspection or maintenance.
Precautions for high voltage
When the engine is running or immediately after it has stopped,
high voltage is generated at the injector terminal and inside the
engine controller, so there is danger of electrocution. Never
touch the injector terminal or the inside of the engine controller.
If it is necessary to touch the injector terminal or the inside of the
engine controller, please contact your KOMATSU distributor.
GK032082
GK043102