Komatsu Galeo PC138US-8, Shop Manual, Page: 336 / 946

SEN02458-01 30 Testing and adjusting
8
PC138US, USLC-8
Checking exhaust gas color 1
a
Checking tools for exhaust gas color
k
Stop the machine on a level ground and
lower the work equipment to the ground.
k
Be careful not to touch any hot part when
removing or installing the checking tools.
a
Check the exhaust gas color under the follow-
ing condition.
q
Engine coolant temperature: Within oper-
ating range
a
If an air source and an electric power source
are not available in the field, use handy smoke
checker
A1 . When recording official data, use
smoke meter A2 .
1. Testing with handy smoke checker A1
1) Stick a sheet of filter paper to smoke
checker
A1 .
2) Insert the exhaust gas intake pipe in
exhaust pipe (1).
3) Start the engine and accelerate it sud-
denly or run it at high idle and operate the
handle of smoke checker
A1 so that the
filter paper will absorb the exhaust gas.
a
Absorbing time: 1.4 ± 0.2 sec
4) Remove the filter paper and compare it
with the attached scale.
5) After finishing checking, remove the test-
ing tools and return the removed parts.
2. Checking with smoke meter A2
1) Insert probe [1] of smoke meter A2 in the
outlet of the exhaust pipe and fix it to the
exhaust pipe with a clip.
2) Connect the probe hose, receptacle of the
accelerator switch, and air hose to smoke
meter
A2 .
a
Limit the supplied air pressure to 1.5
MPa {15 kg/cm
2
}.
3) Connect the power cable to an AC recep-
tacle.
a
Before connecting the cable, check
that the power switch of the smoke
meter is turned OFF.
4) Loosen the cap nut of the suction pump
and fit the filter paper.
a
Fit the filter paper securely so that the
exhaust gas will not leak.
5) Turn on the power switch of smoke meter
A2 .
6) Start the engine and accelerate it sud-
denly or run it at high idle and depress the
accelerator pedal of smoke meter
A2 and
collect the exhaust gas into the filter
paper.
7) Place the contaminated filter paper on the
clean filter paper (at least 10 sheets) in the
filter paper holder and read the indicated
value.
8) After finishing checking, remove the
checking tools and return the removed
parts.
Symbol Part No. Part name
A
1 799-210-9001 Handy smoke checker
2
Commercially
available
Smoke meter