Testing Engine Speed - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02625-06

Testing engine speed

a Measure the engine speed with the monitoring
function of the machine monitor.
a Measure the engine speed under the following
condition.
Engine coolant temperature: Within operat-
q
ing range
q Hydraulic oil temperature: Within operating
range
1.
Preparation work
Operate the machine monitor so that the engine
speed can be monitored.
a For the operating method of the machine
monitor, see "Special functions of machine
monitor".
a Monitoring code: 01002 Engine speed
2.
Measuring low idle speed
1) Start the engine and set the fuel control dial
to the low idle (MIN) position.
2) Set all the control levers and pedals for work
equipment, swing and travel to the neutral
and measure the engine speed.
8
3.
Measuring high idle speed
1) Start the engine and set the fuel control dial
to the high idle (MAX) position.
2) Set the working mode in the power mode (P)
and turn the auto-decelerator OFF.
3) Set all the control levers and pedals for work
equipment, swing and travel to the neutral
and measure the engine speed.
4.
Measuring the engine speed when 2-pumps are
relieved
1) Start the engine and move the arm cylinder to
the IN stroke end.
2) Set the fuel control dial in the high idle (MAX)
position and set the working mode in the
power mode (P).
3) Operate the left work equipment control lever
to relieve the arm circuit at the IN stroke end
and measure the engine speed.
5. Measuring the engine speed when 2-pumps
relief and power maximizing (near rated
speed)
1) Start the engine and move the arm cylinder to
the IN stroke end.
2) Set the fuel control dial in the high idle (MAX)
position and set the working mode in the
power mode (P).
3) While operating the left work equipment
control lever to relieve the arm at the IN
stroke end and depressing the power maxi-
mizing switch, measure the engine speed.
a The power maximizing function is reset
automatically in about 8.5 seconds even if
the switch is being depressed. Thus mea-
surement of the engine speed must be
completed within that period.
6.
Measuring the speed when auto-deceleration
speed is in operation
1) Start the engine, set the fuel control dial in
the high idle position (MAX), and turn the
auto-decelerator ON.
2) Set all the control levers and pedals for work
equipment, swing and travel to neutral and
measure the engine speed when the
auto-decelerator is operated.
a The engine speed is slowed down to a
certain level in about 5 seconds from set-
ting all the control levers and pedals to the
neutral. This level is the engine speed
when operation of the auto-deceleration
is turned on.
30 Testing and adjusting
PC300, 350-8