Function To Control Pump During Travel; Travel Speed Change Function - Komatsu PC210-8 Shop Manual

10 Structure, function and maintenance standard
1)

Function to control pump during travel

For details, see Engine and pump composite
q
control function.
2)

Travel speed change function

1] Manual change with travel speed
selector switch
Switching the travel speed selector
switch from Lo to Mi and Hi causes
the pump controller to control the
pump capacity and motor capacity at
each gear speed as shown below,
switching the travel speed.
Lo (Low
Travel speed switch
speed)
Pump capacity (%)
Motor capacity
Travel speed (km/h)
2] Automatic change by engine speed
If you adjust the engine speed to
1,500 rpm or less with the fuel control
dial,
The travel speed does not switch
q
to Hi when the machine is travel-
ling in Mi.
The travel speed automatically
q
changes to Mi when the machine
is travelling in Hi.
3] Automatic change by pump discharge
pressure
If the travel pressure is kept to 24.5
MPa {250 kg/cm
due to increased load during travel-
ling in Hi on an uphill, the travel motor
capacity automatically switches to the
medium speed (Mi) (the travel speed
switch stays at Hi).
If the machine starts travelling on
level ground or downhill during opera-
tion of the above mentioned function
and the travel pressure goes below
14.7 MPa {150 kg/cm
such the condition at least 0.5 sec.,
the travel motor capacity will automat-
ically change, switching the travel
speed switch to Hi again.
PC210, 230, 240-8
Mi
Hi (High
(Medium
speed)
speed)
80 90 100
Max. Max. Min.
3.0 4.1 5.5
2
} at least 0.5 sec.
2
} and continues
UEN00103-03
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