140-3 SERIES
12-13
TESTING AND ADJUSTING MEASURING OIL PRESSURE, HANDLING EQUIPMENT IN FUEL CIRCUIT
MEASURING OIL PRESSURE
1.
Remove oil pressure low-pressure switch (1) or
oil pressure high-pressure switch (2).
★ Wrap the wiring harness of the disconnected
switch with tape to prevent it from touching
the cylinder block.
2.
Fit nipple to pressure test kit
A
, then connect
to the pressure test kit.
3.
Start the engine and measure the oil pressure
when the engine is running at low idling and high
idling.
4.
After completing the measurement, remove the
measurement equipment and set to the original
condition.
3
Oil pressure switch:
2.9 – 5.9 Nm {0.3 – 0.6 kgm}
HANDLING EQUIPMENT IN
FUEL CIRCUIT
★ Precaution for inspection and maintenance of
fuel system
With the common rail type fuel injection system,
more precise equipment is used than with the
conventional fuel injection pump and nozzle, so
problems may occur if dirt or dust get in.
When carrying out installation and maintenance
of the fuel system, pay more attention than
usual to prevent dirt or dust from getting in. If
there is any dirt stuck to any part, use clean fuel
to wash it off completely.
★ Precautions when replacing fuel filter cartridge
Always use a genuine Komatsu part for the fuel
filter cartridge.
With the common rail type fuel injection system,
more precise equipment is used than with the
conventional fuel injection pump and nozzle, so
a special filter with high efficiency filtering ability
is used to prevent dirt or dust from getting in.
For this reason, if any filter is used as a substi-
tute for the genuine filter, there is danger that
problems will occur with the fuel system. To pre-
vent this, never use such filters.
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